Xumai 29 was sprayed with Salicylic acid(SA) of different concentrations(0.1,0.2,0.4,and 0.8 mmol/L) in this experiment.The results showed that: compared with the control,SA increased the Fresh-weight,Dry-weight,Chlorophyll content,root activity,SOD and POD activity of the treatments.The correlation analysis showed that the Fresh weight of treatments was significantly positive correlated with chlorophyll content,and highly significant with the Dry-weight;SOD activity was significantly positive correlated wi...