Phyllotaxis from a Single Apical Cell

叶序 分生组织 生物 顶端细胞 植物 开枪 细胞 遗传学
作者
Elsa Véron,Teva Vernoux,Yoan Coudert
出处
期刊:Trends in Plant Science [Elsevier BV]
卷期号:26 (2): 124-131 被引量:34
标识
DOI:10.1016/j.tplants.2020.09.014
摘要

Convergent phyllotactic patterns shape architectural diversity in land plants. Phyllotaxis is determined by rotating divisions of a single apical cell in mosses. 4D patterns of apical cell division plane orientation rely on geometrical, physical, and biochemical cues. Shared molecular players act at different scales to drive leafy shoot morphogenesis and pattern phyllotaxis in distantly related plant lineages. Phyllotaxis, the geometry of leaf arrangement around stems, determines plant architecture. Molecular interactions coordinating the formation of phyllotactic patterns have mainly been studied in multicellular shoot apical meristems of flowering plants. Phyllotaxis evolved independently in the major land plant lineages. In mosses, it arises from a single apical cell, raising the question of how asymmetric divisions of a single-celled meristem create phyllotactic patterns and whether associated genetic processes are shared across lineages. We present an overview of the mechanisms governing shoot apical cell specification and activity in the model moss, Physcomitrium patens, and argue that similar molecular regulatory modules have been deployed repeatedly across evolution to operate at different scales and drive apical function in convergent shoot forms. Phyllotaxis, the geometry of leaf arrangement around stems, determines plant architecture. Molecular interactions coordinating the formation of phyllotactic patterns have mainly been studied in multicellular shoot apical meristems of flowering plants. Phyllotaxis evolved independently in the major land plant lineages. In mosses, it arises from a single apical cell, raising the question of how asymmetric divisions of a single-celled meristem create phyllotactic patterns and whether associated genetic processes are shared across lineages. We present an overview of the mechanisms governing shoot apical cell specification and activity in the model moss, Physcomitrium patens, and argue that similar molecular regulatory modules have been deployed repeatedly across evolution to operate at different scales and drive apical function in convergent shoot forms.
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