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BRI1-Associated Receptor Kinase 1 Regulates Guard Cell aba Signaling Mediated by Open Stomata 1 in Arabidopsis

Molecular Plant 2016年第3期9卷 447-460页

作者： Yun Shang Changbo Dai Myeong Min Lee June M. Kwak Kyoung Hee Nam Department of Biological Sciences Sookmyung Women's University Seou1140-742 Republic of Korea Department of Systems Biology Yonsei University Seou1120-749 Republic of Korea Department of New Biology Center for Plant Aging Research Institute for Basic Science Daegu Gyeongbuk Institute of Science and Technology Daegu 711-873 Republic of Korea

stomatal movements are critical in regulating gas exchange for photosynthesis and water balance between plant tissues and the atmosphere. The plant hormone abscisic acid （aba） plays key roles in regulating stomatal closure under various abiotic stresses. In this study, we revealed a novel role of BAKI in guard cell aba signaling. We found that the brassinosteroid （BR） signaling mutant bakl lost more water than wild- type plants and showed aba insensitivity in stomatal closure. aba-induced OST1 expression and reactive oxygen species （ROS） production were also impaired in bakl. Unlike direct treatment with H202, overex-pression of OST1 did not completely rescue the insensitivity of bakl to aba. We demonstrated that BAK1 forms a complex with OST1 near the plasma membrane and that the BAKI/OST1 complex is increased in response to aba in planta. Brassinolide, the most active BR, exerted a negative effect on aba-induced formation of the BAK1/OST1 complex and OST1 expression. Moreover, we found that BAK1 and ABI1 oppositely regulate OST1 phosphorylation in vitro, and that ABI1 interacts with BAK1 and inhibits the interaction of BAK1 and OST1. Taken together, our results suggest that BAK1 regulates aba-induced stomatal closure in guard cells.

关键词： BAK1 OST1 aba-induced stomatal closure Arabidopsis thaliana

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