Three resistant lines and three susceptable lines were used in this experiment. The results showed that;1.SOD activity of all lines increased when infected by Cercospoora Sojina Hara , and the SOD activity of susceptable lines was higher than that of resistant lines. 2. the POD activity increased for all lines when infected, but the pod activity of susceptable lines was higher than that of resistant lines. 3. The ascorbic acid contents of susceptable lines was higher than that of resistant lines either or n...