Extracellular ATP mediates H2S-regulated stomatal movements and guard cell K+ current in a H2O2-dependent manner in Arabidopsis
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- 作者：Lanxiang Wang (1)
Xiaoyan Ma (2)
Yongmei Che (1)
Lixia Hou (1)
Xin Liu (1)
Wei Zhang (2)
1. Shandong Key Laboratory of Plant Biotechnology in University ; College of Life Sciences ; Qingdao Agricultural University ; Qingdao ; 266109 ; China
2. Key Laboratory of Plant Cell Engineering and Germplasm Innovation ; Ministry of Education ; College of Life Sciences ; Shandong University ; Jinan ; 250100 ; China - 关键词：Hydrogen sulfide (H2S) ; K+ current ; Extracellular ATP (eATP) ; Hydrogen peroxide (H2O2) ; Stomatal closure ; Arabidopsis thaliana
- 刊名：Chinese Science Bulletin
- 出版年：2015
- 出版时间：February 2015
- 年：2015
- 卷：60
- 期：4
- 页码：419-427
- 全文大小：1,061 KB
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- 出版者：Springer Berlin Heidelberg
- ISSN：1861-9541
文摘
Hydrogen sulfide (H2S) is a newly discovered gaseous signaling molecule and involved in ethylene and ABA-induced stomatal closure. As an important factor, extracellular ATP (eATP) was believed to participate in regulation of stomatal closing. However, the mechanism by which eATP mediates H2S-regulated stomatal closure remains unclear. Here, we employed Arabidopsis wild-type and mutant lines of ATP-binding cassette transporters (Atmrp4, Atmrp5 and their double mutant Atmrp4/5) to study the function of eATP in H2S-regulated stomatal movement. Our results indicated that H2S affected stomatal closing through stimulating guard cell outward K+ current. Moreover, we found that H2S induced eATP generation by regulating the activity of an ABC transporter. The inhibitor of ABC transporters, glibenclamide (Gli), could impair H2S-regulated stomatal closure and reduce H2S-dependent eATP accumulation in Atmrp4 and Atmrp5 mutants. In addition, the promotion effect of H2S on outward K+ currents was diminished in Atmrp4/5 double mutant. Our data suggested that hydrogen peroxide (H2O2) is required for H2S-induced stomatal closure, and the production of H2O2 is regulated by eATP via NADPH oxidase. Based on this work, we conclude that H2S-induced stomatal closure requires ABC transporter-dependent eATP production and subsequent NADPH oxidase-dependent H2O2 accumulation.