2006•WIT transactions on ecology and the environmentRequires access
Effects of exogenous salicylic acid on peroxidation of leaf membrane-lipid in cucumber seedlings under lead stress
Huiqun Wang
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Abstract
Using cucumber seedlings as the material,effects of salicylic acid on peroxidation of leaf membrane-lipid under lead stress were studied.The results showed as follow: Content of malonadehyde in leaves under lead stress was decreased and content of soluble proteins was increased,activities of superoxide dismutase and peroxidase decreased by salicylic acid treatment;Within the SA concentration range of 0~1 mmol.L-1,the decrease of malonadehyde and the increase of superoxide dismutase activity in seed-ling leaves were positively correlated with exogenous salicylic acid concentration,but the increase of peroxidase activity were nega-tively correlated with exogenous salicylic acid concentrations under lead stress.Tolerance to lead was increased through improving resistance to the peroxidation of membrane-lipid of seedling leaves by exogenous salicylic acid.