Phospholipase Dα1 and Phosphatidic Acid Regulate NADPH Oxidase Activity and Production of Reactive Oxygen Species in ABA-Mediated Stomatal Closure inArabidopsis

Plant Cell - Tập 21 Số 8 - Trang 2357-2377 - 2009
Yanyan Zhang1, Huiying Zhu1, Qun Zhang1, Maoyin Li2,3, Min Yan1, Rong Wang1, Liling Wang1, Ruth Welti4, Wenhua Zhang1, Xuemin Wang2,3
1College of Life Sciences, State Key Laboratory of Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing 210095, People’s Republic of China
2Department of Biology, University of Missouri, St. Louis, Missouri 63121
3Donald Danforth Plant Science Center, St. Louis, Missouri 63132
4Kansas Lipidomics Research Center, Division of Biology, Kansas State University, Manhattan, Kansas 66506

Tóm tắt

AbstractWe determined the role of Phospholipase Dα1 (PLDα1) and its lipid product phosphatidic acid (PA) in abscisic acid (ABA)-induced production of reactive oxygen species (ROS) in Arabidopsis thaliana guard cells. The pldα1 mutant failed to produce ROS in guard cells in response to ABA. ABA stimulated NADPH oxidase activity in wild-type guard cells but not in pldα1 cells, whereas PA stimulated NADPH oxidase activity in both genotypes. PA bound to recombinant Arabidopsis NADPH oxidase RbohD (respiratory burst oxidase homolog D) and RbohF. The PA binding motifs were identified, and mutation of the Arg residues 149, 150, 156, and 157 in RbohD resulted in the loss of PA binding and the loss of PA activation of RbohD. The rbohD mutant expressing non-PA-binding RbohD was compromised in ABA-mediated ROS production and stomatal closure. Furthermore, ABA-induced production of nitric oxide (NO) was impaired in pldα1 guard cells. Disruption of PA binding to ABI1 protein phosphatase 2C did not affect ABA-induced production of ROS or NO, but the PA–ABI1 interaction was required for stomatal closure induced by ABA, H2O2, or NO. Thus, PA is as a central lipid signaling molecule that links different components in the ABA signaling network in guard cells.

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Plant Cell

Tập 21 Số 8

2357-2377

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