Coronatine Modulated the Generation of Reactive Oxygen Species for Regulating the Water Loss Rate in the Detaching Maize Seedlings

Haiyue Yu, Yubin Wang, Jiapeng Xing, Yushi Zhang, Liusheng Duan, Mingcai Zhang and Zhaohu Li
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Haiyue Yu: College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
Yubin Wang: College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
Jiapeng Xing: College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
Yushi Zhang: College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
Liusheng Duan: College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
Mingcai Zhang: College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
Zhaohu Li: College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China

Agriculture, 2021, vol. 11, issue 7, 1-15

Abstract: Coronatine (COR), a structural and functional mimic of jasmonates, is involved in a wide array of effects on plant development and defense response. The present study aims to investigate the role of COR, in counteracting drought stress by modulating reactive oxygen species (ROS) homeostasis, water balance, and antioxidant regulation in detached maize plants. Our results showed that COR can markedly decrease the water loss rate, but the antioxidants diphenyleneiodonium chloride (DPI) and dimethylthiourea (DMTU) eliminate the effect of water loss induced by COR. Using the dye 2′,7′-dichlorofluorescein diacetate (H2DCF-DA) loaded in the maize epidermis guard cells, it is observed that COR could increase ROS production, and then antioxidants DPI and DMTU decreased ROS production induced by COR. In addition, the expression of ZmRBOHs genes, which were associated with ROS generation was increased by COR in levels and ZmRBOHC was highly expressed in the epidermis guard cells. Moreover, COR-treated plants increased H 2 O 2 and O 2 − · accumulation, antioxidant enzyme activities in control plants, while COR relieved the ROS accumulation and antioxidant enzyme activities under PEG treatment. These results indicated that COR could improve maize performance under drought stress by modulating ROS homeostasis to maintain water loss rate and antioxidant enzyme activities.

Keywords: coronatine; drought; antioxidant defense; reactive oxygen species (ROS); maize (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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