title: OsHK3 is a crucial regulator of abscisic acid signaling involved in antioxidant defense in rice.
abstract: 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, H2 O2 , and polyethylene glycol (PEG) induced the expression of OsHK3 in rice leaves, and H2 O2 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 upregulation 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 H2 O2 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 H2 O2 production in ABA signaling.
authors.affiliation: College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Wen
authors.forename: Tingting
authors.initials: T
authors.lastname: Qin
authors.forename: Yao
authors.initials: Y
authors.lastname: Wang
authors.forename: Wen
authors.initials: W
authors.lastname: Dong
authors.forename: Aying
authors.initials: A
authors.lastname: Zhang
authors.forename: Mingpu
authors.initials: M
authors.lastname: Tan
authors.forename: Mingyi
authors.initials: M
authors.lastname: Jiang
mesh_terms: D000040:Abscisic Acid / Q000378:metabolism* / Q000494:pharmacology; D000975:Antioxidants / Q000378:metabolism*; D060387:Ascorbate Peroxidases / Q000378:metabolism; D002374:Catalase / Q000378:metabolism; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D005980:Glutathione Reductase / Q000378:metabolism; D006861:Hydrogen Peroxide / Q000494:pharmacology; D008954:Models, Biological; D012275:Oryza / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism*; D018515:Plant Leaves / Q000187:drug effects / Q000235:genetics; D010940:Plant Proteins / Q000378:metabolism*; D011092:Polyethylene Glycols / Q000494:pharmacology; D021381:Protein Transport / Q000187:drug effects; D011523:Protoplasts / Q000187:drug effects / Q000378:metabolism; D034622:RNA Interference / Q000187:drug effects; D015398:Signal Transduction / Q000187:drug effects / Q000235:genetics; D013347:Subcellular Fractions / Q000187:drug effects / Q000378:metabolism; D013482:Superoxide Dismutase / Q000378:metabolism; D015854:Up-Regulation / Q000187:drug effects / Q000235:genetics
chemical_list: D000975:Antioxidants; D010940:Plant Proteins; D011092:Polyethylene Glycols; D000040:Abscisic Acid; D006861:Hydrogen Peroxide; D060387:Ascorbate Peroxidases; D002374:Catalase; D013482:Superoxide Dismutase; D005980:Glutathione Reductase
keywords: Abscisic acid; antioxidant defense; histidine kinase; rice; signal transduction