Differential response to paraquat induced oxidative stress in two rice cultivars on antioxidants and chlorophyll a fluorescence |
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Authors: | Zhenfei Guo Meiyan Huang Shaoyun Lu Zhao Yaqing Qiao Zhong |
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Affiliation: | (1) College of Life Science, South China Agricultural University, Guangzhou, 510642, China;(2) Pharmacy College, Jinan University, Guangzhou, 510632, China |
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Abstract: | The responses of antioxidative system and photosystem II photochemistry of rice (Oryza sativa L.) to paraquat induced oxidative stress were investigated in a chilling-tolerant cultivar Xiangnuo no. 1, and a chilling-susceptible cultivar, IR-50. Electrolyte leakage and malondialdehyde (MDA) content of Xiangnuo no. 1 were little affected by paraquat, but they increased in IR-50. After paraquat treatment, superoxide dismutase (SOD) activity remained high in Xiangnuo no. 1, while it declined in IR-50. Activities of catalase (CAT), ascorbate peroxidase (APX) and glutathione reductase (GR) declined with oxidative stress in both cultivars, but Xiangnuo no. 1 had higher GR activity than IR-50. Under paraquat induced oxidative stress, ascorbic acid (AsA) and reduced glutathione (GSH) concentrations remained high in Xiangnuo no. 1, but decreased in IR-50. The results indicated that higher activities of SOD and GR and higher contents of AsA and GSH in Xiangnuo no. 1 under paraquat induced oxidative stress were associated with its tolerance to paraquat, while paraquat induced damage to IR-50 was related to decreased activities of SOD, APX and GR and contents of AsA and GSH. F v/F m, Φ PSII, and qP remained high in Xiangnuo no. 1, while they decreased greatly in IR-50 under paraquat induced oxidative stress. |
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Keywords: | Antioxidants Chlorophyll a fluorescence Oxidative stress Paraquat rice |
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