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Tissue-wide integration of mechanical cues promotes efficient auxin patterning

João R. D. Ramos, View ORCID ProfileAlexis Maizel, View ORCID ProfileKaren Alim
doi: https://doi.org/10.1101/820837
João R. D. Ramos
aMax Planck Institute for Dynamics and Self-Organization, 37077 Göttingen, Germany
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Alexis Maizel
bCenter for Organismal Studies, University of Heidelberg, Heidelberg, Germany
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Karen Alim
cPhysik-Department, Technische Universität München, Garching, Germany
aMax Planck Institute for Dynamics and Self-Organization, 37077 Göttingen, Germany
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  • For correspondence: k.alim@tum.de
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Abstract

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.

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Posted October 28, 2019.
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Tissue-wide integration of mechanical cues promotes efficient auxin patterning
João R. D. Ramos, Alexis Maizel, Karen Alim
bioRxiv 820837; doi: https://doi.org/10.1101/820837
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Tissue-wide integration of mechanical cues promotes efficient auxin patterning
João R. D. Ramos, Alexis Maizel, Karen Alim
bioRxiv 820837; doi: https://doi.org/10.1101/820837

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