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Gravitropic Movement in Wheat Coleoptile is Regulated by Ultradian Growth Oscillations

Renaud Bastien, Olivia Guayasamin, Stéphane Douady, Bruno Moulia
doi: https://doi.org/10.1101/093146
Renaud Bastien
1Department of Collective Behaviour, Max Planck Institute for Ornithology and Department of Biology, University of Konstanz, Konstanz, Germany
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Olivia Guayasamin
1Department of Collective Behaviour, Max Planck Institute for Ornithology and Department of Biology, University of Konstanz, Konstanz, Germany
2Department of Ecology and Evolutionary Biology, Princeton University, Princeton, USA
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Stéphane Douady
3Matiére et Systémes Complexes, Université Paris-Diderot, Paris Cedex 13, France
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Bruno Moulia
4UCA, INRA, UMR PIAF, 63000 Clermont-Ferrand, France
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Abstract

To stand straight and upright along their growth, plants needs to regulate actively their posture. Gravitropic movement, which occurs when plants modify their growth and curvature to orient their aerial organ against the force of gravity, is a major feature of this postural control. A recent model has shown that graviception and proprioception are sufficient to account for the gravitropic movement and subsequent organ posture demonstrated by a range of species. However, some plants, including wheat coleoptiles, exhibit a stronger regulation of posture than predicted by the model. Here, we performed an extensive kinematics study on wheat coleoptiles during a gravitropic perturbation experiment in order to better understand this unexpectedly strong regulation. Close temporal observation of the data revealed that both perturbed and unperturbed coleoptiles showed oscillatory pulses of elongation and curvature variation that propagated from the apex to the base of their aerial organs. In perturbed (tilted) coleoptiles, we discovered a non-trivial coupling between the oscillatory dynamics of curvature and elongation. This relationship appears to be critical to the postural control of the organ, and indicates the presence of a mechanism that is capable of affecting the relationship between elongation rate, differential growth, and curvature.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted December 21, 2017.
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Gravitropic Movement in Wheat Coleoptile is Regulated by Ultradian Growth Oscillations
Renaud Bastien, Olivia Guayasamin, Stéphane Douady, Bruno Moulia
bioRxiv 093146; doi: https://doi.org/10.1101/093146
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Gravitropic Movement in Wheat Coleoptile is Regulated by Ultradian Growth Oscillations
Renaud Bastien, Olivia Guayasamin, Stéphane Douady, Bruno Moulia
bioRxiv 093146; doi: https://doi.org/10.1101/093146

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