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• Karimi, S.M., Freund, M., Wager, B.M., Knoblauch, M., Fromm, J., Müller, H., Ache, P., Krischke, M., Mueller, M.J., Müller, T., Dittrich, M., Geilfus, C.-M., Alfarhan, A.H., Hedrich, R., Deeken, R. (2021) Under salt stress guard cells rewire ion transport and abscisic acid ({ABA}) signaling, New Phytologist, available: https://doi.org/10.1111/nph.17376.
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  @article{Karimi_2021, author = {Karimi, Sohail M. and Freund, Matthias and Wager, Brittney M. and Knoblauch, Michael and Fromm, Jörg and Müller, Heike and Ache, Peter and Krischke, Markus and Mueller, Martin J. and Müller, Tobias and Dittrich, Marcus and Geilfus, Christoph-Martin and Alfarhan, Ahmed H. and Hedrich, Rainer and Deeken, Rosalia}, journal = {New Phytologist}, keywords = {imported}, month = {mar}, publisher = {Wiley}, title = {Under salt stress guard cells rewire ion transport and abscisic acid ({ABA}) signaling}, year = 2021 }

  %0 Journal Article %1 Karimi_2021 %A Karimi, Sohail M. %A Freund, Matthias %A Wager, Brittney M. %A Knoblauch, Michael %A Fromm, Jörg %A Müller, Heike %A Ache, Peter %A Krischke, Markus %A Mueller, Martin J. %A Müller, Tobias %A Dittrich, Marcus %A Geilfus, Christoph-Martin %A Alfarhan, Ahmed H. %A Hedrich, Rainer %A Deeken, Rosalia %D 2021 %I Wiley %J New Phytologist %R 10.1111/nph.17376 %T Under salt stress guard cells rewire ion transport and abscisic acid ({ABA}) signaling
• Du, B., Kruse, J., Winkler, J.B., Alfarraj, S., Albasher, G., Schnitzler, J.-P., Ache, P., Hedrich, R., Rennenberg, H. (2021) Metabolic responses of date palm (Phoenix dactylifera L.) leaves to drought differ in summer and winter climate, Tree Physiology, available: https://doi.org/10.1093/treephys/tpab027.
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  @article{Du_2021, author = {Du, Baoguo and Kruse, Joerg and Winkler, Jana Barbro and Alfarraj, Saleh and Albasher, Gadah and Schnitzler, Joerg-Peter and Ache, Peter and Hedrich, Rainer and Rennenberg, Heinz}, journal = {Tree Physiology}, keywords = {myown}, month = {feb}, publisher = {Oxford University Press ({OUP})}, title = {Metabolic responses of date palm (Phoenix dactylifera L.) leaves to drought differ in summer and winter climate}, year = 2021 }

  %0 Journal Article %1 Du_2021 %A Du, Baoguo %A Kruse, Joerg %A Winkler, Jana Barbro %A Alfarraj, Saleh %A Albasher, Gadah %A Schnitzler, Joerg-Peter %A Ache, Peter %A Hedrich, Rainer %A Rennenberg, Heinz %D 2021 %I Oxford University Press ({OUP}) %J Tree Physiology %R 10.1093/treephys/tpab027 %T Metabolic responses of date palm (Phoenix dactylifera L.) leaves to drought differ in summer and winter climate
• Paoletti, E., Hoshika, Y., Arab, L., Martini, S., Cotrozzi, L., Weber, D., Ache, P., Neri, L., Baraldi, R., Pellegrini, E., Müller, H.M., Hedrich, R., Alfarraj, S., Rennenberg, H. (2021) Date palm responses to a chronic, realistic ozone exposure in a {FACE} experiment, Environmental Research, 195, 110868, available: https://doi.org/10.1016/j.envres.2021.110868.
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  @article{Paoletti_2021, author = {Paoletti, Elena and Hoshika, Yasutomo and Arab, Leila and Martini, Sofia and Cotrozzi, Lorenzo and Weber, Daniel and Ache, Peter and Neri, Luisa and Baraldi, Rita and Pellegrini, Elisa and Müller, Heike M. and Hedrich, Rainer and Alfarraj, Saleh and Rennenberg, Heinz}, journal = {Environmental Research}, keywords = {imported}, month = {apr}, pages = 110868, publisher = {Elsevier {BV}}, title = {Date palm responses to a chronic, realistic ozone exposure in a {FACE} experiment}, volume = 195, year = 2021 }

  %0 Journal Article %1 Paoletti_2021 %A Paoletti, Elena %A Hoshika, Yasutomo %A Arab, Leila %A Martini, Sofia %A Cotrozzi, Lorenzo %A Weber, Daniel %A Ache, Peter %A Neri, Luisa %A Baraldi, Rita %A Pellegrini, Elisa %A Müller, Heike M. %A Hedrich, Rainer %A Alfarraj, Saleh %A Rennenberg, Heinz %D 2021 %I Elsevier {BV} %J Environmental Research %P 110868 %R 10.1016/j.envres.2021.110868 %T Date palm responses to a chronic, realistic ozone exposure in a {FACE} experiment %V 195
• Garcia-Maquilon, I., Coego, A., Lozano-Juste, J., Messerer, M., de Ollas, C., Julian, J., Ruiz-Partida, R., Pizzio, G., Belda-Palaz{\’{o}}n, B., Gomez-Cadenas, A., Mayer, K.F.X., Geiger, D., Alquraishi, S.A., Alrefaei, A.F., Ache, P., Hedrich, R., Rodriguez, P.L. (2021) {PYL}8 {ABA} receptors of Phoenix dactylifera play a crucial role in response to abiotic stress and are stabilized by {ABA}, Journal of Experimental Botany, 72(2), 757–774, available: https://doi.org/10.1093/jxb/eraa476.
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  @article{Garcia_Maquilon_2020, author = {Garcia-Maquilon, Irene and Coego, Alberto and Lozano-Juste, Jorge and Messerer, Maxim and de Ollas, Carlos and Julian, Jose and Ruiz-Partida, Rafael and Pizzio, Gaston and Belda-Palaz{\'{o}}n, Borja and Gomez-Cadenas, Aurelio and Mayer, Klaus F X and Geiger, Dietmar and Alquraishi, Saleh A and Alrefaei, Abdulwahed F and Ache, Peter and Hedrich, Rainer and Rodriguez, Pedro L}, editor = {Jones, Matt}, journal = {Journal of Experimental Botany}, keywords = {myown}, month = {oct}, number = 2, pages = {757-774}, publisher = {Oxford University Press ({OUP})}, title = {{PYL}8 {ABA} receptors of Phoenix dactylifera play a crucial role in response to abiotic stress and are stabilized by {ABA}}, volume = 72, year = 2021 }

  %0 Journal Article %1 Garcia_Maquilon_2020 %A Garcia-Maquilon, Irene %A Coego, Alberto %A Lozano-Juste, Jorge %A Messerer, Maxim %A de Ollas, Carlos %A Julian, Jose %A Ruiz-Partida, Rafael %A Pizzio, Gaston %A Belda-Palaz{\'{o}}n, Borja %A Gomez-Cadenas, Aurelio %A Mayer, Klaus F X %A Geiger, Dietmar %A Alquraishi, Saleh A %A Alrefaei, Abdulwahed F %A Ache, Peter %A Hedrich, Rainer %A Rodriguez, Pedro L %D 2021 %E Jones, Matt %I Oxford University Press ({OUP}) %J Journal of Experimental Botany %N 2 %P 757-774 %R 10.1093/jxb/eraa476 %T {PYL}8 {ABA} receptors of Phoenix dactylifera play a crucial role in response to abiotic stress and are stabilized by {ABA} %V 72

• L{\’o}pez-Marqu{’e}s, R.L., Norrevang, A.F., Ache, P., Moog, M., Visintainer, D., Wendt, T., {O}sterberg, J.T., Dockter, C., Jorgensen, M.E., Salvador, A.T., Hedrich, R., Gao, C., Jacobsen, S.E., Shabala, S., Palmgren, M. (2020) Prospects for the accelerated improvement of the resilient crop quinoa, J Exp Bot, 71, 5333–5347, available: https://doi.org/10.1093/jxb/eraa285.
  • [ Abstract ]
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  Crops tolerant to drought and salt stress may be developed by two approaches. First, major crops may be improved by introducing genes from tolerant plants. For example, many major crops have wild relatives that are more tolerant to drought and high salinity than the cultivated crops, and, once deciphered, the underlying resilience mechanisms could be genetically manipulated to produce crops with improved tolerance. Secondly, some minor (orphan) crops cultivated in marginal areas are already drought and salt tolerant. Improving the agronomic performance of these crops may be an effective way to increase crop and food diversity, and an alternative to engineering tolerance in major crops. Quinoa (Chenopodium quinoa Willd.), a nutritious minor crop that tolerates drought and salinity better than most other crops, is an ideal candidate for both of these approaches. Although quinoa has yet to reach its potential as a fully domesticated crop, breeding efforts to improve the plant have been limited. Molecular and genetic techniques combined with traditional breeding are likely to change this picture. Here we analyse protein-coding sequences in the quinoa genome that are orthologous to domestication genes in established crops. Mutating only a limited number of such genes by targeted mutagenesis appears to be a promising route for accelerating the improvement of quinoa and generating a nutritious high-yielding crop that can meet the future demand for food production in a changing climate.

  @article{LopezMarques:2020:J-Exp-Bot:32643753, abstract = {Crops tolerant to drought and salt stress may be developed by two approaches. First, major crops may be improved by introducing genes from tolerant plants. For example, many major crops have wild relatives that are more tolerant to drought and high salinity than the cultivated crops, and, once deciphered, the underlying resilience mechanisms could be genetically manipulated to produce crops with improved tolerance. Secondly, some minor (orphan) crops cultivated in marginal areas are already drought and salt tolerant. Improving the agronomic performance of these crops may be an effective way to increase crop and food diversity, and an alternative to engineering tolerance in major crops. Quinoa (Chenopodium quinoa Willd.), a nutritious minor crop that tolerates drought and salinity better than most other crops, is an ideal candidate for both of these approaches. Although quinoa has yet to reach its potential as a fully domesticated crop, breeding efforts to improve the plant have been limited. Molecular and genetic techniques combined with traditional breeding are likely to change this picture. Here we analyse protein-coding sequences in the quinoa genome that are orthologous to domestication genes in established crops. Mutating only a limited number of such genes by targeted mutagenesis appears to be a promising route for accelerating the improvement of quinoa and generating a nutritious high-yielding crop that can meet the future demand for food production in a changing climate.}, author = {L{\'o}pez-Marqu{\'e}s, R L and Norrevang, A F and Ache, P and Moog, M and Visintainer, D and Wendt, T and {\O}sterberg, J T and Dockter, C and Jorgensen, M E and Salvador, A T and Hedrich, R and Gao, C and Jacobsen, S E and Shabala, S and Palmgren, M}, journal = {J Exp Bot}, keywords = {myown}, month = {jun}, pages = {5333-5347}, title = {Prospects for the accelerated improvement of the resilient crop quinoa}, volume = 71, year = 2020 }

  %0 Journal Article %1 LopezMarques:2020:J-Exp-Bot:32643753 %A L{\'o}pez-Marqu{'e}s, R L %A Norrevang, A F %A Ache, P %A Moog, M %A Visintainer, D %A Wendt, T %A {O}sterberg, J T %A Dockter, C %A Jorgensen, M E %A Salvador, A T %A Hedrich, R %A Gao, C %A Jacobsen, S E %A Shabala, S %A Palmgren, M %D 2020 %J J Exp Bot %P 5333-5347 %R 10.1093/jxb/eraa285 %T Prospects for the accelerated improvement of the resilient crop quinoa %U https://pubmed.ncbi.nlm.nih.gov/32643753/ %V 71 %X Crops tolerant to drought and salt stress may be developed by two approaches. First, major crops may be improved by introducing genes from tolerant plants. For example, many major crops have wild relatives that are more tolerant to drought and high salinity than the cultivated crops, and, once deciphered, the underlying resilience mechanisms could be genetically manipulated to produce crops with improved tolerance. Secondly, some minor (orphan) crops cultivated in marginal areas are already drought and salt tolerant. Improving the agronomic performance of these crops may be an effective way to increase crop and food diversity, and an alternative to engineering tolerance in major crops. Quinoa (Chenopodium quinoa Willd.), a nutritious minor crop that tolerates drought and salinity better than most other crops, is an ideal candidate for both of these approaches. Although quinoa has yet to reach its potential as a fully domesticated crop, breeding efforts to improve the plant have been limited. Molecular and genetic techniques combined with traditional breeding are likely to change this picture. Here we analyse protein-coding sequences in the quinoa genome that are orthologous to domestication genes in established crops. Mutating only a limited number of such genes by targeted mutagenesis appears to be a promising route for accelerating the improvement of quinoa and generating a nutritious high-yielding crop that can meet the future demand for food production in a changing climate.

• Du, B., Kruse, J., Winkler, J., Alfarray, S., Schnitzler, J., Ache, P., Hedrich, R., Rennenberg, H. (2019) Climate and development modulate the metabolome and anti-oxidative system of date palm leaves, J Exp Bot, 70, 5959–5969, available: https://doi.org/10.1093/jxb/erz361.
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  @article{noauthororeditor, author = {Du, B and Kruse, J and Winkler, JB and Alfarray, S and Schnitzler, JP and Ache, P and Hedrich, R and Rennenberg, H}, journal = {J Exp Bot}, keywords = {imported}, pages = {5959-5969}, title = {Climate and development modulate the metabolome and anti-oxidative system of date palm leaves}, volume = 70, year = 2019 }

  %0 Journal Article %1 noauthororeditor %A Du, B %A Kruse, J %A Winkler, JB %A Alfarray, S %A Schnitzler, JP %A Ache, P %A Hedrich, R %A Rennenberg, H %D 2019 %J J Exp Bot %P 5959-5969 %R 10.1093/jxb/erz361 %T Climate and development modulate the metabolome and anti-oxidative system of date palm leaves %U https://www.ncbi.nlm.nih.gov/pubmed/31375818 %V 70
• Dittrich, M., Mueller, H.M., Bauer, H., Peirats-Llobet, M., Rodriguez, P.L., Geilfus, C.M., Carpentier, S.C., Al Rasheid, K.A.S., Kollist, H., Merilo, E., Herrmann, J., M{"u}ller, T., Ache, P., Hetherington, A.M., Hedrich, R. (2019) The role of Arabidopsis ABA receptors from the PYR/PYL/RCAR family in stomatal acclimation and closure signal integration, Nat Plants, 5(9), 1002–1011, available: https://doi.org/10.1038/s41477-019-0490-0.
  • [ Abstract ]
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  Stomata are microscopic pores found on the surfaces of leaves that act to control CO2 uptake and water loss. By integrating information derived from endogenous signals with cues from the surrounding environment, the guard cells, which surround the pore, 'set' the stomatal aperture to suit the prevailing conditions. Much research has concentrated on understanding the rapid intracellular changes that result in immediate changes to the stomatal aperture. In this study, we look instead at how stomata acclimate to longer timescale variations in their environment. We show that the closure-inducing signals abscisic acid (ABA), increased CO2, decreased relative air humidity and darkness each access a unique gene network made up of clusters (or modules) of common cellular processes. However, within these networks some gene clusters are shared amongst all four stimuli. All stimuli modulate the expression of members of the PYR/PYL/RCAR family of ABA receptors. However, they are modulated differentially in a stimulus-specific manner. Of the six members of the PYR/PYL/RCAR family expressed in guard cells, PYL2 is sufficient for guard cell ABA-induced responses, whereas in the responses to CO2, PYL4 and PYL5 are essential. Overall, our work shows the importance of ABA as a central regulator and integrator of long-term changes in stomatal behaviour, including sensitivity, elicited by external signals. Understanding this architecture may aid in breeding crops with improved water and nutrient efficiency.

