Effects of NaCl stress on activities of protective enzyme and physiological characteristics in sweet sorghum seedlings

A study was made to investigate the effects of different concentrations of NaCl(100 mmol/L and 200 mmol/L) on content of chlorophyll and other physiological characteristics in sweet sorghum seedlings.The results showed that under different concentrations of NaCl,the content of proline(Pro) and malondialdehyde(MDA) increased continuously,and the same as plasma membrane permeability of sweet sorghum seedlings.However,the content of chlorophyll and soluble protein deceased gradually under NaCl treatment.The activities of superoxide dismutase(SOD) and catalase(CAT) in sweet sorghum leaves increased,of which both reached the maximum under 100 mmol/L NaCl treatment.The activities of peroxidase(POD) was in a trend of increase first and then decrease.So the physiological characteristics of sweet sorghum seedlings were obviously affected by the two treatments of different NaCl concentration..