Berlin 2024 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 14: Poster IIa
BP 14.11: Poster
Dienstag, 19. März 2024, 18:00–20:30, Poster E
Mechanical stress patterns instruct the division plane orientation and tissue morphology during radial growth in Arabidopsis thaliana — •Mathias Höfler1, Xiaomin Liu2, Thomas Greb2, and Karen Alim1 — 1School of Natural Sciences, Technical University of Munich, Germany — 2Centre for Organismal Studies, Heidelberg University, Germany
Growing tissues requires coordination to morph functionally structured cell arrangements. Particularly, in plants, where cells cannot rearrrange spatially, coordination of cell division orientation is essential. Here, the radially growing tissue of the plant hypocotyl displays orchestrated cell divisions that pattern cell arrangements. In close comparison with experimental data we investigate how cell mechanics and emerging stress patterns may control cell division orientation and thereby emerging cell arrangement. Starting from reconstructed early hypocotyl cell pattern we model cell growth and follow the emerging mechanical stress pattern. Comparing mechanical stress guided cell division orientation with random cell division orientations we find that the well-ordered cell topologies of the hypocotyl only emerge when incorporating guidance by mechanical stress. Further, the instructive mechanical stress pattern is found to be robust against the cell division orientation. Finally, comparing changes to cell division patterns in experiment and model by mechanically pinching the hypocotyl confirm that mechanical stress instruct the cell division orientation, and thus organize radial growth and plant tissue arrangement.
Keywords: vertex model; mechanical stress; tissue growth; cell division; hypocotyl