Resistance to Cadmium Stress of Rice Seedling Enhanced by Exogenous Salicylic Acid

doi:10.7668/hbnxb.2008.S1.034

Abstract

Abstract: To investigate whether tolerance to cadmium (Cd) stress of rice seedlings could be enhanced or not by exogenous salicylic acid (SA), rice seedlings were grown in half concentration of Kimura Solution B, CdCl2.500 mol/ L and 300mol/ L SA(SA1), or 500mol/ L SA(SA2) was added to the solution, and the free Salicylic acid as control (CK). Under Cd stress condition, the activities of superoxide dismutase (SOD), catalase (CAT), peroxidase (POD), chloro??phyll content and the photosynthesis rate of rice leaves were greatly decreased, andcontent of MDA in rice leaves weregreatly increased. But after SA was added to the nutrition solution with Cd, the act ivities of SOD, CAT and POD in riceleaves were greater than that with Cd stress, and the rate of reactive oxygen production, the content of H₂O₂ and MDA was decreased, the content of chlorophyll greatly decreased. All these results indicated that the tolerance to cadmium stress of rice seedlings could be increased by exogenous SA through its effects on the activities of antioxidant enzyme.

Key words: Rice seedling, Salicylic acid, Cadmium stress, React ive oxygen

CLC Number:

S511.01

WU Lun-zhong, HAN Rui-hong, MO Yi-wei, XIE Jiang-hui, WEI Xiang-hua. Resistance to Cadmium Stress of Rice Seedling Enhanced by Exogenous Salicylic Acid[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2008, 23(S1): 135-139. doi: 10.7668/hbnxb.2008.S1.034.

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http://www.hbnxb.net/EN/Y2008/V23/IS1/135

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