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Poster De Conférence Année : 2019

Toward a 3D model of phyllotaxis

Résumé

Auxin-driven patterning operates in two main modes: convergence and canalization. The shoot apical meristem is a potentially unique system in which these two modes co-occur in a coordinated manner and in a fully three-dimensional geometry. In the epidermal layer, convergence points form, from which auxin is canalized towards inner tissue. Each of these two patterning processes has been extensively investigated separately, but the integration of both in the shoot apical meristem remains poorly understood. We present a first attempt of a three-dimensional model of auxin-driven patterning during phyllotaxis. Our simulations are based on a biochemically plausible mechanism of auxin transport proposed by Cieslak et al. (2015) which generates both convergence and canalization patterns. We are able to reproduce most of the dynamics of PIN1 polarization in the meristem, and we explore how the epidermal and inner cell layers act in concert during phyllotaxis. In addition, we discuss the mechanism by which initiating veins connect to the already existing vascular system. References: - Cieslak M, Runions A, Prusinkiewicz P. Auxin-driven patterning with unidirectional fluxes. J Exp Bot. 2015;66(16):5083–5102. https://doi.org/10.1093/jxb/erv262 - Hartmann FP, Barbier de Reuille P, Kuhlemeier C (2019) Toward a 3D model of phyllotaxis based on a biochemically plausible auxin-transport mechanism. PLoS Comput Biol 15(4): e1006896. https://doi.org/10.1371/journal.pcbi.1006896

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Dates et versions

hal-02306159 , version 1 (05-06-2020)

Identifiants

  • HAL Id : hal-02306159 , version 1
  • PRODINRA : 485240

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Félix Hartmann, Pierre Barbier de Reuille, Cris Kuhlemeier. Toward a 3D model of phyllotaxis. International Symposium on quantitative plant morphodynamics, Sep 2019, Heidelberg, Germany. , 2019. ⟨hal-02306159⟩
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