On the Evolutionary Origins of Land Plant Auxin Biology
On the Evolutionary Origins of Land Plant Auxin Biology
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DOI：
10.1101/cshperspect.a040048
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发表时间：
2021-06-01
影响因子：
7.2
通讯作者：
Kato, Hirotaka
中科院分区：
文献类型：
--
作者：
Bowman, John L.;Sandoval, Eduardo Flores;Kato, Hirotaka
吲哚-3-乙酸，也就是生长素，是一种广泛存在于从细菌到真核生物的生物系统发育分布中的分子。在祖先的土地上，植物生长素被认为是最重要的植物激素，介导着营养反应，并在整个生命周期中充当发育决定的促进器。陆地植物生长素生物基因的进化起源现在可以相当清晰地追踪到。编码陆地植物生长素生物合成途径的两种酶的基因是通过细菌的水平基因转移和基因复制后可能的新功能结合在一起出现在原始陆地植物中的。生长素转录信号网络的组成部分起源于祖先藻类基因，基因复制和关键结构域的新功能允许原有转录网络的一部分与生长素整合。关于直源基因在现存轮藻中的作用尚不清楚，但可以阐明生长素和增选转录网络的祖先功能。
Indole-3-acetic acid, that is, auxin, is a molecule found in a broad phylogenetic distribution of organisms, from bacteria to eukaryotes. In the ancestral land plant auxin was co-opted to be the paramount phytohormone mediating tropic responses and acting as a facilitator of developmental decisions throughout the life cycle. The evolutionary origins of land plant auxin biology genes can now be traced with reasonable clarity. Genes encoding the two enzymes of the land plant auxin biosynthetic pathway arose in the ancestral land plant by a combination of horizontal gene transfer from bacteria and possible neofunctionalization following gene duplication. Components of the auxin transcriptional signaling network have their origins in ancestral alga genes, with gene duplication and neofunctionalization of key domains allowing integration of a portion of the preexisting transcriptional network with auxin. Knowledge of the roles of orthologous genes in extant charophycean algae is lacking, but could illuminate the ancestral functions of both auxin and the co-opted transcriptional network.