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Mechanical Stress Acts via Katanin to Amplify Differences in Growth Rate between Adjacent Cells in Arabidopsis

Abstract : The presence of diffuse morphogen gradients in tissues supports a view in which growth is locally homogenous. Here we challenge this view: we used a high-resolution quantitative approach to reveal significant growth variability among neighboring cells in the shoot apical meristem, the plant stem cell niche. This variability was strongly decreased in a mutant impaired in the microtubule-severing protein katanin. Major shape defects in the mutant could be related to a local decrease in growth heterogeneity. We show that katanin is required for the cell's competence to respond to the mechanical forces generated by growth. This provides the basis for a model in which microtubule dynamics allow the cell to respond efficiently to mechanical forces. This in turn can amplify local growth-rate gradients, yielding more heterogeneous growth and supporting morphogenesis.
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https://hal.archives-ouvertes.fr/hal-01004210
Contributor : Archive Ouverte Prodinra <>
Submitted on : Wednesday, June 11, 2014 - 11:08:25 AM
Last modification on : Tuesday, June 15, 2021 - 2:56:03 PM

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Magalie Uyttewaal, Agata Burian, Karen Alim, Benoi T. Landrein, Dorota Borowska-Wykret, et al.. Mechanical Stress Acts via Katanin to Amplify Differences in Growth Rate between Adjacent Cells in Arabidopsis. Cell, Elsevier, 2012, 149 (2), pp.439 - 451. ⟨10.1016/j.cell.2012.02.048⟩. ⟨hal-01004210⟩

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