A plausible model of phyllotaxis
A plausible model of phyllotaxis
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DOI：
10.1073/pnas.0510457103
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发表时间：
2006-01-31
影响因子：
11.1
通讯作者：
Prusinkiewicz, P
中科院分区：
文献类型：
--
作者：
Smith, RS;Guyomarc'h, S;Prusinkiewicz, P
植物界一个独特的惊人现象是侧生器官围绕中轴的规则排列，称为叶序。最近的分子遗传学实验表明，植物激素生长素的主动运输是调节叶序的关键过程。基于这些实验的概念模型，由Reinhardt等人[Reinhardt，D.，佩斯E. R.，Stieger，P.，曼德尔，T.，Baltensperger，K.，等人（2003）Nature 426，255-260]，提供了对数据的直观合理的解释，但提出了所提出的机制实际上是否能够产生所观察到的时间和空间模式、是否稳健、是否可以从头开始、以及是否可以解释叶序转变，例如经常观察到的从交叉向螺旋叶序转变。为了回答这些问题，我们建立了一个计算机模拟模型的基础上所描述的数据或本文和合理的假设。该模型再现，在标准误差范围内，在拟南芥幼苗和选定的实验操作的影响测量的发散角。它也复制二对，交互对生，和三对生的模式。因此，该模型提供了一个合理的联系形态发生的分子机制和叶序的几何形状。
A striking phenomenon unique to the kingdom of plants is the regular arrangement of lateral organs around a central axis, known as phyllotaxis. Recent molecular-genetic experiments indicate that active transport of the plant hormone auxin is the key process regulating phyllotaxis. A conceptual model based on these experiments, introduced by Reinhardt et al, [Reinhardt, D., Pesce, E. R., Stieger, P., Mandel, T., Baltensperger, K., et al. (2003) Nature 426, 255-260], provides an intuitively plausible interpretation of the data, but raises questions of whether the proposed mechanism is, in fact, capable of producing the observed temporal and spatial patterns, is robust, can start de novo, and can account for phyllo-tactic transitions, such as the frequently observed transition from decussate to spiral phyllotaxis. To answer these questions, we created a computer simulation model based on data described previously or in this paper and reasonable hypotheses. The model reproduces, within the standard error, the divergence angles measured in Arabidopsis seedlings and the effects of selected experimental manipulations. It also reproduces distichous, decussate, and tricussate patterns. The model thus offers a plausible link between molecular mechanisms of morphogenesis and the geometry of phyllotaxis.