  @article{Dittrich:2019:Nat-Plants:31451795, abstract = {Stomata are microscopic pores found on the surfaces of leaves that act to control CO2 uptake and water loss. By integrating information derived from endogenous signals with cues from the surrounding environment, the guard cells, which surround the pore, 'set' the stomatal aperture to suit the prevailing conditions. Much research has concentrated on understanding the rapid intracellular changes that result in immediate changes to the stomatal aperture. In this study, we look instead at how stomata acclimate to longer timescale variations in their environment. We show that the closure-inducing signals abscisic acid (ABA), increased CO2, decreased relative air humidity and darkness each access a unique gene network made up of clusters (or modules) of common cellular processes. However, within these networks some gene clusters are shared amongst all four stimuli. All stimuli modulate the expression of members of the PYR/PYL/RCAR family of ABA receptors. However, they are modulated differentially in a stimulus-specific manner. Of the six members of the PYR/PYL/RCAR family expressed in guard cells, PYL2 is sufficient for guard cell ABA-induced responses, whereas in the responses to CO2, PYL4 and PYL5 are essential. Overall, our work shows the importance of ABA as a central regulator and integrator of long-term changes in stomatal behaviour, including sensitivity, elicited by external signals. Understanding this architecture may aid in breeding crops with improved water and nutrient efficiency.}, author = {Dittrich, M and Mueller, H M and Bauer, H and Peirats-Llobet, M and Rodriguez, P L and Geilfus, C M and Carpentier, S C and Al Rasheid, K A S and Kollist, H and Merilo, E and Herrmann, J and M{\"u}ller, T and Ache, P and Hetherington, A M and Hedrich, R}, journal = {Nat Plants}, keywords = {imported}, month = {sep}, number = 9, pages = {1002-1011}, title = {The role of Arabidopsis ABA receptors from the PYR/PYL/RCAR family in stomatal acclimation and closure signal integration}, volume = 5, year = 2019 }

  %0 Journal Article %1 Dittrich:2019:Nat-Plants:31451795 %A Dittrich, M %A Mueller, H M %A Bauer, H %A Peirats-Llobet, M %A Rodriguez, P L %A Geilfus, C M %A Carpentier, S C %A Al Rasheid, K A S %A Kollist, H %A Merilo, E %A Herrmann, J %A M{"u}ller, T %A Ache, P %A Hetherington, A M %A Hedrich, R %D 2019 %J Nat Plants %N 9 %P 1002-1011 %R 10.1038/s41477-019-0490-0 %T The role of Arabidopsis ABA receptors from the PYR/PYL/RCAR family in stomatal acclimation and closure signal integration %U https://www.ncbi.nlm.nih.gov/pubmed/31451795 %V 5 %X Stomata are microscopic pores found on the surfaces of leaves that act to control CO2 uptake and water loss. By integrating information derived from endogenous signals with cues from the surrounding environment, the guard cells, which surround the pore, 'set' the stomatal aperture to suit the prevailing conditions. Much research has concentrated on understanding the rapid intracellular changes that result in immediate changes to the stomatal aperture. In this study, we look instead at how stomata acclimate to longer timescale variations in their environment. We show that the closure-inducing signals abscisic acid (ABA), increased CO2, decreased relative air humidity and darkness each access a unique gene network made up of clusters (or modules) of common cellular processes. However, within these networks some gene clusters are shared amongst all four stimuli. All stimuli modulate the expression of members of the PYR/PYL/RCAR family of ABA receptors. However, they are modulated differentially in a stimulus-specific manner. Of the six members of the PYR/PYL/RCAR family expressed in guard cells, PYL2 is sufficient for guard cell ABA-induced responses, whereas in the responses to CO2, PYL4 and PYL5 are essential. Overall, our work shows the importance of ABA as a central regulator and integrator of long-term changes in stomatal behaviour, including sensitivity, elicited by external signals. Understanding this architecture may aid in breeding crops with improved water and nutrient efficiency.

• B{"o}hm, J., Messerer, M., M{"u}ller, H.M., Scholz-Starke, J., Gradogna, A., Scherzer, S., Maierhofer, T., Bazihizina, N., Zhang, H., Stigloher, C., Ache, P., Al-Rasheid, K.A.S., Mayer, K.F.X., Shabala, S., Carpaneto, A., Haberer, G., Zhu, J.K., Hedrich, R. (2018) Understanding the Molecular Basis of Salt Sequestration in Epidermal Bladder Cells of Chenopodium quinoa, Curr Biol, 28(19), 3075–3085, available: https://doi.org/10.1016/j.cub.2018.08.004.
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  Soil salinity is destroying arable land and is considered to be one of the major threats to global food security in the 21st century. Therefore, the ability of naturally salt-tolerant halophyte plants to sequester large quantities of salt in external structures, such as epidermal bladder cells (EBCs), is of great interest. Using Chenopodium quinoa, a pseudo-cereal halophyte of great economic potential, we have shown previously that, upon removal of salt bladders, quinoa becomes salt sensitive. In this work, we analyzed the molecular mechanism underlying the unique salt dumping capabilities of bladder cells in quinoa. The transporters differentially expressed in the EBC transcriptome and functional electrophysiological testing of key EBC transporters in Xenopus oocytes revealed that loading of Na+ and Cl- into EBCs is mediated by a set of tailored plasma and vacuole membrane-based sodium-selective channel and chloride-permeable transporter.

  @article{Bohm:2018:Curr-Biol:30245105, abstract = {Soil salinity is destroying arable land and is considered to be one of the major threats to global food security in the 21st century. Therefore, the ability of naturally salt-tolerant halophyte plants to sequester large quantities of salt in external structures, such as epidermal bladder cells (EBCs), is of great interest. Using Chenopodium quinoa, a pseudo-cereal halophyte of great economic potential, we have shown previously that, upon removal of salt bladders, quinoa becomes salt sensitive. In this work, we analyzed the molecular mechanism underlying the unique salt dumping capabilities of bladder cells in quinoa. The transporters differentially expressed in the EBC transcriptome and functional electrophysiological testing of key EBC transporters in Xenopus oocytes revealed that loading of Na+ and Cl- into EBCs is mediated by a set of tailored plasma and vacuole membrane-based sodium-selective channel and chloride-permeable transporter.}, author = {B{\"o}hm, J and Messerer, M and M{\"u}ller, H M and Scholz-Starke, J and Gradogna, A and Scherzer, S and Maierhofer, T and Bazihizina, N and Zhang, H and Stigloher, C and Ache, P and Al-Rasheid, K A S and Mayer, K F X and Shabala, S and Carpaneto, A and Haberer, G and Zhu, J K and Hedrich, R}, journal = {Curr Biol}, keywords = {imported}, month = {oct}, number = 19, pages = {3075-3085}, title = {Understanding the Molecular Basis of Salt Sequestration in Epidermal Bladder Cells of Chenopodium quinoa}, volume = 28, year = 2018 }

  %0 Journal Article %1 Bohm:2018:Curr-Biol:30245105 %A B{"o}hm, J %A Messerer, M %A M{"u}ller, H M %A Scholz-Starke, J %A Gradogna, A %A Scherzer, S %A Maierhofer, T %A Bazihizina, N %A Zhang, H %A Stigloher, C %A Ache, P %A Al-Rasheid, K A S %A Mayer, K F X %A Shabala, S %A Carpaneto, A %A Haberer, G %A Zhu, J K %A Hedrich, R %D 2018 %J Curr Biol %N 19 %P 3075-3085 %R 10.1016/j.cub.2018.08.004 %T Understanding the Molecular Basis of Salt Sequestration in Epidermal Bladder Cells of Chenopodium quinoa %U https://www.ncbi.nlm.nih.gov/pubmed/30245105 %V 28 %X Soil salinity is destroying arable land and is considered to be one of the major threats to global food security in the 21st century. Therefore, the ability of naturally salt-tolerant halophyte plants to sequester large quantities of salt in external structures, such as epidermal bladder cells (EBCs), is of great interest. Using Chenopodium quinoa, a pseudo-cereal halophyte of great economic potential, we have shown previously that, upon removal of salt bladders, quinoa becomes salt sensitive. In this work, we analyzed the molecular mechanism underlying the unique salt dumping capabilities of bladder cells in quinoa. The transporters differentially expressed in the EBC transcriptome and functional electrophysiological testing of key EBC transporters in Xenopus oocytes revealed that loading of Na+ and Cl- into EBCs is mediated by a set of tailored plasma and vacuole membrane-based sodium-selective channel and chloride-permeable transporter.
• Du, B., Kreuzwieser, J., Winkler, J.B., Ghirardo, A., Schnitzler, J.P., Ache, P., Alfarraj, S., Hedrich, R., White, P., Rennenberg, H. (2018) Physiological responses of date palm (Phoenix dactylifera) seedlings to acute ozone exposure at high temperature, Environ Pollut, 242(Pt A), 905–913, available: https://doi.org/10.1016/j.envpol.2018.07.059.
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  Vegetation in the Arabian Peninsula is facing high and steadily rising tropospheric ozone pollution. However, little is known about the impacts of elevated ozone on date palms, one of the most important indigenous economic species. To elucidate the physiological responses of date palm to peak levels of acute ozone exposure, seedlings were fumigated with 200 ppb ozone for 8 h. Net CO2 assimilation rate, stomatal conduction, total carbon, its isotope signature and total sugar contents in leaves and roots were not significantly affected by the treatment and visible symptoms of foliar damage were not induced. Ozone exposure did not affect hydrogen peroxide and thiol contents but diminished the activities of glutathione reductase and dehydroascorbate reductase, stimulated the oxidation of ascorbate, and resulted in elevated total ascorbate contents. Total nitrogen, soluble protein and lignin contents remained unchanged upon ozone exposure, but the abundance of low molecular weight nitrogen (LMWN) compounds such as amino acids and nitrate as well as other anions were strongly diminished in leaves and roots. Other nitrogen pools did not benefit from the decline of LMWN, indicating reduced uptake and/or enhanced release of these compounds into the soil as a systemic response to aboveground ozone exposure. Several phenolic compounds, concurrent with fatty acids and stearyl alcohol, accumulated in leaves, but declined in roots, whereas total phenol contents significantly increased in the roots. Together these results indicate that local and systemic changes in both, primary and secondary metabolism contribute to the high tolerance of date palms to short-term acute ozone exposure.

  @article{Du:2018:Environ-Pollut:30041163, abstract = {Vegetation in the Arabian Peninsula is facing high and steadily rising tropospheric ozone pollution. However, little is known about the impacts of elevated ozone on date palms, one of the most important indigenous economic species. To elucidate the physiological responses of date palm to peak levels of acute ozone exposure, seedlings were fumigated with 200 ppb ozone for 8 h. Net CO2 assimilation rate, stomatal conduction, total carbon, its isotope signature and total sugar contents in leaves and roots were not significantly affected by the treatment and visible symptoms of foliar damage were not induced. Ozone exposure did not affect hydrogen peroxide and thiol contents but diminished the activities of glutathione reductase and dehydroascorbate reductase, stimulated the oxidation of ascorbate, and resulted in elevated total ascorbate contents. Total nitrogen, soluble protein and lignin contents remained unchanged upon ozone exposure, but the abundance of low molecular weight nitrogen (LMWN) compounds such as amino acids and nitrate as well as other anions were strongly diminished in leaves and roots. Other nitrogen pools did not benefit from the decline of LMWN, indicating reduced uptake and/or enhanced release of these compounds into the soil as a systemic response to aboveground ozone exposure. Several phenolic compounds, concurrent with fatty acids and stearyl alcohol, accumulated in leaves, but declined in roots, whereas total phenol contents significantly increased in the roots. Together these results indicate that local and systemic changes in both, primary and secondary metabolism contribute to the high tolerance of date palms to short-term acute ozone exposure.}, author = {Du, B and Kreuzwieser, J and Winkler, J B and Ghirardo, A and Schnitzler, J P and Ache, P and Alfarraj, S and Hedrich, R and White, P and Rennenberg, H}, journal = {Environ Pollut}, keywords = {imported}, month = {nov}, number = {Pt A}, pages = {905-913}, title = {Physiological responses of date palm (Phoenix dactylifera) seedlings to acute ozone exposure at high temperature}, volume = 242, year = 2018 }

  %0 Journal Article %1 Du:2018:Environ-Pollut:30041163 %A Du, B %A Kreuzwieser, J %A Winkler, J B %A Ghirardo, A %A Schnitzler, J P %A Ache, P %A Alfarraj, S %A Hedrich, R %A White, P %A Rennenberg, H %D 2018 %J Environ Pollut %N Pt A %P 905-913 %R 10.1016/j.envpol.2018.07.059 %T Physiological responses of date palm (Phoenix dactylifera) seedlings to acute ozone exposure at high temperature %U https://www.ncbi.nlm.nih.gov/pubmed/30041163 %V 242 %X Vegetation in the Arabian Peninsula is facing high and steadily rising tropospheric ozone pollution. However, little is known about the impacts of elevated ozone on date palms, one of the most important indigenous economic species. To elucidate the physiological responses of date palm to peak levels of acute ozone exposure, seedlings were fumigated with 200 ppb ozone for 8 h. Net CO2 assimilation rate, stomatal conduction, total carbon, its isotope signature and total sugar contents in leaves and roots were not significantly affected by the treatment and visible symptoms of foliar damage were not induced. Ozone exposure did not affect hydrogen peroxide and thiol contents but diminished the activities of glutathione reductase and dehydroascorbate reductase, stimulated the oxidation of ascorbate, and resulted in elevated total ascorbate contents. Total nitrogen, soluble protein and lignin contents remained unchanged upon ozone exposure, but the abundance of low molecular weight nitrogen (LMWN) compounds such as amino acids and nitrate as well as other anions were strongly diminished in leaves and roots. Other nitrogen pools did not benefit from the decline of LMWN, indicating reduced uptake and/or enhanced release of these compounds into the soil as a systemic response to aboveground ozone exposure. Several phenolic compounds, concurrent with fatty acids and stearyl alcohol, accumulated in leaves, but declined in roots, whereas total phenol contents significantly increased in the roots. Together these results indicate that local and systemic changes in both, primary and secondary metabolism contribute to the high tolerance of date palms to short-term acute ozone exposure.
• Schäfer, N., Maierhofer, T., Herrmann, J., Jorgensen, M.E., Lind, C., von Meyer, K., Lautner, S., Fromm, J., Felder, M., Hetherington, A.M., Ache, P., Geiger, D., Hedrich, R. (2018) A Tandem Amino Acid Residue Motif in Guard Cell SLAC1 Anion Channel of Grasses Allows for the Control of Stomatal Aperture by Nitrate, Curr Biol, 28(9), 1370–1379, available: https://doi.org/10.1016/j.cub.2018.03.027.
  • [ Abstract ]
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  The latest major group of plants to evolve were the grasses. These became important in the mid-Paleogene�about 40 million years ago. During evolution, leaf CO2 uptake and transpirational water loss were optimized by the acquisition of grass-specific stomatal complexes. In contrast to the kidney-shaped�guard cells (GCs) typical of the dicots such as Arabidopsis, in the grasses and agronomically important cereals, the GCs are dumbbell shaped and are associated with morphologically distinct subsidiary cells (SCs). We studied the molecular basis of GC action in the major cereal crop barley. Upon feeding ABA to xylem sap of an intact barley leaf, stomata closed in a nitrate-dependent manner. This process was initiated by activation of GC SLAC-type anion channel currents. HvSLAC1 expressed in Xenopus oocytes gave rise to S-type anion currents that increased several-fold upon stimulation with >3�mM nitrate. We identified a tandem amino acid residue motif that within the SLAC1 channels differs fundamentally between monocots and dicots. When the motif of nitrate-insensitive dicot Arabidopsis SLAC1 was replaced by the monocot signature, AtSLAC1 converted into a grass-type like nitrate-sensitive channel. Our work reveals a fundamental difference between monocot and dicot GCs and prompts questions into the selective pressures during evolution that resulted in fundamental changes in the regulation of SLAC1 function.

