Effect of Salicylic Acid on Membrane Lipid Peroxidation in Rice Seedlings under Copper Stress

In order to investigate the effect of SA in relieving heavy metal stress,the effect of salicylic acid on membrane lipid peroxidation in rice seedlings leaf under copper stress were studied by water culture experiment with rice as material.The results showed that with the elevation of Cu 2+ concentration,the membrane integrity of rice seedlings leaf was destroyed and the electric conductivity increased,the maximum was 2.62 times of the control group,meanwhile the MDA content was raised significantly,which indicated that the membrane lipid peroxidation was intensified.But when salicylic acid was drop wised during the water culture,the electric conductivity and MDA content were both decreased,which illustrated the salicylic acid could protect the integrity of membrane system in certain degree and release the membrane lipid peroxidation of rice seedlings leaf.At the same time,salicylic acid also increased POD,CAT and SOD activity of rice seedling leaf,enriched protective enzyme in plant and reinforced the ability of rice seedling opposition to heavy metal poison.