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以中抗品种中油８２１和感病品系Ｓ—８９为对照，研究了甘蓝型油菜远缘杂交新品系９６２９和ＹＤ１６接种菌核病菌前后叶片中多酚氧化酶（ＰＰＯ）和过氧化物酶（ＰＯ）的活性变化。结果表明：４个材料接种菌核菌后的酶活性均较对照组高。ＰＰＯ的活性，抗病品系９６２９＞中抗品种（系）８２１和ＹＤ１６＞感病品系Ｓ—８９。抗病和中抗病品种（系）的ＰＯ活性高于感病品种。
The Zhongyou 821 and S-89 were used as control to study the changes of polyphenol oxidase (PPO) and peroxidase (PP) in leaves of 9629 and YD16 inoculated with Sclerotinia sclerotiorum ) Activity changes. The results showed that the activity of 4 materials after sclerotinia was higher than that of the control group. PPO activity, resistant line 9629> resistant line 821 and YD16> susceptible line S-89. The PO activity of resistant and resistant varieties was higher than that of susceptible varieties.