  @article{Schafer:2018:Curr-Biol:29706511, abstract = {The latest major group of plants to evolve were the grasses. These became important in the mid-Paleogene�about 40 million years ago. During evolution, leaf CO2 uptake and transpirational water loss were optimized by the acquisition of grass-specific stomatal complexes. In contrast to the kidney-shaped�guard cells (GCs) typical of the dicots such as Arabidopsis, in the grasses and agronomically important cereals, the GCs are dumbbell shaped and are associated with morphologically distinct subsidiary cells (SCs). We studied the molecular basis of GC action in the major cereal crop barley. Upon feeding ABA to xylem sap of an intact barley leaf, stomata closed in a nitrate-dependent manner. This process was initiated by activation of GC SLAC-type anion channel currents. HvSLAC1 expressed in Xenopus oocytes gave rise to S-type anion currents that increased several-fold upon stimulation with >3�mM nitrate. We identified a tandem amino acid residue motif that within the SLAC1 channels differs fundamentally between monocots and dicots. When the motif of nitrate-insensitive dicot Arabidopsis SLAC1 was replaced by the monocot signature, AtSLAC1 converted into a grass-type like nitrate-sensitive channel. Our work reveals a fundamental difference between monocot and dicot GCs and prompts questions into the selective pressures during evolution that resulted in fundamental changes in the regulation of SLAC1 function.}, author = {Schäfer, N and Maierhofer, T and Herrmann, J and Jorgensen, M E and Lind, C and von Meyer, K and Lautner, S and Fromm, J and Felder, M and Hetherington, A M and Ache, P and Geiger, D and Hedrich, R}, journal = {Curr Biol}, keywords = {myown}, month = {may}, number = 9, pages = {1370-1379}, title = {A Tandem Amino Acid Residue Motif in Guard Cell SLAC1 Anion Channel of Grasses Allows for the Control of Stomatal Aperture by Nitrate}, volume = 28, year = 2018 }

  %0 Journal Article %1 Schafer:2018:Curr-Biol:29706511 %A Schäfer, N %A Maierhofer, T %A Herrmann, J %A Jorgensen, M E %A Lind, C %A von Meyer, K %A Lautner, S %A Fromm, J %A Felder, M %A Hetherington, A M %A Ache, P %A Geiger, D %A Hedrich, R %D 2018 %J Curr Biol %N 9 %P 1370-1379 %R 10.1016/j.cub.2018.03.027 %T A Tandem Amino Acid Residue Motif in Guard Cell SLAC1 Anion Channel of Grasses Allows for the Control of Stomatal Aperture by Nitrate %U https://www.ncbi.nlm.nih.gov/pubmed/29706511 %V 28 %X The latest major group of plants to evolve were the grasses. These became important in the mid-Paleogene�about 40 million years ago. During evolution, leaf CO2 uptake and transpirational water loss were optimized by the acquisition of grass-specific stomatal complexes. In contrast to the kidney-shaped�guard cells (GCs) typical of the dicots such as Arabidopsis, in the grasses and agronomically important cereals, the GCs are dumbbell shaped and are associated with morphologically distinct subsidiary cells (SCs). We studied the molecular basis of GC action in the major cereal crop barley. Upon feeding ABA to xylem sap of an intact barley leaf, stomata closed in a nitrate-dependent manner. This process was initiated by activation of GC SLAC-type anion channel currents. HvSLAC1 expressed in Xenopus oocytes gave rise to S-type anion currents that increased several-fold upon stimulation with >3�mM nitrate. We identified a tandem amino acid residue motif that within the SLAC1 channels differs fundamentally between monocots and dicots. When the motif of nitrate-insensitive dicot Arabidopsis SLAC1 was replaced by the monocot signature, AtSLAC1 converted into a grass-type like nitrate-sensitive channel. Our work reveals a fundamental difference between monocot and dicot GCs and prompts questions into the selective pressures during evolution that resulted in fundamental changes in the regulation of SLAC1 function.

• Zou, C., Chen, A., Xiao, L., Muller, H.M., Ache, P., Haberer, G., Zhang, M., Jia, W., Deng, P., Huang, R., Lang, D., Li, F., Zhan, D., Wu, X., Zhang, H., Bohm, J., Liu, R., Shabala, S., Hedrich, R., Zhu, J.K., Zhang, H. (2017) A high-quality genome assembly of quinoa provides insights into the molecular basis of salt bladder-based salinity tolerance and the exceptional nutritional value, Cell Res, 27, 1327–1340, available: https://doi.org/10.1038/cr.2017.124.
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  Chenopodium quinoa is a halophytic pseudocereal crop that is being cultivated in an ever-growing number of countries. Because quinoa is highly resistant to multiple abiotic stresses and its seed has a better nutritional value than any other major cereals, it is regarded as a future crop to ensure global food security. We generated a high-quality genome draft using an inbred line of the quinoa cultivar Real. The quinoa genome experienced one recent genome duplication about 4.3 million years ago, likely reflecting the genome fusion of two Chenopodium parents, in addition to the γ paleohexaploidization reported for most eudicots. The genome is highly repetitive (64.5% repeat content) and contains 54 438 protein-coding genes and 192 microRNA genes, with more than 99.3% having orthologous genes from glycophylic species. Stress tolerance in quinoa is associated with the expansion of genes involved in ion and nutrient transport, ABA homeostasis and signaling, and enhanced basal-level ABA responses. Epidermal salt bladder cells exhibit similar characteristics as trichomes, with a significantly higher expression of genes related to energy import and ABA biosynthesis compared with the leaf lamina. The quinoa genome sequence provides insights into its exceptional nutritional value and the evolution of halophytes, enabling the identification of genes involved in salinity tolerance, and providing the basis for molecular breeding in quinoa.Cell Research advance online publication 10 October 2017; doi:10.1038/cr.2017.124.

  @article{Zou:2017:Cell-Res:28994416, abstract = {Chenopodium quinoa is a halophytic pseudocereal crop that is being cultivated in an ever-growing number of countries. Because quinoa is highly resistant to multiple abiotic stresses and its seed has a better nutritional value than any other major cereals, it is regarded as a future crop to ensure global food security. We generated a high-quality genome draft using an inbred line of the quinoa cultivar Real. The quinoa genome experienced one recent genome duplication about 4.3 million years ago, likely reflecting the genome fusion of two Chenopodium parents, in addition to the γ paleohexaploidization reported for most eudicots. The genome is highly repetitive (64.5% repeat content) and contains 54 438 protein-coding genes and 192 microRNA genes, with more than 99.3% having orthologous genes from glycophylic species. Stress tolerance in quinoa is associated with the expansion of genes involved in ion and nutrient transport, ABA homeostasis and signaling, and enhanced basal-level ABA responses. Epidermal salt bladder cells exhibit similar characteristics as trichomes, with a significantly higher expression of genes related to energy import and ABA biosynthesis compared with the leaf lamina. The quinoa genome sequence provides insights into its exceptional nutritional value and the evolution of halophytes, enabling the identification of genes involved in salinity tolerance, and providing the basis for molecular breeding in quinoa.Cell Research advance online publication 10 October 2017; doi:10.1038/cr.2017.124.}, author = {Zou, C and Chen, A and Xiao, L and Muller, H M and Ache, P and Haberer, G and Zhang, M and Jia, W and Deng, P and Huang, R and Lang, D and Li, F and Zhan, D and Wu, X and Zhang, H and Bohm, J and Liu, R and Shabala, S and Hedrich, R and Zhu, J K and Zhang, H}, journal = {Cell Res}, keywords = {myown}, month = {oct}, pages = {1327-1340}, title = {A high-quality genome assembly of quinoa provides insights into the molecular basis of salt bladder-based salinity tolerance and the exceptional nutritional value}, volume = 27, year = 2017 }

  %0 Journal Article %1 Zou:2017:Cell-Res:28994416 %A Zou, C %A Chen, A %A Xiao, L %A Muller, H M %A Ache, P %A Haberer, G %A Zhang, M %A Jia, W %A Deng, P %A Huang, R %A Lang, D %A Li, F %A Zhan, D %A Wu, X %A Zhang, H %A Bohm, J %A Liu, R %A Shabala, S %A Hedrich, R %A Zhu, J K %A Zhang, H %D 2017 %J Cell Res %P 1327-1340 %R 10.1038/cr.2017.124 %T A high-quality genome assembly of quinoa provides insights into the molecular basis of salt bladder-based salinity tolerance and the exceptional nutritional value %U https://www.ncbi.nlm.nih.gov/pubmed/28994416 %V 27 %X Chenopodium quinoa is a halophytic pseudocereal crop that is being cultivated in an ever-growing number of countries. Because quinoa is highly resistant to multiple abiotic stresses and its seed has a better nutritional value than any other major cereals, it is regarded as a future crop to ensure global food security. We generated a high-quality genome draft using an inbred line of the quinoa cultivar Real. The quinoa genome experienced one recent genome duplication about 4.3 million years ago, likely reflecting the genome fusion of two Chenopodium parents, in addition to the γ paleohexaploidization reported for most eudicots. The genome is highly repetitive (64.5% repeat content) and contains 54 438 protein-coding genes and 192 microRNA genes, with more than 99.3% having orthologous genes from glycophylic species. Stress tolerance in quinoa is associated with the expansion of genes involved in ion and nutrient transport, ABA homeostasis and signaling, and enhanced basal-level ABA responses. Epidermal salt bladder cells exhibit similar characteristics as trichomes, with a significantly higher expression of genes related to energy import and ABA biosynthesis compared with the leaf lamina. The quinoa genome sequence provides insights into its exceptional nutritional value and the evolution of halophytes, enabling the identification of genes involved in salinity tolerance, and providing the basis for molecular breeding in quinoa.Cell Research advance online publication 10 October 2017; doi:10.1038/cr.2017.124.
• M{"u}ller, H.M., Sch{"a}fer, N., Bauer, H., Geiger, D., Lautner, S., Fromm, J., Riederer, M., Bueno, A., Nussbaumer, T., Mayer, K., Alquraishi, S.A., Alfarhan, A.H., Neher, E., Al-Rasheid, K.A.S., Ache, P., Hedrich, R. (2017) The desert plant Phoenix dactylifera closes stomata via nitrate-regulated SLAC1 anion channel, New Phytol, 216, 150–162, available: https://doi.org/10.1111/nph.14672.
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  Date palm Phoenix dactylifera is a desert crop well adapted to survive and produce fruits under extreme drought and heat. How are palms under such harsh environmental conditions able to limit transpirational water loss? Here, we analysed the cuticular waxes, stomata structure and function, and molecular biology of guard cells from P.�dactylifera. To understand the stomatal response to the water stress phytohormone of the desert plant, we cloned the major elements necessary for guard cell fast abscisic acid (ABA) signalling and reconstituted this ABA signalosome in Xenopus oocytes. The PhoenixSLAC1-type anion channel is regulated by ABA kinase PdOST1. Energy-dispersive X-ray analysis (EDXA) demonstrated that date palm guard cells release chloride during stomatal closure. However, in Cl(-) medium, PdOST1 did not activate the desert plant anion channel PdSLAC1 per�se. Only when nitrate was present at the extracellular face of the anion channel did the OST1-gated PdSLAC1 open, thus enabling chloride release. In the presence of nitrate, ABA enhanced and accelerated stomatal closure. Our findings indicate that, in date palm, the guard cell osmotic motor driving stomatal closure uses nitrate as the signal to open the major anion channel SLAC1. This initiates guard cell depolarization and the release of anions together with potassium.

  @article{Muller:2017:New-Phytol:28670699, abstract = {Date palm Phoenix dactylifera is a desert crop well adapted to survive and produce fruits under extreme drought and heat. How are palms under such harsh environmental conditions able to limit transpirational water loss? Here, we analysed the cuticular waxes, stomata structure and function, and molecular biology of guard cells from P.�dactylifera. To understand the stomatal response to the water stress phytohormone of the desert plant, we cloned the major elements necessary for guard cell fast abscisic acid (ABA) signalling and reconstituted this ABA signalosome in Xenopus oocytes. The PhoenixSLAC1-type anion channel is regulated by ABA kinase PdOST1. Energy-dispersive X-ray analysis (EDXA) demonstrated that date palm guard cells release chloride during stomatal closure. However, in Cl(-) medium, PdOST1 did not activate the desert plant anion channel PdSLAC1 per�se. Only when nitrate was present at the extracellular face of the anion channel did the OST1-gated PdSLAC1 open, thus enabling chloride release. In the presence of nitrate, ABA enhanced and accelerated stomatal closure. Our findings indicate that, in date palm, the guard cell osmotic motor driving stomatal closure uses nitrate as the signal to open the major anion channel SLAC1. This initiates guard cell depolarization and the release of anions together with potassium.}, author = {M{\"u}ller, H M and Sch{\"a}fer, N and Bauer, H and Geiger, D and Lautner, S and Fromm, J and Riederer, M and Bueno, A and Nussbaumer, T and Mayer, K and Alquraishi, S A and Alfarhan, A H and Neher, E and Al-Rasheid, K A S and Ache, P and Hedrich, R}, journal = {New Phytol}, keywords = {myown}, month = {jul}, pages = {150-162}, title = {The desert plant Phoenix dactylifera closes stomata via nitrate-regulated SLAC1 anion channel}, volume = 216, year = 2017 }

  %0 Journal Article %1 Muller:2017:New-Phytol:28670699 %A M{"u}ller, H M %A Sch{"a}fer, N %A Bauer, H %A Geiger, D %A Lautner, S %A Fromm, J %A Riederer, M %A Bueno, A %A Nussbaumer, T %A Mayer, K %A Alquraishi, S A %A Alfarhan, A H %A Neher, E %A Al-Rasheid, K A S %A Ache, P %A Hedrich, R %D 2017 %J New Phytol %P 150-162 %R 10.1111/nph.14672 %T The desert plant Phoenix dactylifera closes stomata via nitrate-regulated SLAC1 anion channel %U https://www.ncbi.nlm.nih.gov/pubmed/28670699 %V 216 %X Date palm Phoenix dactylifera is a desert crop well adapted to survive and produce fruits under extreme drought and heat. How are palms under such harsh environmental conditions able to limit transpirational water loss? Here, we analysed the cuticular waxes, stomata structure and function, and molecular biology of guard cells from P.�dactylifera. To understand the stomatal response to the water stress phytohormone of the desert plant, we cloned the major elements necessary for guard cell fast abscisic acid (ABA) signalling and reconstituted this ABA signalosome in Xenopus oocytes. The PhoenixSLAC1-type anion channel is regulated by ABA kinase PdOST1. Energy-dispersive X-ray analysis (EDXA) demonstrated that date palm guard cells release chloride during stomatal closure. However, in Cl(-) medium, PdOST1 did not activate the desert plant anion channel PdSLAC1 per�se. Only when nitrate was present at the extracellular face of the anion channel did the OST1-gated PdSLAC1 open, thus enabling chloride release. In the presence of nitrate, ABA enhanced and accelerated stomatal closure. Our findings indicate that, in date palm, the guard cell osmotic motor driving stomatal closure uses nitrate as the signal to open the major anion channel SLAC1. This initiates guard cell depolarization and the release of anions together with potassium.
• Safronov, O., Kreuzwieser, J., Haberer, G., Alyousif, M.S., Schulze, W., Al-Harbi, N., Arab, L., Ache, P., Stempfl, T., Kruse, J., Mayer, K.X., Hedrich, R., Rennenberg, H., Saloj{"a}rvi, J., Kangasj{"a}rvi, J. (2017) Detecting early signs of heat and drought stress in Phoenix dactylifera (date palm), PLoS One, 12, e0177883, available: https://doi.org/10.1371/journal.pone.0177883.
  • [ Abstract ]
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  Plants adapt to the environment by either long-term genome evolution or by acclimatization processes where the cellular processes and metabolism of the plant are adjusted within the existing potential in the genome. Here we studied the adaptation strategies in date palm, Phoenix dactylifera, under mild heat, drought and combined heat and drought by transcriptomic and metabolomic profiling. In transcriptomics data, combined heat and drought resembled heat response, whereas in metabolomics data it was more similar to drought. In both conditions, soluble carbohydrates, such as fucose, and glucose derivatives, were increased, suggesting a switch to carbohydrate metabolism and cell wall biogenesis. This result is consistent with the evidence from transcriptomics and cis-motif analysis. In addition, transcriptomics data showed transcriptional activation of genes related to reactive oxygen species in all three conditions (drought, heat, and combined heat and drought), suggesting increased activity of enzymatic antioxidant systems in cytosol, chloroplast and peroxisome. Finally, the genes that were differentially expressed in heat and combined heat and drought stresses were significantly enriched for circadian and diurnal rhythm motifs, suggesting new stress avoidance strategies.

