Charlotte Kirchhelle, University of Lyon, France, will give a talk about "Edge-based growth control in plants".
A fundamental question in biology is how multicellular organisms robustly produce organ shapes. The underlying process of morphogenesis involves the integration of biochemical, genetic, and mechanical factors across multiple spatio-temporal scales. In plants, morphogenesis is dominated by the rigid cell wall, which fixes cells in their position. Adjacent cells must therefore coordinate their growth patterns, which are in turn controlled by the mechanical properties of the cell wall. Cell walls are assembled by a complex intracellular trafficking machinery that delivers cell wall components and their associated biosynthetic machinery to different subcellular regions.
We have recently discovered that a trafficking route directed to cell edges is essential for cell wall assembly and directional growth at the cell and organ scale. Edge-based growth regulation is independent of oriented cellulose deposition, the central paradigm of directional growth control in plants. In this talk, I will present our latest data and concepts for the molecular basis of edge-based growth control, and its relevance in a tissue context. We hypothesise that cell edges act both as rate-limiting regions for growth within a polyhedral cell, and as signalling hubs to integrate tissue-level mechanical stresses arising during growth. We provide genetic and molecular evidence for these hypotheses, and use this information to construct a mechanistic, multi-scale model of plant morphogenesis.
Host: Guido Grosmmann
Guests are welcome!
Thursday, October 27th, 2022
Meeting-Kennnummer (Zugriffscode): 2732 251 8273
Meeting Passwort: 2JAzAz5P4WE