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- Title
The Mg-chelatase H subunit is an abscisic acid receptor.
- Authors
Shen, Yuan-Yue; Wang, Xiao-Fang; Wu, Fu-Qing; Du, Shu-Yuan; Cao, Zheng; Shang, Yi; Wang, Xiu-Ling; Peng, Chang-Cao; Yu, Xiang-Chun; Zhu, Sai-Yong; Fan, Ren-Chun; Xu, Yan-Hong; Zhang, Da-Peng
- 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.
- Subjects
ABSCISIC acid; PLANT hormones; SEED development; CHLOROPHYLL synthesis; ARABIDOPSIS; STOMATA; PROTEIN binding; HORMONE receptors
- Publication
Nature, 2006, Vol 443, Issue 7113, p823
- ISSN
0028-0836
- Publication type
Article
- DOI
10.1038/nature05176