  @article{Safronov:2017:PLoS-One:28570677, abstract = {Plants adapt to the environment by either long-term genome evolution or by acclimatization processes where the cellular processes and metabolism of the plant are adjusted within the existing potential in the genome. Here we studied the adaptation strategies in date palm, Phoenix dactylifera, under mild heat, drought and combined heat and drought by transcriptomic and metabolomic profiling. In transcriptomics data, combined heat and drought resembled heat response, whereas in metabolomics data it was more similar to drought. In both conditions, soluble carbohydrates, such as fucose, and glucose derivatives, were increased, suggesting a switch to carbohydrate metabolism and cell wall biogenesis. This result is consistent with the evidence from transcriptomics and cis-motif analysis. In addition, transcriptomics data showed transcriptional activation of genes related to reactive oxygen species in all three conditions (drought, heat, and combined heat and drought), suggesting increased activity of enzymatic antioxidant systems in cytosol, chloroplast and peroxisome. Finally, the genes that were differentially expressed in heat and combined heat and drought stresses were significantly enriched for circadian and diurnal rhythm motifs, suggesting new stress avoidance strategies.}, author = {Safronov, O and Kreuzwieser, J and Haberer, G and Alyousif, M S and Schulze, W and Al-Harbi, N and Arab, L and Ache, P and Stempfl, T and Kruse, J and Mayer, K X and Hedrich, R and Rennenberg, H and Saloj{\"a}rvi, J and Kangasj{\"a}rvi, J}, journal = {PLoS One}, keywords = {myown}, pages = {e0177883}, title = {Detecting early signs of heat and drought stress in Phoenix dactylifera (date palm)}, volume = 12, year = 2017 }

  %0 Journal Article %1 Safronov:2017:PLoS-One:28570677 %A Safronov, O %A Kreuzwieser, J %A Haberer, G %A Alyousif, M S %A Schulze, W %A Al-Harbi, N %A Arab, L %A Ache, P %A Stempfl, T %A Kruse, J %A Mayer, K X %A Hedrich, R %A Rennenberg, H %A Saloj{"a}rvi, J %A Kangasj{"a}rvi, J %D 2017 %J PLoS One %P e0177883 %R 10.1371/journal.pone.0177883 %T Detecting early signs of heat and drought stress in Phoenix dactylifera (date palm) %U https://www.ncbi.nlm.nih.gov/pubmed/28570677 %V 12 %X Plants adapt to the environment by either long-term genome evolution or by acclimatization processes where the cellular processes and metabolism of the plant are adjusted within the existing potential in the genome. Here we studied the adaptation strategies in date palm, Phoenix dactylifera, under mild heat, drought and combined heat and drought by transcriptomic and metabolomic profiling. In transcriptomics data, combined heat and drought resembled heat response, whereas in metabolomics data it was more similar to drought. In both conditions, soluble carbohydrates, such as fucose, and glucose derivatives, were increased, suggesting a switch to carbohydrate metabolism and cell wall biogenesis. This result is consistent with the evidence from transcriptomics and cis-motif analysis. In addition, transcriptomics data showed transcriptional activation of genes related to reactive oxygen species in all three conditions (drought, heat, and combined heat and drought), suggesting increased activity of enzymatic antioxidant systems in cytosol, chloroplast and peroxisome. Finally, the genes that were differentially expressed in heat and combined heat and drought stresses were significantly enriched for circadian and diurnal rhythm motifs, suggesting new stress avoidance strategies.
• Malcheska, F., Ahmad, A., Batool, S., M{"u}ller, H.M., Ludwig-M{"u}ller, J., Kreuzwieser, J., Randewig, D., H{"a}nsch, R., Mendel, R.R., Hell, R., Wirtz, M., Geiger, D., Ache, P., Hedrich, R., Herschbach, C., Rennenberg, H. (2017) Drought enhanced xylem sap sulfate closes stomata by affecting ALMT12 and guard cell ABA synthesis, Plant Physiol, 174, 798–814, available: https://doi.org/10.1104/pp.16.01784.
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  Water limitation of plants causes stomatal closure to prevent water loss by transpiration. For this purpose, progressing soil water deficit is communicated from roots to shoots. Abscisic acid (ABA) is the key signal in stress-induced stomatal closure, however, ABA as early xylem-delivered signal is still a matter of debate. In the present study, poplar plants were exposed to water stress to investigate xylem sap sulfate and ABA, stomatal conductance and sulfate transporter (SULTR) expression. In addition, stomatal behavior and expression of ABA receptors, drought responsive genes, transcription factors and NCED3 were studied after feeding sulfate and ABA to detached poplar leaves and epidermal peels of Arabidopsis. The results show that increased xylem sap sulfate is achieved upon drought by reduced xylem unloading by PtaSULTR3;3a and PtaSULTR1;1, and by enhanced loading from parenchyma cells into the xylem via PtaALMT3b. Sulfate application caused stomatal closure in excised leaves and peeled epidermis. In the loss of sulfate-channel function mutant, Atalmt12, sulfate-triggered stomatal closure was impaired. The QUAC1/ALMT12 anion channel heterologous expressed in oocytes was gated open by extracellular sulfate. Sulfate up-regulated the expression of NCED3, a key step of ABA synthesis, in guard cells. In conclusion, xylem-derived sulfate seems an early chemical signal of drought inducing stomatal closure via QUAC1/ALMT12 and/or guard cell ABA synthesis.

  @article{Malcheska:2017:Plant-Physiol:28446637, abstract = {Water limitation of plants causes stomatal closure to prevent water loss by transpiration. For this purpose, progressing soil water deficit is communicated from roots to shoots. Abscisic acid (ABA) is the key signal in stress-induced stomatal closure, however, ABA as early xylem-delivered signal is still a matter of debate. In the present study, poplar plants were exposed to water stress to investigate xylem sap sulfate and ABA, stomatal conductance and sulfate transporter (SULTR) expression. In addition, stomatal behavior and expression of ABA receptors, drought responsive genes, transcription factors and NCED3 were studied after feeding sulfate and ABA to detached poplar leaves and epidermal peels of Arabidopsis. The results show that increased xylem sap sulfate is achieved upon drought by reduced xylem unloading by PtaSULTR3;3a and PtaSULTR1;1, and by enhanced loading from parenchyma cells into the xylem via PtaALMT3b. Sulfate application caused stomatal closure in excised leaves and peeled epidermis. In the loss of sulfate-channel function mutant, Atalmt12, sulfate-triggered stomatal closure was impaired. The QUAC1/ALMT12 anion channel heterologous expressed in oocytes was gated open by extracellular sulfate. Sulfate up-regulated the expression of NCED3, a key step of ABA synthesis, in guard cells. In conclusion, xylem-derived sulfate seems an early chemical signal of drought inducing stomatal closure via QUAC1/ALMT12 and/or guard cell ABA synthesis.}, author = {Malcheska, F and Ahmad, A and Batool, S and M{\"u}ller, H M and Ludwig-M{\"u}ller, J and Kreuzwieser, J and Randewig, D and H{\"a}nsch, R and Mendel, R R and Hell, R and Wirtz, M and Geiger, D and Ache, P and Hedrich, R and Herschbach, C and Rennenberg, H}, journal = {Plant Physiol}, keywords = {myown}, month = {apr}, pages = {798-814}, title = {Drought enhanced xylem sap sulfate closes stomata by affecting ALMT12 and guard cell ABA synthesis}, volume = 174, year = 2017 }

  %0 Journal Article %1 Malcheska:2017:Plant-Physiol:28446637 %A Malcheska, F %A Ahmad, A %A Batool, S %A M{"u}ller, H M %A Ludwig-M{"u}ller, J %A Kreuzwieser, J %A Randewig, D %A H{"a}nsch, R %A Mendel, R R %A Hell, R %A Wirtz, M %A Geiger, D %A Ache, P %A Hedrich, R %A Herschbach, C %A Rennenberg, H %D 2017 %J Plant Physiol %P 798-814 %R 10.1104/pp.16.01784 %T Drought enhanced xylem sap sulfate closes stomata by affecting ALMT12 and guard cell ABA synthesis %U https://www.ncbi.nlm.nih.gov/pubmed/28446637 %V 174 %X Water limitation of plants causes stomatal closure to prevent water loss by transpiration. For this purpose, progressing soil water deficit is communicated from roots to shoots. Abscisic acid (ABA) is the key signal in stress-induced stomatal closure, however, ABA as early xylem-delivered signal is still a matter of debate. In the present study, poplar plants were exposed to water stress to investigate xylem sap sulfate and ABA, stomatal conductance and sulfate transporter (SULTR) expression. In addition, stomatal behavior and expression of ABA receptors, drought responsive genes, transcription factors and NCED3 were studied after feeding sulfate and ABA to detached poplar leaves and epidermal peels of Arabidopsis. The results show that increased xylem sap sulfate is achieved upon drought by reduced xylem unloading by PtaSULTR3;3a and PtaSULTR1;1, and by enhanced loading from parenchyma cells into the xylem via PtaALMT3b. Sulfate application caused stomatal closure in excised leaves and peeled epidermis. In the loss of sulfate-channel function mutant, Atalmt12, sulfate-triggered stomatal closure was impaired. The QUAC1/ALMT12 anion channel heterologous expressed in oocytes was gated open by extracellular sulfate. Sulfate up-regulated the expression of NCED3, a key step of ABA synthesis, in guard cells. In conclusion, xylem-derived sulfate seems an early chemical signal of drought inducing stomatal closure via QUAC1/ALMT12 and/or guard cell ABA synthesis.

• Jaborsky, M., Maierhofer, T., Olbrich, A., Escalante-Perez, M., Muller, H.M., Simon, J., Krol, E., Cuin, T.A., Fromm, J., Ache, P., Geiger, D., Hedrich, R. (2016) SLAH3-type anion channel expressed in poplar secretory epithelia operates in calcium kinase CPK-autonomous manner, New Phytol, 210, 922–33, available: https://doi.org/10.1111/nph.13841.
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  @article{RN25, author = {Jaborsky, M. and Maierhofer, T. and Olbrich, A. and Escalante-Perez, M. and Muller, H. M. and Simon, J. and Krol, E. and Cuin, T. A. and Fromm, J. and Ache, P. and Geiger, D. and Hedrich, R.}, journal = {New Phytol}, keywords = {myown}, pages = {922-33}, title = {SLAH3-type anion channel expressed in poplar secretory epithelia operates in calcium kinase CPK-autonomous manner}, type = {Journal Article}, volume = 210, year = 2016 }

  %0 Journal Article %1 RN25 %A Jaborsky, M. %A Maierhofer, T. %A Olbrich, A. %A Escalante-Perez, M. %A Muller, H. M. %A Simon, J. %A Krol, E. %A Cuin, T. A. %A Fromm, J. %A Ache, P. %A Geiger, D. %A Hedrich, R. %D 2016 %J New Phytol %P 922-33 %R 10.1111/nph.13841 %T SLAH3-type anion channel expressed in poplar secretory epithelia operates in calcium kinase CPK-autonomous manner %U http://www.ncbi.nlm.nih.gov/pubmed/26831448 %V 210
• Arab, L., Kreuzwieser, J., Kruse, J., Zimmer, I., Ache, P., Alfarraj, S., Al-Rasheid, K.A.S., Schnitzler, J.P., Hedrich, R., Rennenberg, H. (2016) Acclimation to heat and drought-Lessons to learn from the date palm (Phoenix dactylifera), Environ Exp Bot, 125, 20–30, available: https://doi.org/10.1016/j.envexpbot.2016.01.003.
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  @article{RN5, author = {Arab, L. and Kreuzwieser, J. and Kruse, J. and Zimmer, I. and Ache, P. and Alfarraj, S. and Al-Rasheid, K. A. S. and Schnitzler, J. P. and Hedrich, R. and Rennenberg, H.}, journal = {Environ Exp Bot}, keywords = {myown}, pages = {20-30}, title = {Acclimation to heat and drought-Lessons to learn from the date palm (Phoenix dactylifera)}, type = {Journal Article}, volume = 125, year = 2016 }

  %0 Journal Article %1 RN5 %A Arab, L. %A Kreuzwieser, J. %A Kruse, J. %A Zimmer, I. %A Ache, P. %A Alfarraj, S. %A Al-Rasheid, K. A. S. %A Schnitzler, J. P. %A Hedrich, R. %A Rennenberg, H. %D 2016 %J Environ Exp Bot %P 20-30 %R 10.1016/j.envexpbot.2016.01.003 %T Acclimation to heat and drought-Lessons to learn from the date palm (Phoenix dactylifera) %V 125

• Prasch, C.M., Ott, K.V., Bauer, H., Ache, P., Hedrich, R., Sonnewald, U. (2015) ss-amylase1 mutant Arabidopsis plants show improved drought tolerance due to reduced starch breakdown in guard cells, J Exp Bot, 66, 6059–67, available: https://doi.org/10.1093/jxb/erv323.
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  @article{RN33, author = {Prasch, C. M. and Ott, K. V. and Bauer, H. and Ache, P. and Hedrich, R. and Sonnewald, U.}, journal = {J Exp Bot}, keywords = {myown}, pages = {6059-67}, title = {ss-amylase1 mutant Arabidopsis plants show improved drought tolerance due to reduced starch breakdown in guard cells}, type = {Journal Article}, volume = 66, year = 2015 }

  %0 Journal Article %1 RN33 %A Prasch, C. M. %A Ott, K. V. %A Bauer, H. %A Ache, P. %A Hedrich, R. %A Sonnewald, U. %D 2015 %J J Exp Bot %P 6059-67 %R 10.1093/jxb/erv323 %T ss-amylase1 mutant Arabidopsis plants show improved drought tolerance due to reduced starch breakdown in guard cells %U http://www.ncbi.nlm.nih.gov/pubmed/26139825 %V 66

• Maierhofer, T., Lind, C., Huttl, S., Scherzer, S., Papenfuss, M., Simon, J., Al-Rasheid, K.A.S., Ache, P., Rennenberg, H., Hedrich, R., Muller, T.D., Geiger, D. (2014) A single-pore residue renders the Arabidopsis root anion channel SLAH2 highly nitrate selective, Plant Cell, 26, 2554–2567, available: https://doi.org/10.1105/tpc.114.125849.
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  @article{RN30, author = {Maierhofer, T. and Lind, C. and Huttl, S. and Scherzer, S. and Papenfuss, M. and Simon, J. and Al-Rasheid, K. A. S. and Ache, P. and Rennenberg, H. and Hedrich, R. and Muller, T. D. and Geiger, D.}, journal = {Plant Cell}, keywords = {myown}, pages = {2554-2567}, title = {A single-pore residue renders the Arabidopsis root anion channel SLAH2 highly nitrate selective}, type = {Journal Article}, volume = 26, year = 2014 }

  %0 Journal Article %1 RN30 %A Maierhofer, T. %A Lind, C. %A Huttl, S. %A Scherzer, S. %A Papenfuss, M. %A Simon, J. %A Al-Rasheid, K. A. S. %A Ache, P. %A Rennenberg, H. %A Hedrich, R. %A Muller, T. D. %A Geiger, D. %D 2014 %J Plant Cell %P 2554-2567 %R 10.1105/tpc.114.125849 %T A single-pore residue renders the Arabidopsis root anion channel SLAH2 highly nitrate selective %U http://www.ncbi.nlm.nih.gov/pubmed/24938289 %V 26

