Origin and evolution of genes related to ABA metabolism and its signaling pathways
Origin and evolution of genes related to ABA metabolism and its signaling pathways
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DOI：
10.1007/s10265-011-0431-0
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发表时间：
2011-07-01
影响因子：
2.8
通讯作者：
Okamoto, Masanori
中科院分区：
文献类型：
--
作者：
Hanada, Kousuke;Hase, Takeshi;Okamoto, Masanori
由于植物不能通过移动来避免胁迫，因此它们具有复杂的适应机制来对抗各种非生物胁迫。植物激素脱落酸（阿坝）在陆生植物的非生物胁迫耐受性中起着重要作用。因此，研究陆生植物阿坝代谢及其信号通路的进化起源是一个有趣的课题。本研究以拟南芥中48个ABA相关基因和11个蛋白质功能基因为研究对象，构建了11个ABA相关基因的正向同源簇。thaliana，拟南芥，大果杨，水稻，卷柏和小立碗藓。系统发育分析表明，这6个物种的共同祖先具有ABA相关基因的大部分关键蛋白功能。在两个物种（A. thaliana和O. sativa）中，阿坝信号通路相关基因的重复导致了不同器官或胁迫反应中的表达差异。特别是，有显着的扩展与阿坝相关的基因家族在进化时期与形态分化。总之，这些结果表明，阿坝信号通路相关基因家族的扩展可能有助于高等陆地植物复杂的胁迫耐受机制。
Since plants cannot move to avoid stress, they have sophisticated acclimation mechanisms against a variety of abiotic stresses. The phytohormone abscisic acid (ABA) plays essential roles in abiotic stress tolerances in land plants. Therefore, it is interesting to address the evolutionary origins of ABA metabolism and its signaling pathways in land plants. Here, we focused on 48 ABA-related Arabidopsis thaliana genes with 11 protein functions, and generated 11 orthologous clusters of ABA-related genes from A. thaliana, Arabidopsis lyrata, Populus trichocarpa, Oryza sativa, Selaginella moellendorffii, and Physcomitrella patens. Phylogenetic analyses suggested that the common ancestor of these six species possessed most of the key protein functions of ABA-related genes. In two species (A. thaliana and O. sativa), duplicate genes related to ABA signaling pathways contribute to the expression variation in different organs or stress responses. In particular, there is significant expansion of gene families related to ABA in evolutionary periods associated with morphological divergence. Taken together, these results suggest that expansion of the gene families related to ABA signaling pathways may have contributed to the sophisticated stress tolerance mechanisms of higher land plants.