Dresden 2020 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 30: Cell Adhesion and Migration, Multicellular Systemadhesion and Migration, Multicellular Systems II
BP 30.3: Vortrag
Donnerstag, 19. März 2020, 10:15–10:30, HÜL 386
Tissue-wide integration of mechanical cues promotes efficient auxin patterning — •João R. D. Ramos1, Alexis Maizel2, and Karen Alim1,3 — 1Max Planck Institute for Dynamics and Self-Organization, 37077 Göttingen, Germany — 2Center for Organismal Studies, University of Heidelberg, Heidelberg, Germany — 3Physik-Department, Technische Universität München, Garching, Germany
New plants organs form by local accumulation of auxin, which is transported by PIN proteins that localize following mechanical stresses. As auxin itself modifies tissue mechanics, a feedback loop between tissue mechanics and auxin patterning unfolds, yet the impact of tissue-wide mechanical coupling on auxin pattern emergence remains unclear. Here, we use a hybrid model composed of a vertex model for plant tissue mechanics, and a compartment model for auxin transport to explore the collective mechanical response of the tissue to auxin patterns and how it feeds back onto auxin transport. We compare a model accounting for a tissue-wide mechanical integration to a model where mechanical stresses are averaged out across the tissue. We show that only tissue-wide mechanical coupling leads to focused auxin spots, which we show to result from the formation of a circumferential stress field around these spots, self-reinforcing PIN polarity and auxin accumulation.