• Bauer, H., Ache, P., Lautner, S., Fromm, J., Hartung, W., Al-Rasheid, K.A.S., Sonnewald, S., Sonnewald, U., Kneitz, S., Lachmann, N., Mendel, R.R., Bittner, F., Hetherington, A.M., Hedrich, R. (2013) The stomatal response to reduced relative humidity requires guard cell-autonomous ABA synthesis, Curr Biol, 23, 53–57, available: https://doi.org/10.1016/j.cub.2012.11.022.
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  @article{RN7, author = {Bauer, H. and Ache, P. and Lautner, S. and Fromm, J. and Hartung, W. and Al-Rasheid, K. A. S. and Sonnewald, S. and Sonnewald, U. and Kneitz, S. and Lachmann, N. and Mendel, R. R. and Bittner, F. and Hetherington, A. M. and Hedrich, R.}, journal = {Curr Biol}, keywords = {myown}, pages = {53-57}, title = {The stomatal response to reduced relative humidity requires guard cell-autonomous ABA synthesis}, type = {Journal Article}, volume = 23, year = 2013 }

  %0 Journal Article %1 RN7 %A Bauer, H. %A Ache, P. %A Lautner, S. %A Fromm, J. %A Hartung, W. %A Al-Rasheid, K. A. S. %A Sonnewald, S. %A Sonnewald, U. %A Kneitz, S. %A Lachmann, N. %A Mendel, R. R. %A Bittner, F. %A Hetherington, A. M. %A Hedrich, R. %D 2013 %J Curr Biol %P 53-57 %R 10.1016/j.cub.2012.11.022 %T The stomatal response to reduced relative humidity requires guard cell-autonomous ABA synthesis %U http://www.ncbi.nlm.nih.gov/pubmed/23219726 %V 23
• Bauer, H., Ache, P., Wohlfart, F., Al-Rasheid, K.A.S., Sonnewald, S., Sonnewald, U., Kneitz, S., Hetherington, A.M., Hedrich, R. (2013) How do stomata sense reductions in atmospheric relative humidity?, Mol Plant, 6, 1703–1706, available: https://doi.org/10.1093/mp/sst055.
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  @article{RN8, author = {Bauer, H. and Ache, P. and Wohlfart, F. and Al-Rasheid, K. A. S. and Sonnewald, S. and Sonnewald, U. and Kneitz, S. and Hetherington, A. M. and Hedrich, R.}, journal = {Mol Plant}, keywords = {myown}, pages = {1703–1706}, title = {How do stomata sense reductions in atmospheric relative humidity?}, type = {Journal Article}, volume = 6, year = 2013 }

  %0 Journal Article %1 RN8 %A Bauer, H. %A Ache, P. %A Wohlfart, F. %A Al-Rasheid, K. A. S. %A Sonnewald, S. %A Sonnewald, U. %A Kneitz, S. %A Hetherington, A. M. %A Hedrich, R. %D 2013 %J Mol Plant %P 1703–1706 %R 10.1093/mp/sst055 %T How do stomata sense reductions in atmospheric relative humidity? %U http://www.ncbi.nlm.nih.gov/pubmed/23536729 %V 6

• Larisch, C., Dittrich, M., Wildhagen, H., Lautner, S., Fromm, J., Polle, A., Hedrich, R., Rennenberg, H., Muller, T., Ache, P. (2012) Poplar wood rays are involved in seasonal remodeling of tree physiology, Plant Physiol, 160, 1515–29, available: https://doi.org/10.1104/pp.112.202291.
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  @article{RN28, author = {Larisch, C. and Dittrich, M. and Wildhagen, H. and Lautner, S. and Fromm, J. and Polle, A. and Hedrich, R. and Rennenberg, H. and Muller, T. and Ache, P.}, journal = {Plant Physiol}, keywords = {myown}, pages = {1515-29}, title = {Poplar wood rays are involved in seasonal remodeling of tree physiology}, type = {Journal Article}, volume = 160, year = 2012 }

  %0 Journal Article %1 RN28 %A Larisch, C. %A Dittrich, M. %A Wildhagen, H. %A Lautner, S. %A Fromm, J. %A Polle, A. %A Hedrich, R. %A Rennenberg, H. %A Muller, T. %A Ache, P. %D 2012 %J Plant Physiol %P 1515-29 %R 10.1104/pp.112.202291 %T Poplar wood rays are involved in seasonal remodeling of tree physiology %U http://www.ncbi.nlm.nih.gov/pubmed/22992511 %V 160
• Escalante-Perez, M., Jaborsky, M., Reinders, J., Kurzai, O., Hedrich, R., Ache, P. (2012) Poplar extrafloral nectar is protected against plant and human pathogenic fungus, Mol Plant, 5, 1157–9, available: https://doi.org/10.1093/mp/sss072.
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  @article{RN17, author = {Escalante-Perez, M. and Jaborsky, M. and Reinders, J. and Kurzai, O. and Hedrich, R. and Ache, P.}, journal = {Mol Plant}, keywords = {myown}, pages = {1157-9}, title = {Poplar extrafloral nectar is protected against plant and human pathogenic fungus}, type = {Journal Article}, volume = 5, year = 2012 }

  %0 Journal Article %1 RN17 %A Escalante-Perez, M. %A Jaborsky, M. %A Reinders, J. %A Kurzai, O. %A Hedrich, R. %A Ache, P. %D 2012 %J Mol Plant %P 1157-9 %R 10.1093/mp/sss072 %T Poplar extrafloral nectar is protected against plant and human pathogenic fungus %U http://www.ncbi.nlm.nih.gov/pubmed/22859733 %V 5
• Escalante-Perez, M., Jaborsky, M., Lautner, S., Fromm, J., Muller, T., Dittrich, M., Kunert, M., Boland, W., Hedrich, R., Ache, P. (2012) Poplar extrafloral nectaries: two types, two strategies of indirect defenses against herbivores, Plant Physiol, 159, 1176–91, available: https://doi.org/10.1104/pp.112.196014.
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  @article{RN16, author = {Escalante-Perez, M. and Jaborsky, M. and Lautner, S. and Fromm, J. and Muller, T. and Dittrich, M. and Kunert, M. and Boland, W. and Hedrich, R. and Ache, P.}, journal = {Plant Physiol}, keywords = {myown}, pages = {1176-91}, title = {Poplar extrafloral nectaries: two types, two strategies of indirect defenses against herbivores}, type = {Journal Article}, volume = 159, year = 2012 }

  %0 Journal Article %1 RN16 %A Escalante-Perez, M. %A Jaborsky, M. %A Lautner, S. %A Fromm, J. %A Muller, T. %A Dittrich, M. %A Kunert, M. %A Boland, W. %A Hedrich, R. %A Ache, P. %D 2012 %J Plant Physiol %P 1176-91 %R 10.1104/pp.112.196014 %T Poplar extrafloral nectaries: two types, two strategies of indirect defenses against herbivores %U http://www.plantphysiol.org/content/159/3/1176.full.pdf %V 159

• Geiger, D., Maierhofer, T., Al-Rasheid, K.A.S., Scherzer, S., Mumm, P., Liese, A., Ache, P., Wellmann, C., Marten, I., Grill, E., Romeis, T., Hedrich, R. (2011) Stomatal closure by fast abscisic acid signaling is mediated by the guard cell anion channel SLAH3 and the receptor RCAR1, Sci Signal, 4, ra32, available: https://doi.org/10.1126/scisignal.2001346.
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  @article{RN19, author = {Geiger, D. and Maierhofer, T. and Al-Rasheid, K. A. S. and Scherzer, S. and Mumm, P. and Liese, A. and Ache, P. and Wellmann, C. and Marten, I. and Grill, E. and Romeis, T. and Hedrich, R.}, journal = {Sci Signal}, keywords = {myown}, pages = {ra32}, title = {Stomatal closure by fast abscisic acid signaling is mediated by the guard cell anion channel SLAH3 and the receptor RCAR1}, type = {Journal Article}, volume = 4, year = 2011 }

  %0 Journal Article %1 RN19 %A Geiger, D. %A Maierhofer, T. %A Al-Rasheid, K. A. S. %A Scherzer, S. %A Mumm, P. %A Liese, A. %A Ache, P. %A Wellmann, C. %A Marten, I. %A Grill, E. %A Romeis, T. %A Hedrich, R. %D 2011 %J Sci Signal %P ra32 %R 10.1126/scisignal.2001346 %T Stomatal closure by fast abscisic acid signaling is mediated by the guard cell anion channel SLAH3 and the receptor RCAR1 %U http://www.ncbi.nlm.nih.gov/pubmed/21586729 %V 4

• Ache, P., Fromm, J., Hedrich, R. (2010) Potassium-dependent wood formation in poplar: seasonal aspects and environmental limitations, Plant Biol, 12, 259–67, available: https://doi.org/10.1111/j.1438-8677.2009.00282.x.
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  @article{RN4, author = {Ache, P. and Fromm, J. and Hedrich, R.}, journal = {Plant Biol}, keywords = {myown}, pages = {259-67}, title = {Potassium-dependent wood formation in poplar: seasonal aspects and environmental limitations}, type = {Publication}, volume = 12, year = 2010 }

  %0 Journal Article %1 RN4 %A Ache, P. %A Fromm, J. %A Hedrich, R. %D 2010 %J Plant Biol %P 259-67 %R 10.1111/j.1438-8677.2009.00282.x %T Potassium-dependent wood formation in poplar: seasonal aspects and environmental limitations %U http://www.ncbi.nlm.nih.gov/pubmed/20398233 %V 12
• Rienmuller, F., Beyhl, D., Lautner, S., Fromm, J., Al-Rasheid, K.A.S., Ache, P., Farmer, E.E., Marten, I., Hedrich, R. (2010) Guard cell-specific calcium sensitivity of high density and activity SV/TPC1 channels, Plant Cell Physiol, 51, 1548–54, available: https://doi.org/10.1093/pcp/pcq102.
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  @article{RN35, author = {Rienmuller, F. and Beyhl, D. and Lautner, S. and Fromm, J. and Al-Rasheid, K. A. S. and Ache, P. and Farmer, E. E. and Marten, I. and Hedrich, R.}, journal = {Plant Cell Physiol}, keywords = {myown}, pages = {1548-54}, title = {Guard cell-specific calcium sensitivity of high density and activity SV/TPC1 channels}, type = {Journal Article}, volume = 51, year = 2010 }

  %0 Journal Article %1 RN35 %A Rienmuller, F. %A Beyhl, D. %A Lautner, S. %A Fromm, J. %A Al-Rasheid, K. A. S. %A Ache, P. %A Farmer, E. E. %A Marten, I. %A Hedrich, R. %D 2010 %J Plant Cell Physiol %P 1548-54 %R 10.1093/pcp/pcq102 %T Guard cell-specific calcium sensitivity of high density and activity SV/TPC1 channels %U http://www.ncbi.nlm.nih.gov/pubmed/20630987 %V 51
• Herschbach, C., Teuber, M., Eiblmeier, M., Ehlting, B., Ache, P., Polle, A., Schnitzler, J.P., Rennenberg, H. (2010) Changes in sulphur metabolism of grey poplar (Populus x canescens) leaves during salt stress: a metabolic link to photorespiration, Tree Physiol, 30, 1161–1173, available: https://doi.org/10.1093/treephys/tpq041.
  • [ Abstract ]
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  The poplar hybrid Populus x canescens (syn. Populus tremula x Populus alba) was subjected to salt stress by applying 75 mM NaCl for 2 weeks in hydroponic cultures. Decreasing maximum quantum yield (Fv/Fm) indicated damage of photosystem II (PS II), which was more pronounced under nitrate compared with ammonium nutrition. In vivo staining with diaminobenzidine showed no accumulation of H(2)O(2) in the leaf lamina; moreover, staining intensity even decreased. But at the leaf margins, development of necrotic tissue was associated with a strong accumulation of H(2)O(2). Glutathione (GSH) contents increased in response to NaCl stress in leaves but not in roots, the primary site of salt exposure. The increasing leaf GSH concentrations correlated with stress-induced decreases in transpiration and net CO(2) assimilation rates at light saturation. Enhanced rates of photorespiration could also be involved in preventing reactive oxygen species formation in chloroplasts and, thus, in protecting PS II from damage. Accumulation of Gly and Ser in leaves indeed indicates increasing rates of photorespiration. Since Ser and Gly are both immediate precursors of GSH that can limit GSH synthesis, it is concluded that the salt-induced accumulation of leaf GSH results from enhanced photorespiration and is thus probably restricted to the cytosol.

  @article{Herschbach:2010:Tree-Physiol:20516486, abstract = {The poplar hybrid Populus x canescens (syn. Populus tremula x Populus alba) was subjected to salt stress by applying 75 mM NaCl for 2 weeks in hydroponic cultures. Decreasing maximum quantum yield (Fv/Fm) indicated damage of photosystem II (PS II), which was more pronounced under nitrate compared with ammonium nutrition. In vivo staining with diaminobenzidine showed no accumulation of H(2)O(2) in the leaf lamina; moreover, staining intensity even decreased. But at the leaf margins, development of necrotic tissue was associated with a strong accumulation of H(2)O(2). Glutathione (GSH) contents increased in response to NaCl stress in leaves but not in roots, the primary site of salt exposure. The increasing leaf GSH concentrations correlated with stress-induced decreases in transpiration and net CO(2) assimilation rates at light saturation. Enhanced rates of photorespiration could also be involved in preventing reactive oxygen species formation in chloroplasts and, thus, in protecting PS II from damage. Accumulation of Gly and Ser in leaves indeed indicates increasing rates of photorespiration. Since Ser and Gly are both immediate precursors of GSH that can limit GSH synthesis, it is concluded that the salt-induced accumulation of leaf GSH results from enhanced photorespiration and is thus probably restricted to the cytosol.}, author = {Herschbach, C and Teuber, M and Eiblmeier, M and Ehlting, B and Ache, P and Polle, A and Schnitzler, J P and Rennenberg, H}, journal = {Tree Physiol}, keywords = {myown}, month = {sep}, pages = {1161-1173}, title = {Changes in sulphur metabolism of grey poplar (Populus x canescens) leaves during salt stress: a metabolic link to photorespiration}, volume = 30, year = 2010 }

  %0 Journal Article %1 Herschbach:2010:Tree-Physiol:20516486 %A Herschbach, C %A Teuber, M %A Eiblmeier, M %A Ehlting, B %A Ache, P %A Polle, A %A Schnitzler, J P %A Rennenberg, H %D 2010 %J Tree Physiol %P 1161-1173 %R 10.1093/treephys/tpq041 %T Changes in sulphur metabolism of grey poplar (Populus x canescens) leaves during salt stress: a metabolic link to photorespiration %U https://www.ncbi.nlm.nih.gov/pubmed/20516486 %V 30 %X The poplar hybrid Populus x canescens (syn. Populus tremula x Populus alba) was subjected to salt stress by applying 75 mM NaCl for 2 weeks in hydroponic cultures. Decreasing maximum quantum yield (Fv/Fm) indicated damage of photosystem II (PS II), which was more pronounced under nitrate compared with ammonium nutrition. In vivo staining with diaminobenzidine showed no accumulation of H(2)O(2) in the leaf lamina; moreover, staining intensity even decreased. But at the leaf margins, development of necrotic tissue was associated with a strong accumulation of H(2)O(2). Glutathione (GSH) contents increased in response to NaCl stress in leaves but not in roots, the primary site of salt exposure. The increasing leaf GSH concentrations correlated with stress-induced decreases in transpiration and net CO(2) assimilation rates at light saturation. Enhanced rates of photorespiration could also be involved in preventing reactive oxygen species formation in chloroplasts and, thus, in protecting PS II from damage. Accumulation of Gly and Ser in leaves indeed indicates increasing rates of photorespiration. Since Ser and Gly are both immediate precursors of GSH that can limit GSH synthesis, it is concluded that the salt-induced accumulation of leaf GSH results from enhanced photorespiration and is thus probably restricted to the cytosol.
• Geiger, D., Scherzer, S., Mumm, P., Marten, I., Ache, P., Matschi, S., Liese, A., Wellmann, C., Al-Rasheid, K.A.S., Grill, E., Romeis, T., Hedrich, R. (2010) Guard cell anion channel SLAC1 is regulated by CDPK protein kinases with distinct Ca2+ affinities, Proc Natl Acad Sci U S A, 107, 8023–8, available: https://doi.org/10.1073/pnas.0912030107.
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  @article{RN20, author = {Geiger, D. and Scherzer, S. and Mumm, P. and Marten, I. and Ache, P. and Matschi, S. and Liese, A. and Wellmann, C. and Al-Rasheid, K. A. S. and Grill, E. and Romeis, T. and Hedrich, R.}, journal = {Proc Natl Acad Sci U S A}, keywords = {myown}, pages = {8023-8}, title = {Guard cell anion channel SLAC1 is regulated by CDPK protein kinases with distinct Ca2+ affinities}, type = {Journal Article}, volume = 107, year = 2010 }

