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首页> 外文期刊>Journal of Experimental Botany >The Arabidopsis small GTPase AtRAC7/ROP9 is a modulator of auxin and abscisic acid signalling
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The Arabidopsis small GTPase AtRAC7/ROP9 is a modulator of auxin and abscisic acid signalling

机译：拟南芥小GTPase AtRAC7 / ROP9是生长素和脱落酸信号的调节剂

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摘要

Rac-like GTPases or Rho-related GTPases from plants (RAC/ROPs) are important components of hormone signalling pathways in plants. Based on phylogeny, several groups can be distinguished, and the underlying premise is that members of different groups perform distinct functions in the plant. AtRAC7/ROP9 is phylogenetically unique among 11 Arabidopsis RAC/ROPs, and here it was shown that it functions as a modulator of auxin and abscisic acid (ABA) signalling, a dual role not previously assigned to these small GTPases. Plants with reduced levels of AtRAC7/ROP9 had increased sensitivity to auxin and were less sensitive to ABA. On the other hand, overexpressing AtRAC7/ROP9 activated ABA-induced gene expression but repressed auxin-induced gene expression. In addition, both hormones regulated the activity of the AtRAC7/ROP9 promoter, suggesting a feedback mechanism to modulate the signalling output from the AtRAC7/ROP9-controlled molecular switch. High levels of AtRAC7/ROP9 were detected specifically in embryos and lateral roots, underscoring the important role of this protein during embryo development and lateral root formation. These results place AtRAC7/ROP9 as an important signal transducer in recently described pathways that integrate auxin and ABA signalling in the plant.
机译：植物中的Rac样GTPases或Rho相关的GTPases（RAC / ROPs）是植物激素信号通路的重要组成部分。基于系统发育，可以区分几个组，其基本前提是不同组的成员在植物中执行不同的功能。在11种拟南芥RAC / ROP中，AtRAC7 / ROP9在系统发育上是独特的，并且在这里表明，它可以作为生长素和脱落酸（ABA）信号的调节剂，这是以前没有赋予这些小GTP酶的双重作用。 AtRAC7 / ROP9水平降低的植物对植物生长素的敏感性增加，而对ABA的敏感性降低。另一方面，过表达AtRAC7 / ROP9会激活ABA诱导的基因表达，但会抑制生长素诱导的基因表达。此外，两种激素均调节AtRAC7 / ROP9启动子的活性，提示了一种反馈机制，可调节AtRAC7 / ROP9控制的分子开关的信号输出。高水平的AtRAC7 / ROP9专门在胚胎和侧根中检测到，强调了该蛋白在胚胎发育和侧根形成过程中的重要作用。这些结果使AtRAC7 / ROP9成为最近描述的整合植物生长素和ABA信号传导的途径中的重要信号转导者。

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