为研究不同抗性豌豆品种在接种白粉菌后相关防御系统酶活性、叶绿素质量浓度的变化，以8个不同抗性豌豆品种为试材，分析了豌豆白粉菌接种后不同时间相关SOD活性、POD活性、CAT活性、叶绿素质量浓度的变化规律。结果表明，接种后SOD活性随着时间变化均表现为先升高后降低，抗病品种的SOD的活性高于感病品种。接种后POD活性随着时间变化呈现持续上升趋势，抗病品种上升幅度高于感病品种。接种后CAT活性随着接种后时间的变化，多数品种呈现先升高后降低的变化。接种后所有品种的叶绿素质量浓度均下降，抗病品种的下降趋势小于感病品种。SOD活性、POD活性变化与品种间差异显著，POD活性、叶绿素质量浓度与豌豆品种的抗性呈正相关。

Taking eight pea cultivars with different resistance to powdery mildew as the research object，we studied the relevant defence system changes of enzyme activity(SOD， POD， CAT)， chlorophyll content change rule in different time after inoculation with Erysiphe pisi. The results showed that SOD activity were reduced after the first rise after infected as time change，SOD activity of resistant cultivars were higher than susceptible cultivars；as time change POD activity showed a trend of rising， POD activity of resistant cultivars were higher than susceptible cultivars after infected；as time change CAT activity of most cultivars were reduced after the first increase after infected；Chlorophyll contents of all cultivars decreased after infected， resistant cultivars declined less than susceptible cultivars. SOD，POD activity change between cultivars were significantly different. The ability of resistance to powdery mildew of a pea variety is positively correlated with the activity of POD and the content of Chlorophyll.

S435.24

国家自然科学基金(317604207)；甘肃省青年科技基金计划项目(145RJYA303)。