Effects of Salt Stress and Drought Stress on the Membrane Stability of Cercis chinensis Seedlings

The aim was to study the injury mechanism of Cercischinensisseedlings under salt stress and drought stress,and it benefited for actual production of this plant.The changes in the activities of superoxide dismutase(SOD)and peroxidase(POD),the contents of malondiadehyde(MDA)and soluble protein in leaves of Cercis chinensis seedlings treated with 100mmol/L NaCl or 15mmol/L PEG,respectively,were studied.The results showed that SOD and POD activities increased firstly and then decreased in both the treatments.The effect of PEG was more significant than that of NaCl.The contents of MDA increased in both the treatments.There was a negative correlation between SOD/POD activities and MDA content.The content of protein decreased significantly in PEG treatment than in NaCl treatment.The decrease of SOD and POD activities resulted in the injury of Cercis chinensis seedlings under drought and salt stress,which strengthened the membrane lipid peroxidation and then increased MDA contents.