title: The flux-based PIN allocation mechanism can generate either canalyzed or diffuse distribution patterns depending on geometry and boundary conditions.
abstract: Growth and morphogenesis in plants require controlled transport of the plant hormone auxin. An important participant is the auxin effluxing protein PIN, whose polarized subcellular localization allows it to effectively transport auxin large distances through tissues. The flux-based model, in which auxin flux through a wall stimulates PIN allocation to that wall, is a dominant contender among models determining where and in what quantity PIN is allocated to cell walls. In this paper we characterise the behaviour of flux-based PIN allocation models in various tissues of the shoot apical meristem. Arguing from both mathematical analysis and computer simulations, we describe the natural behaviours of this class of models under various circumstances. In particular, we demonstrate the important dichotomy between sink- and source- driven systems, and show that both diffuse and canalized PIN distributions can be generated simultaneously in the same tissue, without model hybridization or variation of PIN-related parameters. This work is performed in the context of the shoot apical and floral meristems and is applicable to the construction of a unified PIN allocation model.
authors: INRIA, Virtual Plants Project Team, UMR AGAP, Montpellier, France. Michael.Walker@inria.fr
authors: Michael Luke
authors: ML
authors: Walker
authors: Etienne
authors: E
authors: Farcot
authors: Jan
authors: J
authors: Traas
authors: Christophe
authors: C
authors: Godin
mesh_terms: D000465:Algorithms; D001692:Biological Transport; D003198:Computer Simulation; D004058:Diffusion; D007210:Indoleacetic Acids / Q000378:metabolism; D018519:Meristem / Q000254:growth & development* / Q000378:metabolism*; D008954:Models, Biological; D063245:Plant Development; D010937:Plant Growth Regulators / Q000378:metabolism; D010940:Plant Proteins / Q000378:metabolism*
chemical_list: D007210:Indoleacetic Acids; D010937:Plant Growth Regulators; D010940:Plant Proteins
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