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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >An auxin-driven polarized transport model for phyllotaxis
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An auxin-driven polarized transport model for phyllotaxis

机译：生长素驱动的极化轴运输模型

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Recent studies show that plant organ positioning may be mediated by localized concentrations of the plant hormone auxin. Auxin patterning in the shoot apical meristem is in turn brought about by the subcellular polar distribution of the putative auxin efflux mediator, PIN1. However, the question of what signals determine PIN1 polarization and how this gives rise to regular patterns of auxin concentration remains unknown. Here we address these questions by using mathematical modeling combined with confo-cal imaging. We propose a model that is based on the assumption that auxin influences the polarization of its own efflux within the meristem epidermis. We show that such a model is sufficient to create regular spatial patterns of auxin concentration on systems with static and dynamic cellular connectivities, the latter governed by a mechanical model. We also optimize parameter values for the PIN1 dynamics by using a detailed auxin transport model, for which parameter values are taken from experimental estimates, together with a template consisting of cell and wall compartments as well as PIN1 concentrations quantitatively extracted from confocal data. The model shows how polarized transport can drive the formation of regular patterns.
机译：最近的研究表明，植物器官的定位可能是由植物激素生长素的局部浓度介导的。顶生分生组织中的生长素模式又由推定的生长素外排介体PIN1的亚细胞极性分布引起。但是，什么信号决定PIN1极化以及如何引起生长素浓度的规律性的问题仍然未知。在这里，我们通过使用数学模型与共焦成像相结合来解决这些问题。我们提出了一个基于生长素影响分生组织表皮内自身外流极化的假设的模型。我们表明，这种模型足以在具有静态和动态细胞连接性的系统上创建生长素浓度的规则空间模式，后者由机械模型控制。我们还通过使用详细的生长素运输模型来优化PIN1动力学参数值，该模型的参数值来自实验估算值，以及包含细胞和壁隔室以及从共聚焦数据中定量提取的PIN1浓度的模板。该模型显示了极化传输如何驱动规则图案的形成。

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