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    THE BIOCENTER OF THE UNIVERSITY OF WÜRZBURG

    Sucrose signalling and regulation of sucrose metabolism by trehalose 6-phosphate

    Sucrose signalling and regulation of sucrose metabolism by trehalose 6-phosphate
    Date: 05/09/2019, 5:15 PM - 6:30 PM
    Category: 87020000-Kalender, Kolloquium, JVS-Kolloquium
    Location: Julius-von-Sachs-Platz 2, Seminarpavillon des Julius-von-Sachs-Instituts
    Organizer: Biozentrum der Universität Würzburg, Julius-von-Sachs-Institut
    Speaker: John Lunn

    Trehalose 6-phosphate (Tre6P), the intermediate of trehalose biosynthesis, is an essential signal metabolite in plants that links developmental processes, such as flowering, shoot branching and embryogenesis, to the metabolic status of the plant. The sucrose-Tre6P nexus model postulates that Tre6P is both a signal and negative feedback regulator of sucrose levels in plant cells. The model envisages a role for Tre6P in sucrose homeostasis in plants that is analogous to that of insulin in the regulation of blood glucose levels in animals. In source leaves, Tre6P controls sucrose levels by regulating the partitioning of photoassimilates during the day and the turnover of transitory starch reserves at night. It also has a particularly important function in guard cells, affecting the sensitivity of stomata to abscisic acid. In sink organs, Tre6P regulates the import and utilization of sucrose for growth and the accumulation of storage reserves. We are using forward and reverse genetics approaches to dissect the functions of Tre6P in specific source and sink tissues, to understand the molecular mechanisms that underlie the sucrose-Tre6P nexus and how Tre6P links plant growth and development to the availability of sucrose.

    Kolloquium des Julius-von-Sachs-Instituts: 

    John Lunn

    Max Planck Institute of Molecular Plant Physiology, Am Mühlenberg 1, 14476 Potsdam-Golm, Germany

    Titel: " Sucrose signalling and regulation of sucrose metabolism by trehalose 6-phosphate"

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