  %0 Journal Article %1 RN20 %A Geiger, D. %A Scherzer, S. %A Mumm, P. %A Marten, I. %A Ache, P. %A Matschi, S. %A Liese, A. %A Wellmann, C. %A Al-Rasheid, K. A. S. %A Grill, E. %A Romeis, T. %A Hedrich, R. %D 2010 %J Proc Natl Acad Sci U S A %P 8023-8 %R 10.1073/pnas.0912030107 %T Guard cell anion channel SLAC1 is regulated by CDPK protein kinases with distinct Ca2+ affinities %U http://www.ncbi.nlm.nih.gov/pubmed/20385816 %V 107
• Ache, P., Bauer, H., Kollist, H., Al-Rasheid, K.A.S., Lautner, S., Hartung, W., Hedrich, R. (2010) Stomatal action directly feeds back on leaf turgor: new insights into the regulation of the plant water status from non-invasive pressure probe measurements, Plant J, 62, 1072–82, available: https://doi.org/10.1111/j.1365-313X.2010.04213.x.
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  @article{RN1, author = {Ache, P. and Bauer, H. and Kollist, H. and Al-Rasheid, K. A. S. and Lautner, S. and Hartung, W. and Hedrich, R.}, journal = {Plant J}, keywords = {myown}, pages = {1072-82}, title = {Stomatal action directly feeds back on leaf turgor: new insights into the regulation of the plant water status from non-invasive pressure probe measurements}, type = {Journal Article}, volume = 62, year = 2010 }

  %0 Journal Article %1 RN1 %A Ache, P. %A Bauer, H. %A Kollist, H. %A Al-Rasheid, K. A. S. %A Lautner, S. %A Hartung, W. %A Hedrich, R. %D 2010 %J Plant J %P 1072-82 %R 10.1111/j.1365-313X.2010.04213.x %T Stomatal action directly feeds back on leaf turgor: new insights into the regulation of the plant water status from non-invasive pressure probe measurements %U http://www.ncbi.nlm.nih.gov/pubmed/20345603 %V 62

• Geiger, D., Scherzer, S., Mumm, P., Stange, A., Marten, I., Bauer, H., Ache, P., Matschi, S., Liese, A., Al-Rasheid, K.A.S., Romeis, T., Hedrich, R. (2009) Activity of guard cell anion channel SLAC1 is controlled by drought-stress signaling kinase-phosphatase pair, Proc Natl Acad Sci U S A, 106, 21425–30, available: https://doi.org/10.1073/pnas.0912021106.
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  @article{RN21, author = {Geiger, D. and Scherzer, S. and Mumm, P. and Stange, A. and Marten, I. and Bauer, H. and Ache, P. and Matschi, S. and Liese, A. and Al-Rasheid, K. A. S. and Romeis, T. and Hedrich, R.}, journal = {Proc Natl Acad Sci U S A}, keywords = {myown}, pages = {21425-30}, title = {Activity of guard cell anion channel SLAC1 is controlled by drought-stress signaling kinase-phosphatase pair}, type = {Journal Article}, volume = 106, year = 2009 }

  %0 Journal Article %1 RN21 %A Geiger, D. %A Scherzer, S. %A Mumm, P. %A Stange, A. %A Marten, I. %A Bauer, H. %A Ache, P. %A Matschi, S. %A Liese, A. %A Al-Rasheid, K. A. S. %A Romeis, T. %A Hedrich, R. %D 2009 %J Proc Natl Acad Sci U S A %P 21425-30 %R 10.1073/pnas.0912021106 %T Activity of guard cell anion channel SLAC1 is controlled by drought-stress signaling kinase-phosphatase pair %U http://www.ncbi.nlm.nih.gov/pubmed/19955405 %V 106
• Escalante-Perez, M., Lautner, S., Nehls, U., Selle, A., Teuber, M., Schnitzler, J.P., Teichmann, T., Fayyaz, P., Hartung, W., Polle, A., Fromm, J., Hedrich, R., Ache, P. (2009) Salt stress affects xylem differentiation of grey poplar (Populus x canescens), Planta, 229, 299–309, available: https://doi.org/10.1007/s00425-008-0829-7.
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  @article{RN18, author = {Escalante-Perez, M. and Lautner, S. and Nehls, U. and Selle, A. and Teuber, M. and Schnitzler, J. P. and Teichmann, T. and Fayyaz, P. and Hartung, W. and Polle, A. and Fromm, J. and Hedrich, R. and Ache, P.}, journal = {Planta}, keywords = {myown}, pages = {299-309}, title = {Salt stress affects xylem differentiation of grey poplar (Populus x canescens)}, type = {Journal Article}, volume = 229, year = 2009 }

  %0 Journal Article %1 RN18 %A Escalante-Perez, M. %A Lautner, S. %A Nehls, U. %A Selle, A. %A Teuber, M. %A Schnitzler, J. P. %A Teichmann, T. %A Fayyaz, P. %A Hartung, W. %A Polle, A. %A Fromm, J. %A Hedrich, R. %A Ache, P. %D 2009 %J Planta %P 299-309 %R 10.1007/s00425-008-0829-7 %T Salt stress affects xylem differentiation of grey poplar (Populus x canescens) %U http://www.ncbi.nlm.nih.gov/pubmed/18946679 %V 229

• Teuber, M., Zimmer, I., Kreuzwieser, J., Ache, P., Polle, A., Rennenberg, H., Schnitzler, J.P. (2008) VOC emissions of Grey poplar leaves as affected by salt stress and different N sources, Plant Biol, 10, 86–96, available: https://doi.org/10.1111/j.1438-8677.2007.00015.x.
  • [ Abstract ]
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  Nitrogen nutrition and salt stress experiments were performed in a greenhouse with hydroponic-cultured, salt-sensitive Grey poplar (Populus x canescens) plants to study the combined influence of different N sources (either 1 mm NO(3) (-) or NH(4)(+)) and salt (up to 75 mm NaCl) on leaf gas exchange, isoprene biosynthesis and VOC emissions. Net assimilation and transpiration proved to be highly sensitive to salt stress and were reduced by approximately 90% at leaf sodium concentrations higher than 1,800 microg Na g dry weight (dw)(-1). In contrast, emissions of isoprene and oxygenated VOC (i.e. acetaldehyde, formaldehyde and acetone) were unaffected. There was no significant effect of combinations of salt stress and N source, and neither NO(3)(-) or NH(4)(+) influenced the salt stress response in the Grey poplar leaves. Also, transcript levels of 1-deoxy-d-xylulose 5-phosphate reductoisomerase (PcDXR) and isoprene synthase (PcISPS) did not respond to the different N sources and only responded slightly to salt application, although isoprene synthase (PcISPS) activity was negatively affected at least in one of two experiments, despite high isoprene emission rates. A significant salt effect was the strong reduction of leaf dimethylallyl diphosphate (DMADP) content, probably due to restricted availability of photosynthates for DMADP biosynthesis. Further consequences of reduced photosynthetic gas exchange and maintaining VOC emissions are a very high C loss, up to 50%, from VOC emissions related to net CO(2) uptake and a strong increase in leaf internal isoprene concentrations, with maximum mean values up to 6.6 microl x l(-1). Why poplar leaves maintain VOC biosynthesis and emission under salt stress conditions, despite impaired photosynthetic CO(2) fixation, is discussed.

  @article{Teuber:2008:Plant-Biol-Stuttg:18211549, abstract = {Nitrogen nutrition and salt stress experiments were performed in a greenhouse with hydroponic-cultured, salt-sensitive Grey poplar (Populus x canescens) plants to study the combined influence of different N sources (either 1 mm NO(3) (-) or NH(4)(+)) and salt (up to 75 mm NaCl) on leaf gas exchange, isoprene biosynthesis and VOC emissions. Net assimilation and transpiration proved to be highly sensitive to salt stress and were reduced by approximately 90% at leaf sodium concentrations higher than 1,800 microg Na g dry weight (dw)(-1). In contrast, emissions of isoprene and oxygenated VOC (i.e. acetaldehyde, formaldehyde and acetone) were unaffected. There was no significant effect of combinations of salt stress and N source, and neither NO(3)(-) or NH(4)(+) influenced the salt stress response in the Grey poplar leaves. Also, transcript levels of 1-deoxy-d-xylulose 5-phosphate reductoisomerase (PcDXR) and isoprene synthase (PcISPS) did not respond to the different N sources and only responded slightly to salt application, although isoprene synthase (PcISPS) activity was negatively affected at least in one of two experiments, despite high isoprene emission rates. A significant salt effect was the strong reduction of leaf dimethylallyl diphosphate (DMADP) content, probably due to restricted availability of photosynthates for DMADP biosynthesis. Further consequences of reduced photosynthetic gas exchange and maintaining VOC emissions are a very high C loss, up to 50%, from VOC emissions related to net CO(2) uptake and a strong increase in leaf internal isoprene concentrations, with maximum mean values up to 6.6 microl x l(-1). Why poplar leaves maintain VOC biosynthesis and emission under salt stress conditions, despite impaired photosynthetic CO(2) fixation, is discussed.}, author = {Teuber, M and Zimmer, I and Kreuzwieser, J and Ache, P and Polle, A and Rennenberg, H and Schnitzler, J P}, journal = {Plant Biol}, keywords = {myown}, month = {jan}, pages = {86-96}, title = {VOC emissions of Grey poplar leaves as affected by salt stress and different N sources}, volume = 10, year = 2008 }

  %0 Journal Article %1 Teuber:2008:Plant-Biol-Stuttg:18211549 %A Teuber, M %A Zimmer, I %A Kreuzwieser, J %A Ache, P %A Polle, A %A Rennenberg, H %A Schnitzler, J P %D 2008 %J Plant Biol %P 86-96 %R 10.1111/j.1438-8677.2007.00015.x %T VOC emissions of Grey poplar leaves as affected by salt stress and different N sources %U https://www.ncbi.nlm.nih.gov/pubmed/18211549 %V 10 %X Nitrogen nutrition and salt stress experiments were performed in a greenhouse with hydroponic-cultured, salt-sensitive Grey poplar (Populus x canescens) plants to study the combined influence of different N sources (either 1 mm NO(3) (-) or NH(4)(+)) and salt (up to 75 mm NaCl) on leaf gas exchange, isoprene biosynthesis and VOC emissions. Net assimilation and transpiration proved to be highly sensitive to salt stress and were reduced by approximately 90% at leaf sodium concentrations higher than 1,800 microg Na g dry weight (dw)(-1). In contrast, emissions of isoprene and oxygenated VOC (i.e. acetaldehyde, formaldehyde and acetone) were unaffected. There was no significant effect of combinations of salt stress and N source, and neither NO(3)(-) or NH(4)(+) influenced the salt stress response in the Grey poplar leaves. Also, transcript levels of 1-deoxy-d-xylulose 5-phosphate reductoisomerase (PcDXR) and isoprene synthase (PcISPS) did not respond to the different N sources and only responded slightly to salt application, although isoprene synthase (PcISPS) activity was negatively affected at least in one of two experiments, despite high isoprene emission rates. A significant salt effect was the strong reduction of leaf dimethylallyl diphosphate (DMADP) content, probably due to restricted availability of photosynthates for DMADP biosynthesis. Further consequences of reduced photosynthetic gas exchange and maintaining VOC emissions are a very high C loss, up to 50%, from VOC emissions related to net CO(2) uptake and a strong increase in leaf internal isoprene concentrations, with maximum mean values up to 6.6 microl x l(-1). Why poplar leaves maintain VOC biosynthesis and emission under salt stress conditions, despite impaired photosynthetic CO(2) fixation, is discussed.
• Deeken, R., Ache, P., Kajahn, I., Klinkenberg, J., Bringmann, G., Hedrich, R. (2008) Identification of Arabidopsis thaliana phloem RNAs provides a search criterion for phloem-based transcripts hidden in complex datasets of microarray experiments, Plant J, 55, 746–59, available: https://doi.org/10.1111/j.1365-313X.2008.03555.x.
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  @article{RN11, author = {Deeken, R. and Ache, P. and Kajahn, I. and Klinkenberg, J. and Bringmann, G. and Hedrich, R.}, journal = {Plant J}, keywords = {myown}, pages = {746-59}, title = {Identification of Arabidopsis thaliana phloem RNAs provides a search criterion for phloem-based transcripts hidden in complex datasets of microarray experiments}, type = {Journal Article}, volume = 55, year = 2008 }

  %0 Journal Article %1 RN11 %A Deeken, R. %A Ache, P. %A Kajahn, I. %A Klinkenberg, J. %A Bringmann, G. %A Hedrich, R. %D 2008 %J Plant J %P 746-59 %R 10.1111/j.1365-313X.2008.03555.x %T Identification of Arabidopsis thaliana phloem RNAs provides a search criterion for phloem-based transcripts hidden in complex datasets of microarray experiments %U http://www.ncbi.nlm.nih.gov/pubmed/18485061 %V 55

• Latz, A., Ivashikina, N., Fischer, S., Ache, P., Sano, T., Becker, D., Deeken, R., Hedrich, R. (2007) In planta AKT2 subunits constitute a pH- and Ca2+-sensitive inward rectifying K+ channel, Planta, 225, 1179–91, available: https://doi.org/10.1007/s00425-006-0428-4.
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  @article{RN29, author = {Latz, A. and Ivashikina, N. and Fischer, S. and Ache, P. and Sano, T. and Becker, D. and Deeken, R. and Hedrich, R.}, journal = {Planta}, keywords = {myown}, pages = {1179-91}, title = {In planta AKT2 subunits constitute a pH- and Ca2+-sensitive inward rectifying K+ channel}, type = {Journal Article}, volume = 225, year = 2007 }

  %0 Journal Article %1 RN29 %A Latz, A. %A Ivashikina, N. %A Fischer, S. %A Ache, P. %A Sano, T. %A Becker, D. %A Deeken, R. %A Hedrich, R. %D 2007 %J Planta %P 1179-91 %R 10.1007/s00425-006-0428-4 %T In planta AKT2 subunits constitute a pH- and Ca2+-sensitive inward rectifying K+ channel %U http://www.ncbi.nlm.nih.gov/pubmed/17146665 %V 225
• Zimmermann, D., Westhoff, M., Zimmermann, G., Gessner, P., Gessner, A., Wegner, L.H., Rokitta, M., Ache, P., Schneider, H., Vasquez, J.A., Kruck, W., Shirley, S., Jakob, P., Hedrich, R., Bentrup, F.W., Bamberg, E., Zimmermann, U. (2007) Foliar water supply of tall trees: evidence for mucilage-facilitated moisture uptake from the atmosphere and the impact on pressure bomb measurements, Protoplasma, 232, 11–34, available: https://doi.org/10.1007/s00709-007-0279-2.
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  @article{RN39, author = {Zimmermann, D. and Westhoff, M. and Zimmermann, G. and Gessner, P. and Gessner, A. and Wegner, L. H. and Rokitta, M. and Ache, P. and Schneider, H. and Vasquez, J. A. and Kruck, W. and Shirley, S. and Jakob, P. and Hedrich, R. and Bentrup, F. W. and Bamberg, E. and Zimmermann, U.}, journal = {Protoplasma}, keywords = {myown}, pages = {11-34}, title = {Foliar water supply of tall trees: evidence for mucilage-facilitated moisture uptake from the atmosphere and the impact on pressure bomb measurements}, type = {Journal Article}, volume = 232, year = 2007 }

