摘要
In this study, the role of the rice （Oryza sativa L.） histidine kinase OsHK3 in abscisic acid （ABA）-induced antioxidant defense was investigated. Treatments with ABA, H2O2, and polyethylene glycol （PEG） induced the expression of OsHK3 in rice leaves, and H2O2 is required for ABA-induced increase in the expression of OsHK3 under water stress. Subcellular localization analysis showed that OsHK3 is located in the cytoplasm and the plasma membrane. The transient expression analysis and the transient RNA interference test in rice protoplasts showed that OsHK3 is required for ABA-induced upreguiation in the expression of antioxidant enzymes genes and the activities of antioxidant enzymes. Further analysis showed that OsHK3 functions upstream of the calcium/ calmodulin-dependent protein kinase OsDMI3 and the mitogen-activated protein kinase OsMPK1 to regulate the activities of antioxidant enzymes in ABA signaling. Moreover, OsHK3 was also shown to regulate the expression of nicotinamide adenine dinucleotide phosphate oxidase genes, OsrbohB and OsrbohE, and the production of H2O2 in ABA signaling. Our data indicate that OsHK3 play an important role in the regulation of ABA-induced antioxidant defense and in the feedback regulation of H2O2 production in ABA signaling.
In this study, the role of the rice （Oryza sativa L.） histidine kinase OsHK3 in abscisic acid （ABA）-induced antioxidant defense was investigated. Treatments with ABA, H2O2, and polyethylene glycol （PEG） induced the expression of OsHK3 in rice leaves, and H2O2 is required for ABA-induced increase in the expression of OsHK3 under water stress. Subcellular localization analysis showed that OsHK3 is located in the cytoplasm and the plasma membrane. The transient expression analysis and the transient RNA interference test in rice protoplasts showed that OsHK3 is required for ABA-induced upreguiation in the expression of antioxidant enzymes genes and the activities of antioxidant enzymes. Further analysis showed that OsHK3 functions upstream of the calcium/ calmodulin-dependent protein kinase OsDMI3 and the mitogen-activated protein kinase OsMPK1 to regulate the activities of antioxidant enzymes in ABA signaling. Moreover, OsHK3 was also shown to regulate the expression of nicotinamide adenine dinucleotide phosphate oxidase genes, OsrbohB and OsrbohE, and the production of H2O2 in ABA signaling. Our data indicate that OsHK3 play an important role in the regulation of ABA-induced antioxidant defense and in the feedback regulation of H2O2 production in ABA signaling.
基金
supported by the National Basic Research Program of China (2012CB114306)
the National Natural Science Foundation of China (31070254 and 31271631)
the Fundamental Research Funds for the Central Universities (KYZ201157 and KYTZ201402)
the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions
the Research Fund for the Doctoral Program of Higher Education of China (20130097110025)
