Effect of salt stress on antioxidative enzymes in sweet sorghum seedlings

This study investigated the effects of different concentrations of NaCl(0,50,100,and 150 mmol/L) on antioxidative enzymes activity including superoxide dismutase(SOD),peroxidase(POD) and catalase(CAT),and the content of malondialdehyde(MDA) in sweet sorghum seedlings.The results showed that the activities of SOD、POD and CAT were increased in plants exposed to 50 mmol/L NaCl compared to control,while the activities of these 3 enzymes were inhibited at 100 and 150 mmol/L NaCl.All tested concentrations of NaCl resulted in lipid peroxidation as indicated by MDA formation with a dose-effectiveness relationship.The NaCl sensibility was different among the four sweet sorghums,with the most tolerance occurring in No.1 of Liao Sweet,as shown by the highest antioxidative enzyme activity and the lowest MDA accumulation,which suggested that the No.1 of Liao Sweet may be a good candidate.