  %0 Journal Article %1 RN39 %A Zimmermann, D. %A Westhoff, M. %A Zimmermann, G. %A Gessner, P. %A Gessner, A. %A Wegner, L. H. %A Rokitta, M. %A Ache, P. %A Schneider, H. %A Vasquez, J. A. %A Kruck, W. %A Shirley, S. %A Jakob, P. %A Hedrich, R. %A Bentrup, F. W. %A Bamberg, E. %A Zimmermann, U. %D 2007 %J Protoplasma %P 11-34 %R 10.1007/s00709-007-0279-2 %T Foliar water supply of tall trees: evidence for mucilage-facilitated moisture uptake from the atmosphere and the impact on pressure bomb measurements %U http://www.ncbi.nlm.nih.gov/pubmed/18176835 %V 232

• Niewiadomski, P., Knappe, S., Geimer, S., Fischer, K., Schulz, B., Unte, U.S., Rosso, M.G., Ache, P., Fl{"u}gge, U.I., Schneider, A. (2005) The Arabidopsis plastidic glucose 6-phosphate/phosphate translocator GPT1 is essential for pollen maturation and embryo sac development, Plant Cell, 17, 760–775, available: https://doi.org/10.1105/tpc.104.029124.
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  Plastids of nongreen tissues can import carbon in the form of glucose 6-phosphate via the glucose 6-phosphate/phosphate translocator (GPT). The Arabidopsis thaliana genome contains two homologous GPT genes, AtGPT1 and AtGPT2. Both proteins show glucose 6-phosphate translocator activity after reconstitution in liposomes, and each of them can rescue the low-starch leaf phenotype of the pgi1 mutant (which lacks plastid phosphoglucoisomerase), indicating that the two proteins are also functional in planta. AtGPT1 transcripts are ubiquitously expressed during plant development, with highest expression in stamens, whereas AtGPT2 expression is restricted to a few tissues, including senescing leaves. Disruption of GPT2 has no obvious effect on growth and development under greenhouse conditions, whereas the mutations gpt1-1 and gpt1-2 are lethal. In both gpt1 lines, distorted segregation ratios, reduced efficiency of transmission in males and females, and inability to complete pollen and ovule development were observed, indicating profound defects in gametogenesis. Embryo sac development is arrested in the gpt1 mutants at a stage before the fusion of the polar nuclei. Mutant pollen development is associated with reduced formation of lipid bodies and small vesicles and the disappearance of dispersed vacuoles, which results in disintegration of the pollen structure. Taken together, our results indicate that GPT1-mediated import of glucose 6-phosphate into nongreen plastids is crucial for gametophyte development. We suggest that loss of GPT1 function results in disruption of the oxidative pentose phosphate cycle, which in turn affects fatty acid biosynthesis.

  @article{Niewiadomski:2005:Plant-Cell:15722468, abstract = {Plastids of nongreen tissues can import carbon in the form of glucose 6-phosphate via the glucose 6-phosphate/phosphate translocator (GPT). The Arabidopsis thaliana genome contains two homologous GPT genes, AtGPT1 and AtGPT2. Both proteins show glucose 6-phosphate translocator activity after reconstitution in liposomes, and each of them can rescue the low-starch leaf phenotype of the pgi1 mutant (which lacks plastid phosphoglucoisomerase), indicating that the two proteins are also functional in planta. AtGPT1 transcripts are ubiquitously expressed during plant development, with highest expression in stamens, whereas AtGPT2 expression is restricted to a few tissues, including senescing leaves. Disruption of GPT2 has no obvious effect on growth and development under greenhouse conditions, whereas the mutations gpt1-1 and gpt1-2 are lethal. In both gpt1 lines, distorted segregation ratios, reduced efficiency of transmission in males and females, and inability to complete pollen and ovule development were observed, indicating profound defects in gametogenesis. Embryo sac development is arrested in the gpt1 mutants at a stage before the fusion of the polar nuclei. Mutant pollen development is associated with reduced formation of lipid bodies and small vesicles and the disappearance of dispersed vacuoles, which results in disintegration of the pollen structure. Taken together, our results indicate that GPT1-mediated import of glucose 6-phosphate into nongreen plastids is crucial for gametophyte development. We suggest that loss of GPT1 function results in disruption of the oxidative pentose phosphate cycle, which in turn affects fatty acid biosynthesis.}, author = {Niewiadomski, P and Knappe, S and Geimer, S and Fischer, K and Schulz, B and Unte, U S and Rosso, M G and Ache, P and Fl{\"u}gge, U I and Schneider, A}, journal = {Plant Cell}, keywords = {myown}, month = {mar}, pages = {760-775}, title = {The Arabidopsis plastidic glucose 6-phosphate/phosphate translocator GPT1 is essential for pollen maturation and embryo sac development}, volume = 17, year = 2005 }

  %0 Journal Article %1 Niewiadomski:2005:Plant-Cell:15722468 %A Niewiadomski, P %A Knappe, S %A Geimer, S %A Fischer, K %A Schulz, B %A Unte, U S %A Rosso, M G %A Ache, P %A Fl{"u}gge, U I %A Schneider, A %D 2005 %J Plant Cell %P 760-775 %R 10.1105/tpc.104.029124 %T The Arabidopsis plastidic glucose 6-phosphate/phosphate translocator GPT1 is essential for pollen maturation and embryo sac development %U https://www.ncbi.nlm.nih.gov/pubmed/15722468 %V 17 %X Plastids of nongreen tissues can import carbon in the form of glucose 6-phosphate via the glucose 6-phosphate/phosphate translocator (GPT). The Arabidopsis thaliana genome contains two homologous GPT genes, AtGPT1 and AtGPT2. Both proteins show glucose 6-phosphate translocator activity after reconstitution in liposomes, and each of them can rescue the low-starch leaf phenotype of the pgi1 mutant (which lacks plastid phosphoglucoisomerase), indicating that the two proteins are also functional in planta. AtGPT1 transcripts are ubiquitously expressed during plant development, with highest expression in stamens, whereas AtGPT2 expression is restricted to a few tissues, including senescing leaves. Disruption of GPT2 has no obvious effect on growth and development under greenhouse conditions, whereas the mutations gpt1-1 and gpt1-2 are lethal. In both gpt1 lines, distorted segregation ratios, reduced efficiency of transmission in males and females, and inability to complete pollen and ovule development were observed, indicating profound defects in gametogenesis. Embryo sac development is arrested in the gpt1 mutants at a stage before the fusion of the polar nuclei. Mutant pollen development is associated with reduced formation of lipid bodies and small vesicles and the disappearance of dispersed vacuoles, which results in disintegration of the pollen structure. Taken together, our results indicate that GPT1-mediated import of glucose 6-phosphate into nongreen plastids is crucial for gametophyte development. We suggest that loss of GPT1 function results in disruption of the oxidative pentose phosphate cycle, which in turn affects fatty acid biosynthesis.
• Arend, M., Stinzing, A., Wind, C., Langer, K., Latz, A., Ache, P., Fromm, J., Hedrich, R. (2005) Polar-localised poplar K+ channel capable of controlling electrical properties of wood-forming cells, Planta, 223, 140–8, available: https://doi.org/10.1007/s00425-005-0122-y.
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  @article{RN6, author = {Arend, M. and Stinzing, A. and Wind, C. and Langer, K. and Latz, A. and Ache, P. and Fromm, J. and Hedrich, R.}, journal = {Planta}, keywords = {myown}, pages = {140-8}, title = {Polar-localised poplar K+ channel capable of controlling electrical properties of wood-forming cells}, type = {Journal Article}, volume = 223, year = 2005 }

  %0 Journal Article %1 RN6 %A Arend, M. %A Stinzing, A. %A Wind, C. %A Langer, K. %A Latz, A. %A Ache, P. %A Fromm, J. %A Hedrich, R. %D 2005 %J Planta %P 140-8 %R 10.1007/s00425-005-0122-y %T Polar-localised poplar K+ channel capable of controlling electrical properties of wood-forming cells %U http://www.ncbi.nlm.nih.gov/pubmed/16258747 %V 223
• Ivashikina, N., Deeken, R., Fischer, S., Ache, P., Hedrich, R. (2005) AKT2/3 subunits render guard cell K+ channels Ca2+ sensitive, J Gen Physiol, 125, 483–92, available: https://doi.org/10.1085/jgp.200409211.
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  @article{RN24, author = {Ivashikina, N. and Deeken, R. and Fischer, S. and Ache, P. and Hedrich, R.}, journal = {J Gen Physiol}, keywords = {myown}, pages = {483-92}, title = {AKT2/3 subunits render guard cell K+ channels Ca2+ sensitive}, type = {Journal Article}, volume = 125, year = 2005 }

  %0 Journal Article %1 RN24 %A Ivashikina, N. %A Deeken, R. %A Fischer, S. %A Ache, P. %A Hedrich, R. %D 2005 %J J Gen Physiol %P 483-92 %R 10.1085/jgp.200409211 %T AKT2/3 subunits render guard cell K+ channels Ca2+ sensitive %U http://www.ncbi.nlm.nih.gov/pubmed/15824192 %V 125
• Buchsenschutz, K., Marten, I., Becker, D., Philippar, K., Ache, P., Hedrich, R. (2005) Differential expression of K+ channels between guard cells and subsidiary cells within the maize stomatal complex, Planta, 222, 968–76, available: https://doi.org/10.1007/s00425-005-0038-6.
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  @article{RN10, author = {Buchsenschutz, K. and Marten, I. and Becker, D. and Philippar, K. and Ache, P. and Hedrich, R.}, journal = {Planta}, keywords = {myown}, pages = {968-76}, title = {Differential expression of K+ channels between guard cells and subsidiary cells within the maize stomatal complex}, type = {Journal Article}, volume = 222, year = 2005 }

  %0 Journal Article %1 RN10 %A Buchsenschutz, K. %A Marten, I. %A Becker, D. %A Philippar, K. %A Ache, P. %A Hedrich, R. %D 2005 %J Planta %P 968-76 %R 10.1007/s00425-005-0038-6 %T Differential expression of K+ channels between guard cells and subsidiary cells within the maize stomatal complex %U http://www.ncbi.nlm.nih.gov/pubmed/16021501 %V 222

• Langer, K., Levchenko, V., Fromm, J., Geiger, D., Steinmeyer, R., Lautner, S., Ache, P., Hedrich, R. (2004) The poplar K+ channel KPT1 is associated with K+ uptake during stomatal opening and bud development, Plant J, 37, 828–38, available: http://www.ncbi.nlm.nih.gov/pubmed/14996212.
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  @article{RN27, author = {Langer, K. and Levchenko, V. and Fromm, J. and Geiger, D. and Steinmeyer, R. and Lautner, S. and Ache, P. and Hedrich, R.}, journal = {Plant J}, keywords = {myown}, pages = {828-38}, title = {The poplar K+ channel KPT1 is associated with K+ uptake during stomatal opening and bud development}, type = {Journal Article}, volume = 37, year = 2004 }

  %0 Journal Article %1 RN27 %A Langer, K. %A Levchenko, V. %A Fromm, J. %A Geiger, D. %A Steinmeyer, R. %A Lautner, S. %A Ache, P. %A Hedrich, R. %D 2004 %J Plant J %P 828-38 %T The poplar K+ channel KPT1 is associated with K+ uptake during stomatal opening and bud development %U http://www.ncbi.nlm.nih.gov/pubmed/14996212 %V 37
• Philippar, K., Ivashikina, N., Ache, P., Christian, M., Luthen, H., Palme, K., Hedrich, R. (2004) Auxin activates KAT1 and KAT2, two K+-channel genes expressed in seedlings of Arabidopsis thaliana, Plant J, 37, 815–27, available: http://www.ncbi.nlm.nih.gov/pubmed/14996216.
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  @article{RN32, author = {Philippar, K. and Ivashikina, N. and Ache, P. and Christian, M. and Luthen, H. and Palme, K. and Hedrich, R.}, journal = {Plant J}, keywords = {myown}, pages = {815-27}, title = {Auxin activates KAT1 and KAT2, two K+-channel genes expressed in seedlings of Arabidopsis thaliana}, type = {Journal Article}, volume = 37, year = 2004 }

  %0 Journal Article %1 RN32 %A Philippar, K. %A Ivashikina, N. %A Ache, P. %A Christian, M. %A Luthen, H. %A Palme, K. %A Hedrich, R. %D 2004 %J Plant J %P 815-27 %T Auxin activates KAT1 and KAT2, two K+-channel genes expressed in seedlings of Arabidopsis thaliana %U http://www.ncbi.nlm.nih.gov/pubmed/14996216 %V 37

• Stadler, R., Buttner, M., Ache, P., Hedrich, R., Ivashikina, N., Melzer, M., Shearson, S.M., Smith, S.M., Sauer, N. (2003) Diurnal and light-regulated expression of AtSTP1 in guard cells of Arabidopsis, Plant Physol, 133, 528–37, available: https://doi.org/10.1104/pp.103.024240.
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  @article{RN37, author = {Stadler, R. and Buttner, M. and Ache, P. and Hedrich, R. and Ivashikina, N. and Melzer, M. and Shearson, S. M. and Smith, S. M. and Sauer, N.}, journal = {Plant Physol}, keywords = {myown}, pages = {528-37}, title = {Diurnal and light-regulated expression of AtSTP1 in guard cells of Arabidopsis}, type = {Journal Article}, volume = 133, year = 2003 }

  %0 Journal Article %1 RN37 %A Stadler, R. %A Buttner, M. %A Ache, P. %A Hedrich, R. %A Ivashikina, N. %A Melzer, M. %A Shearson, S. M. %A Smith, S. M. %A Sauer, N. %D 2003 %J Plant Physol %P 528-37 %R 10.1104/pp.103.024240 %T Diurnal and light-regulated expression of AtSTP1 in guard cells of Arabidopsis %U http://www.ncbi.nlm.nih.gov/pubmed/12972665 %V 133
• Ivashikina, N., Deeken, R., Ache, P., Kranz, E., Pommerrenig, B., Sauer, N., Hedrich, R. (2003) Isolation of AtSUC2 promoter-GFP-marked companion cells for patch-clamp studies and expression profiling, Plant J, 36, 931–45, available: http://www.ncbi.nlm.nih.gov/pubmed/14675456.
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  @article{RN23, author = {Ivashikina, N. and Deeken, R. and Ache, P. and Kranz, E. and Pommerrenig, B. and Sauer, N. and Hedrich, R.}, journal = {Plant J}, keywords = {myown}, pages = {931-45}, title = {Isolation of AtSUC2 promoter-GFP-marked companion cells for patch-clamp studies and expression profiling}, type = {Journal Article}, volume = 36, year = 2003 }

  %0 Journal Article %1 RN23 %A Ivashikina, N. %A Deeken, R. %A Ache, P. %A Kranz, E. %A Pommerrenig, B. %A Sauer, N. %A Hedrich, R. %D 2003 %J Plant J %P 931-45 %T Isolation of AtSUC2 promoter-GFP-marked companion cells for patch-clamp studies and expression profiling %U http://www.ncbi.nlm.nih.gov/pubmed/14675456 %V 36
• Becker, D., Hoth, S., Ache, P., Wenkel, S., Roelfsema, M.R., Meyerhoff, O., Hartung, W., Hedrich, R. (2003) Regulation of the ABA-sensitive Arabidopsis potassium channel gene GORK in response to water stress, FEBS Lett, 554, 119–26, available: https://www.ncbi.nlm.nih.gov/pubmed/14596925.
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  @article{RN9, author = {Becker, D. and Hoth, S. and Ache, P. and Wenkel, S. and Roelfsema, M. R. and Meyerhoff, O. and Hartung, W. and Hedrich, R.}, journal = {FEBS Lett}, keywords = {myown}, pages = {119-26}, title = {Regulation of the ABA-sensitive Arabidopsis potassium channel gene GORK in response to water stress}, type = {Journal Article}, volume = 554, year = 2003 }

