Toward a 3D model of phyllotaxis

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Hartmann, Félix | Barbier de Reuille, Pierre | Kuhlemeier, Cris

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International audience. Auxin-driven patterning operates in two main modes: convergence and canalization. The shoot apicalmeristem is a potentially unique system in which these two modes co-occur in a coordinated mannerand in a fully three-dimensional geometry. In the epidermal layer, convergence points form, fromwhich auxin is canalized towards inner tissue. Each of these two patterning processes has beenextensively investigated separately, but the integration of both in the shoot apical meristem remainspoorly understood. We present a first attempt of a three-dimensional model of auxin-drivenpatterning during phyllotaxis. Our simulations are based on a biochemically plausible mechanism ofauxin transport proposed by Cieslak et al. (2015) which generates both convergence and canalizationpatterns. We are able to reproduce most of the dynamics of PIN1 polarization in the meristem, andwe explore how the epidermal and inner cell layers act in concert during phyllotaxis. In addition, wediscuss 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 ona biochemically plausible auxin-transport mechanism. PLoS Comput Biol 15(4): e1006896. https://doi.org/10.1371/journal.pcbi.1006896

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