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Microtubule-Mediated Wall Anisotropy Contributes to Leaf Blade Flattening

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Schneider,  R.
Plant Cell Biology and Microscopy, Infrastructure Groups and Service Units, Max Planck Institute of Molecular Plant Physiology, Max Planck Society;

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Sampathkumar,  A.
Plant Cell Biology and Microscopy, Infrastructure Groups and Service Units, Max Planck Institute of Molecular Plant Physiology, Max Planck Society;

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Citation

Zhao, F., Du, F., Oliveri, H., Zhou, L., Ali, O., Chen, W., et al. (2020). Microtubule-Mediated Wall Anisotropy Contributes to Leaf Blade Flattening. Current Biology, 30(20), 3972-3985. doi:10.1016/j.cub.2020.07.076.


Cite as: http://hdl.handle.net/21.11116/0000-0007-003E-4
Abstract
Summary Plant organs can adopt a wide range of shapes, resulting from highly directional cell growth and divisions. We focus here on leaves and leaf-like organs in Arabidopsis and tomato, characterized by the formation of thin, flat laminae. Combining experimental approaches with 3D mechanical modeling, we provide evidence that leaf shape depends on cortical microtubule mediated cellulose deposition along the main predicted stress orientations, in particular, along the adaxial-abaxial axis in internal cell walls. This behavior can be explained by a mechanical feedback and has the potential to sustain and even amplify a preexisting degree of flatness, which in turn depends on genes involved in the control of organ polarity and leaf margin formation.