Developmental regulation of leaf venation patterns: monocot versus eudicots and the role of auxin.

Developmental regulation of leaf venation patterns: monocot versus eudicots and the role of auxin.
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叶静脉模式的发育调节:单子植物与Eudicots和生长素的作用。

DOI:
10.1111/nph.17955
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发表时间:
2022-05
期刊:
影响因子:
9.4
通讯作者:
Langdale, Jane A.
Langdale, Jane A.
中科院分区:
生物学1区
文献类型:
--
作者:
Perico, Chiara;Tan, Sovanna;Langdale, Jane A.

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陆地植物中维管网络的组织和模式在不同的分类、发育和环境背景下有所不同。在叶子中,维管束的连通程度会影响光和二氧化碳的收集能力以及水力能力。因此,调节叶脉图案的发育机制对生理性能有直接影响。叶脉网络的发育需要原基分生组织内原形成层细胞的特化,以及随后原形成层谱系的增殖和分化以形成维管束。因此,要了解不同的脉络模式是如何表现出来的,就需要从机制上了解原形成层在生长的叶子中是如何动态指定的。生长素在这一过程中的作用多年前就已被确定,但问题仍然存在。在这篇综述中,我们首先概述了陆地植物中存在的多种脉络模式,提供了进化的视角。然后,我们重点研究被子植物叶脉模式的发育调控,比较双子叶植物和单子叶植物的模式,以及生长素在每种情况下的作用。尽管出现了共同的主题,但我们得出的结论是,在双子叶植物中阐明的发育机制不太可能完全解释单子叶植物叶子中的平行脉络模式是如何阐述的。
Organisation and patterning of the vascular network in land plants varies in different taxonomic, developmental and environmental contexts. In leaves, the degree of vascular strand connectivity influences both light and CO2 harvesting capabilities as well as hydraulic capacity. As such, developmental mechanisms that regulate leaf venation patterning have a direct impact on physiological performance. Development of the leaf venation network requires the specification of procambial cells within the ground meristem of the primordium and subsequent proliferation and differentiation of the procambial lineage to form vascular strands. An understanding of how diverse venation patterns are manifest therefore requires mechanistic insight into how procambium is dynamically specified in a growing leaf. A role for auxin in this process was identified many years ago, but questions remain. In this review we first provide an overview of the diverse venation patterns that exist in land plants, providing an evolutionary perspective. We then focus on the developmental regulation of leaf venation patterns in angiosperms, comparing patterning in eudicots and monocots, and the role of auxin in each case. Although common themes emerge, we conclude that the developmental mechanisms elucidated in eudicots are unlikely to fully explain how parallel venation patterns in monocot leaves are elaborated.
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