大白菜品种间根肿病抗性鉴定及抗性生理分析

Evaluation of Resistance and Analysis of Resistance Physiology in Varieties of Chinese Cabbage Infected by Plasmodiophora brassicae

通过苗期人工接种抗性鉴定、寄主防御酶活性和抗病相关物质含量变化测定,研究大白菜品种对根肿病的抗性及根肿病对大白菜生长的影响。结果表明:13个大白菜品种中‘87-114’较为抗病,"夏抗王"较为感病,没有免疫品种;大白菜植株接种根肿菌后,抗感品种的PAL、SOD、PPO、POD活性和Pro、MDA含量均呈不同程度的升高,且多数防御酶具有单峰型酶活高峰,活性提高幅度因酶而异。抗病品种寄主防御酶活性较感病品种增加幅度大,并且酶活峰值出现的时间也早于感病品种。

The experiment focused on the research of resistance and growth of different varieties of Chinese cabbages infected by Plasmodiophora brassicae,according to artificial vaccination of seeding stage and the variation of defensive enzymes and substances relevant to the host defense.The results showed that ’87-114’ was more resistant than others,’Xiakangwang’ was more susceptible to Plasmodiophora brassicae,and the kind of complete immunity was not found out from the test race.For resistant and susceptible varieties,the activities of PAL,SOD,PPO,POD and the contents of Pro,MDA were all increased in different degree after inoculating the Plasmodiophora brassicae.The most of defensive enzymes existed the unimodal peak of enzyme activity,and the amplitude of improvement in different enzyme was different as well.The activity of resistant variety can be increased to a higher extent than susceptible one,and the peak appeared earlier than that of susceptible.