The Mg-chelatase H subunit is an abscisic acid receptor

被引：397

作者：

Shen, Yuan-Yue ^{[1
]}

Wang, Xiao-Fang ^{[1
]}

Wu, Fu-Qing ^{[1
]}

Du, Shu-Yuan ^{[1
]}

Cao, Zheng ^{[1
]}

Shang, Yi ^{[1
]}

Wang, Xiu-Ling ^{[1
]}

Peng, Chang-Cao ^{[1
]}

Yu, Xiang-Chun ^{[1
]}

Zhu, Sai-Yong ^{[1
]}

Fan, Ren-Chun ^{[1
]}

Xu, Yan-Hong ^{[1
]}

Zhang, Da-Peng ^{[1
]}

机构：

[1] China Agr Univ, China State Key Lab Plant Physiol & Biochem, Beijing 100094, Peoples R China

来源：

NATURE | 2006年 / 443卷 / 7113期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1038/nature05176

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Abscisic acid (ABA) is a vital phytohormone that regulates mainly stomatal aperture and seed development, but ABA receptors involved in these processes have yet to be determined. We previously identified from broad bean an ABA-binding protein (ABAR) potentially involved in stomatal signalling, the gene for which encodes the H subunit of Mg-chelatase (CHLH), which is a key component in both chlorophyll biosynthesis and plastid-to-nucleus signalling. Here we show that Arabidopsis ABAR/CHLH specifically binds ABA, and mediates ABA signalling as a positive regulator in seed germination, post-germination growth and stomatal movement, showing that ABAR/CHLH is an ABA receptor. We show also that ABAR/CHLH is a ubiquitous protein expressed in both green and non-green tissues, indicating that it might be able to perceive the ABA signal at the whole-plant level.

引用

页码：823 / 826

页数：4

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