摘要： 对黄瓜黑星病抗性不同材料的叶绿素含量和多酚氧化酶（PPO）、过氧化物酶（POD）活性的测定结果表明，叶绿素含量与抗病性无明显关系；接种后24h以内，各材料的PPO及POD活性变化不大，接种后24~48h之间，抗病材料两种酶活性的提高幅度明显高于感病材料，感病材料在接种48h后酶活性才有较大提高，说明接种后PPO、POD活性变化与黄瓜对黑星病的抗性之间有密切关系

关键词: 黄瓜, 黄瓜黑星病, 叶绿素, 多酚氧化酶, 过氧化物酶, 抗病性

Abstract: Cucumber varieties of different resisitance level to scab were inoculated with conidia of Cladosporium cucumerium,the content of chlorophyll,activity of polyphenol oxidase(PPO) and peroxidase(POD) were analysed before inoculation and 6h,12h,24h,36h,48h and 72h after inoculation.The results showed that there was no obvious relationship between the content of chlorophyll of the tested plants and their resistance.The activity of PPO and POD changed little within 24h after inoculation.The activity of PPO and POD of the resistant caltivars increased rapidly in 24-48h after inoculation as compared with the susceptible ones.The activity of PPO and POD of the susceptible varieties increased in 48h after inoculation.It was suggested that the changes in the activity of PPO and POD after inoculation were closely corelated with the varieties resistance.

Key words: Cucumber, Scab of cucumber, Chlorophyll, Polyphenol oxidase, Peroxidase, Disease resistance

中图分类号: 

• S436.421