  %0 Journal Article %1 RN9 %A Becker, D. %A Hoth, S. %A Ache, P. %A Wenkel, S. %A Roelfsema, M. R. %A Meyerhoff, O. %A Hartung, W. %A Hedrich, R. %D 2003 %J FEBS Lett %P 119-26 %T Regulation of the ABA-sensitive Arabidopsis potassium channel gene GORK in response to water stress %U https://www.ncbi.nlm.nih.gov/pubmed/14596925 %V 554
• Deeken, R., Ivashikina, N., Czirjak, T., Philippar, K., Becker, D., Ache, P., Hedrich, R. (2003) Tumour development in Arabidopsis thaliana involves the Shaker-like K+ channels AKT1 and AKT2/3, Plant J, 34, 778–87, available: http://www.ncbi.nlm.nih.gov/pubmed/12795698.
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  @article{RN13, author = {Deeken, R. and Ivashikina, N. and Czirjak, T. and Philippar, K. and Becker, D. and Ache, P. and Hedrich, R.}, journal = {Plant J}, keywords = {myown}, pages = {778-87}, title = {Tumour development in Arabidopsis thaliana involves the Shaker-like K+ channels AKT1 and AKT2/3}, type = {Journal Article}, volume = 34, year = 2003 }

  %0 Journal Article %1 RN13 %A Deeken, R. %A Ivashikina, N. %A Czirjak, T. %A Philippar, K. %A Becker, D. %A Ache, P. %A Hedrich, R. %D 2003 %J Plant J %P 778-87 %T Tumour development in Arabidopsis thaliana involves the Shaker-like K+ channels AKT1 and AKT2/3 %U http://www.ncbi.nlm.nih.gov/pubmed/12795698 %V 34

• Langer, K., Ache, P., Geiger, D., Stinzing, A., Arend, M., Wind, C., Regan, S., Fromm, J., Hedrich, R. (2002) Poplar potassium transporters capable of controlling K+ homeostasis and K+-dependent xylogenesis, Plant J, 32, 997–1009, available: http://www.ncbi.nlm.nih.gov/pubmed/12492841.
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  @article{RN26, author = {Langer, K. and Ache, P. and Geiger, D. and Stinzing, A. and Arend, M. and Wind, C. and Regan, S. and Fromm, J. and Hedrich, R.}, journal = {Plant J}, keywords = {myown}, pages = {997-1009}, title = {Poplar potassium transporters capable of controlling K+ homeostasis and K+-dependent xylogenesis}, type = {Journal Article}, volume = 32, year = 2002 }

  %0 Journal Article %1 RN26 %A Langer, K. %A Ache, P. %A Geiger, D. %A Stinzing, A. %A Arend, M. %A Wind, C. %A Regan, S. %A Fromm, J. %A Hedrich, R. %D 2002 %J Plant J %P 997-1009 %T Poplar potassium transporters capable of controlling K+ homeostasis and K+-dependent xylogenesis %U http://www.ncbi.nlm.nih.gov/pubmed/12492841 %V 32
• Reintanz, B., Szyroki, A., Ivashikina, N., Ache, P., Godde, M., Becker, D., Palme, K., Hedrich, R. (2002) AtKC1, a silent Arabidopsis potassium channel alpha -subunit modulates root hair K+ influx, Proc Natl Acad Sci U S A, 99, 4079–84, available: https://doi.org/10.1073/pnas.052677799.
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  @article{RN34, author = {Reintanz, B. and Szyroki, A. and Ivashikina, N. and Ache, P. and Godde, M. and Becker, D. and Palme, K. and Hedrich, R.}, journal = {Proc Natl Acad Sci U S A}, keywords = {myown}, pages = {4079-84}, title = {AtKC1, a silent Arabidopsis potassium channel alpha -subunit modulates root hair K+ influx}, type = {Journal Article}, volume = 99, year = 2002 }

  %0 Journal Article %1 RN34 %A Reintanz, B. %A Szyroki, A. %A Ivashikina, N. %A Ache, P. %A Godde, M. %A Becker, D. %A Palme, K. %A Hedrich, R. %D 2002 %J Proc Natl Acad Sci U S A %P 4079-84 %R 10.1073/pnas.052677799 %T AtKC1, a silent Arabidopsis potassium channel alpha -subunit modulates root hair K+ influx %U http://www.ncbi.nlm.nih.gov/pubmed/11904452 %V 99
• Schonknecht, G., Spoormaker, P., Steinmeyer, R., Bruggeman, L., Ache, P., Dutta, R., Reintanz, B., Godde, M., Hedrich, R., Palme, K. (2002) KCO1 is a component of the slow-vacuolar (SV) ion channel, FEBS lett, 511(1-3), 28–32, available: http://www.ncbi.nlm.nih.gov/pubmed/11821043.
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  @article{RN36, author = {Schonknecht, G. and Spoormaker, P. and Steinmeyer, R. and Bruggeman, L. and Ache, P. and Dutta, R. and Reintanz, B. and Godde, M. and Hedrich, R. and Palme, K.}, journal = {FEBS lett}, keywords = {myown}, number = {1-3}, pages = {28-32}, title = {KCO1 is a component of the slow-vacuolar (SV) ion channel}, type = {Journal Article}, volume = 511, year = 2002 }

  %0 Journal Article %1 RN36 %A Schonknecht, G. %A Spoormaker, P. %A Steinmeyer, R. %A Bruggeman, L. %A Ache, P. %A Dutta, R. %A Reintanz, B. %A Godde, M. %A Hedrich, R. %A Palme, K. %D 2002 %J FEBS lett %N 1-3 %P 28-32 %T KCO1 is a component of the slow-vacuolar (SV) ion channel %U http://www.ncbi.nlm.nih.gov/pubmed/11821043 %V 511
• Deeken, R., Geiger, D., Fromm, J., Koroleva, O., Ache, P., Langenfeld-Heyser, R., Sauer, N., May, S.T., Hedrich, R. (2002) Loss of the AKT2/3 potassium channel affects sugar loading into the phloem of Arabidopsis, Planta, 216, 334–44, available: https://doi.org/10.1007/s00425-002-0895-1.
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  @article{RN12, author = {Deeken, R. and Geiger, D. and Fromm, J. and Koroleva, O. and Ache, P. and Langenfeld-Heyser, R. and Sauer, N. and May, S. T. and Hedrich, R.}, journal = {Planta}, keywords = {myown}, pages = {334-44}, title = {Loss of the AKT2/3 potassium channel affects sugar loading into the phloem of Arabidopsis}, type = {Journal Article}, volume = 216, year = 2002 }

  %0 Journal Article %1 RN12 %A Deeken, R. %A Geiger, D. %A Fromm, J. %A Koroleva, O. %A Ache, P. %A Langenfeld-Heyser, R. %A Sauer, N. %A May, S. T. %A Hedrich, R. %D 2002 %J Planta %P 334-44 %R 10.1007/s00425-002-0895-1 %T Loss of the AKT2/3 potassium channel affects sugar loading into the phloem of Arabidopsis %U http://www.ncbi.nlm.nih.gov/pubmed/12447548 %V 216

• Szyroki, A., Ivashikina, N., Dietrich, P., Roelfsema, M.R., Ache, P., Reintanz, B., Deeken, R., Godde, M., Felle, H., Steinmeyer, R., Palme, K., Hedrich, R. (2001) KAT1 is not essential for stomatal opening, Proc Natl Acad Sci U S A, 98, 2917–21, available: https://doi.org/10.1073/pnas.051616698.
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  @article{RN38, author = {Szyroki, A. and Ivashikina, N. and Dietrich, P. and Roelfsema, M. R. and Ache, P. and Reintanz, B. and Deeken, R. and Godde, M. and Felle, H. and Steinmeyer, R. and Palme, K. and Hedrich, R.}, journal = {Proc Natl Acad Sci U S A}, keywords = {myown}, pages = {2917-21}, title = {KAT1 is not essential for stomatal opening}, type = {Journal Article}, volume = 98, year = 2001 }

  %0 Journal Article %1 RN38 %A Szyroki, A. %A Ivashikina, N. %A Dietrich, P. %A Roelfsema, M. R. %A Ache, P. %A Reintanz, B. %A Deeken, R. %A Godde, M. %A Felle, H. %A Steinmeyer, R. %A Palme, K. %A Hedrich, R. %D 2001 %J Proc Natl Acad Sci U S A %P 2917-21 %R 10.1073/pnas.051616698 %T KAT1 is not essential for stomatal opening %U http://www.ncbi.nlm.nih.gov/pubmed/11226341 %V 98
• Ivashikina, N., Becker, D., Ache, P., Meyerhoff, O., Felle, H.H., Hedrich, R. (2001) K+ channel profile and electrical properties of Arabidopsis root hairs, FEBS Lett, 508, 463–9, available: https://www.ncbi.nlm.nih.gov/pubmed/11728473.
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  @article{RN22, author = {Ivashikina, N. and Becker, D. and Ache, P. and Meyerhoff, O. and Felle, H. H. and Hedrich, R.}, journal = {FEBS Lett}, keywords = {myown}, pages = {463-9}, title = {K+ channel profile and electrical properties of Arabidopsis root hairs}, type = {Journal Article}, volume = 508, year = 2001 }

  %0 Journal Article %1 RN22 %A Ivashikina, N. %A Becker, D. %A Ache, P. %A Meyerhoff, O. %A Felle, H. H. %A Hedrich, R. %D 2001 %J FEBS Lett %P 463-9 %T K+ channel profile and electrical properties of Arabidopsis root hairs %U https://www.ncbi.nlm.nih.gov/pubmed/11728473 %V 508
• Ache, P., Becker, D., Deeken, R., Dreyer, I., Weber, H., Fromm, J., Hedrich, R. (2001) VFK1, a Vicia faba K+ channel involved in phloem unloading, Plant J, 27, 571–80, available: http://www.ncbi.nlm.nih.gov/pubmed/11576440.
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  @article{RN2, author = {Ache, P. and Becker, D. and Deeken, R. and Dreyer, I. and Weber, H. and Fromm, J. and Hedrich, R.}, journal = {Plant J}, keywords = {myown}, pages = {571-80}, title = {VFK1, a Vicia faba K+ channel involved in phloem unloading}, type = {Journal Article}, volume = 27, year = 2001 }

  %0 Journal Article %1 RN2 %A Ache, P. %A Becker, D. %A Deeken, R. %A Dreyer, I. %A Weber, H. %A Fromm, J. %A Hedrich, R. %D 2001 %J Plant J %P 571-80 %T VFK1, a Vicia faba K+ channel involved in phloem unloading %U http://www.ncbi.nlm.nih.gov/pubmed/11576440 %V 27

• Downey, P., Szabo, I., Ivashikina, N., Negro, A., Guzzo, F., Ache, P., Hedrich, R., Terzi, M., Schiavo, F.L. (2000) KDC1, a novel carrot root hair K+ channel. Cloning, characterization, and expression in mammalian cells, J Biol Chem, 275, 39420–6, available: https://doi.org/10.1074/jbc.M002962200.
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  @article{RN15, author = {Downey, P. and Szabo, I. and Ivashikina, N. and Negro, A. and Guzzo, F. and Ache, P. and Hedrich, R. and Terzi, M. and Schiavo, F. L.}, journal = {J Biol Chem}, keywords = {myown}, pages = {39420-6}, title = {KDC1, a novel carrot root hair K+ channel. Cloning, characterization, and expression in mammalian cells}, type = {Journal Article}, volume = 275, year = 2000 }

  %0 Journal Article %1 RN15 %A Downey, P. %A Szabo, I. %A Ivashikina, N. %A Negro, A. %A Guzzo, F. %A Ache, P. %A Hedrich, R. %A Terzi, M. %A Schiavo, F. L. %D 2000 %J J Biol Chem %P 39420-6 %R 10.1074/jbc.M002962200 %T KDC1, a novel carrot root hair K+ channel. Cloning, characterization, and expression in mammalian cells %U http://www.ncbi.nlm.nih.gov/pubmed/10970888 %V 275
• Deeken, R., Sanders, C., Ache, P., Hedrich, R. (2000) Developmental and light-dependent regulation of a phloem-localised K+ channel of Arabidopsis thaliana, Plant J, 23, 285–90, available: http://www.ncbi.nlm.nih.gov/pubmed/10929122.
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  @article{RN14, author = {Deeken, R. and Sanders, C. and Ache, P. and Hedrich, R.}, journal = {Plant J}, keywords = {myown}, pages = {285-90}, title = {Developmental and light-dependent regulation of a phloem-localised K+ channel of Arabidopsis thaliana}, type = {Journal Article}, volume = 23, year = 2000 }

  %0 Journal Article %1 RN14 %A Deeken, R. %A Sanders, C. %A Ache, P. %A Hedrich, R. %D 2000 %J Plant J %P 285-90 %T Developmental and light-dependent regulation of a phloem-localised K+ channel of Arabidopsis thaliana %U http://www.ncbi.nlm.nih.gov/pubmed/10929122 %V 23
• Ache, P., Becker, D., Ivashikina, N., Dietrich, P., Roelfsema, M.R., Hedrich, R. (2000) GORK, a delayed outward rectifier expressed in guard cells of Arabidopsis thaliana, is a K+-selective, K+-sensing ion channel, FEBS Lett, 486, 93–8, available: https://www.ncbi.nlm.nih.gov/pubmed/11113445.
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  @article{RN3, author = {Ache, P. and Becker, D. and Ivashikina, N. and Dietrich, P. and Roelfsema, M. R. and Hedrich, R.}, journal = {FEBS Lett}, keywords = {myown}, pages = {93-8}, title = {GORK, a delayed outward rectifier expressed in guard cells of Arabidopsis thaliana, is a K+-selective, K+-sensing ion channel}, type = {Journal Article}, volume = 486, year = 2000 }

  %0 Journal Article %1 RN3 %A Ache, P. %A Becker, D. %A Ivashikina, N. %A Dietrich, P. %A Roelfsema, M. R. %A Hedrich, R. %D 2000 %J FEBS Lett %P 93-8 %T GORK, a delayed outward rectifier expressed in guard cells of Arabidopsis thaliana, is a K+-selective, K+-sensing ion channel %U https://www.ncbi.nlm.nih.gov/pubmed/11113445 %V 486

• Marten, I., Hoth, S., Deeken, R., Ache, P., Ketchum, K.A., Hoshi, T., Hedrich, R. (1999) AKT3, a phloem-localized K+ channel, is blocked by protons, Proc Natl Acad Sci U S A, 96, 7581–6, available: http://www.ncbi.nlm.nih.gov/pubmed/10377458.
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  @article{RN31, author = {Marten, I. and Hoth, S. and Deeken, R. and Ache, P. and Ketchum, K. A. and Hoshi, T. and Hedrich, R.}, journal = {Proc Natl Acad Sci U S A}, keywords = {myown}, pages = {7581-6}, title = {AKT3, a phloem-localized K+ channel, is blocked by protons}, type = {Journal Article}, volume = 96, year = 1999 }

  %0 Journal Article %1 RN31 %A Marten, I. %A Hoth, S. %A Deeken, R. %A Ache, P. %A Ketchum, K. A. %A Hoshi, T. %A Hedrich, R. %D 1999 %J Proc Natl Acad Sci U S A %P 7581-6 %T AKT3, a phloem-localized K+ channel, is blocked by protons %U http://www.ncbi.nlm.nih.gov/pubmed/10377458 %V 96