J Integr Plant Biol. ›› 2015, Vol. 57 ›› Issue (2): 213-228.DOI: 10.1111/jipb.12222

Special Issue: Rice Genomics and Agriculture

• Plant-environmental Interactions • Previous Articles    

OsHK3 is a crucial regulator of abscisic acid signaling involved in antioxidant defense in rice

Feng Wen1†, Tingting Qin1†, Yao Wang1, Wen Dong1, Aying Zhang1, Mingpu Tan1 and Mingyi Jiang1,2*   

  1. 1College of Life Sciences, Nanjing Agricultural University, Nanjing, China
    2National Key Laboratory of Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing, China
  • Received:2014-04-12 Accepted:2014-06-07 Published:2014-06-09
  • About author:These authors contributed equally to this work.
    *Correspondence: E-mail: myjiang@njau.edu.cn

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, 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 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 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.

 

Wen F, Qin T, Wang Y, Dong W, Zhang A, Tan M, Jiang M (2015) OsHK3 is a crucial regulator of abscisic acid signaling involved in antioxidant defense in rice. J Integr Plant Biol 57: 213–228. doi: 10.1111/jipb.12222

Key words: Abscisic acid, antioxidant defense, histidine kinase, signal transduction, rice

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