leaf relative conductivity rate increase and malondialdehyde content ascend,cell plasmid membrane was destructed,SOD activity hardly change and POD activity ascend,show that POD activity play more important role inquenching activated oxygen than SOD does.

• 叶片相对电导率增加、丙二醛含量上升，细胞膜质受到损伤，SOD活性变化不明显，POD活性上升，清除活性氧保持细胞膜的完整性方面，POD酶所起的作用要大于SOD酶。