ROP11 GTPase is a Negative Regulator of Multiple ABA Responses in Arabidopsis

查看全文 作　　者：Zixing Li Jun Kang Ning Sui Dong [1]Liu

机构地区：[1]MOE Key Laboratory of Bioinformatics, School of Life Sciences, Tsinghua University, Beijing 100084, China

出　　处：《Journal of Integrative Plant Biology》索引2012年第54卷第3期,共11页

基　　金：supported by the National Basic Research Program of China(973Program)(2009CB119100);the National Natural Science Foundation of China(90717121) 摘　　要：The phytohormone abscisic acid (ABA) plays crucial roles in plant development and plant responses to environmental stresses. Although ABA receptors and a minimal set of core molecular components have recently been discovered, understanding of the ABA signaling pathway is still far from complete. In this work, we characterized the function of ROP11, a member of the plant-specific ROP small GTPases family, in the ABA signaling process. ROP11 is preferentially expressed in guard cells in all plant organs with stomata. Expression of a constitutively active ROP11 (CA-ROP11) suppresses ABA-mediated responses, whereas reduced expression of ROP11 or expression of its dominant-negative form (DN-ROP11) causes the opposite phenotypes. The affected ABA-mediated responses by ROP11 include seed germination, seedling growth, stomatal closure, induction of ABA-responsive genes, as well as plant response to drought stress. Furthermore, we showed that ROP11 and its closest-related family member, ROP10, act in parallel in mediating these responses. ABA treatment does not affect ROP11 transcription and protein abundance; however, it causes the accumulation of CA-ROP11 in the nucleus. These results demonstrated that ROP11 is a negative regulator of multiple ABA responses in Arabidopsis. 关键词：ABA GTP酶拟南芥负调节信号转导通路植物响应植物生长发育气孔保卫细胞

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ROP11 GTPase is a Negative Regulator of Multiple ABA Responses in Arabidopsis

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