The Mg-chelatase H subunit is an abscisic acid receptor

Yuan-Yue Shen, Xiao-Fang Wang, Fu-Qing Wu, Shu-Yuan Du, Zheng Cao, Yi Shang, Xiu-Ling Wang, Chang-Cao Peng, Xiang-Chun Yu, Sai-Yong Zhu, Ren-Chun Fan, Yan-Hong Xu and Da-Peng Zhang ()
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Yuan-Yue Shen: China Agricultural University
Xiao-Fang Wang: China Agricultural University
Fu-Qing Wu: China Agricultural University
Shu-Yuan Du: China Agricultural University
Zheng Cao: China Agricultural University
Yi Shang: China Agricultural University
Xiu-Ling Wang: China Agricultural University
Chang-Cao Peng: China Agricultural University
Xiang-Chun Yu: China Agricultural University
Sai-Yong Zhu: China Agricultural University
Ren-Chun Fan: China Agricultural University
Yan-Hong Xu: China Agricultural University
Da-Peng Zhang: China Agricultural University

Nature, 2006, vol. 443, issue 7113, 823-826

Abstract: Abstract 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.

Date: 2006
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DOI: 10.1038/nature05176

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