Role of salicylic acid in alleviating oxidative damage in rice roots (Oryza sativa) subjected to cadmium stress
文献类型: 外文期刊
第一作者: Guo, B.
作者: Guo, B.;Liang, Y. C.;Zhu, Y. G.;Zhao, F. J.
作者机构:
关键词: antioxidant system;cadmium;hydrogen peroxide;rice;salicylic acid
期刊名称:ENVIRONMENTAL POLLUTION ( 影响因子:8.071; 五年影响因子:8.35 )
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年卷期:
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收录情况: SCI
摘要: Time-dependent changes in enzymatic and non-enzymatic antioxidants, and lipid peroxidation were investigated in roots of rice (Oryza sativa) grown hydroponically with Cd, with or without pretreatment of salicylic acid (SA). Exposure to 50 μM Cd significantly decreased root growth, and activities of superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD), but increased the concentrations of H_2O_2, malondialdehyde (MDA), ascorbic acid (AsA), glutathione (GSH) and non-protein thiols (NPT). However, pretreatment with 10 μM SA enhanced the activities of antioxidant enzymes and the concentrations of non-enzymatic antioxidants, but lowered the concentrations of H_2O_2 and MDA in the Cd-stressed rice compared with the Cd treatment alone. Pretreatment with SA alleviated the Cd-induced inhibition of root growth. The results showed that pretreatment with SA enhanced the antioxidant defense activities in Cd-stressed rice, thus alleviating Cd-induced oxidative damage and enhancing Cd tolerance. The possible mechanism of SA-induced H_2O_2 signaling in mediating Cd tolerance was discussed.
分类号: X5
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