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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
The results of chlorophyll content and activities of PPO and POD in different materials of scab cultivars showed that there was no significant relationship between chlorophyll content and disease resistance. The activity of PPO and POD did not change much. Between 24 and 48 hours after inoculation, the increase of two enzymes activity of disease-resistant materials was significantly higher than that of susceptible materials. The susceptible materials increased greatly after 48 hours of inoculation, It showed that the changes of PPO and POD activity after inoculation were closely related to the cucumber resistance to scab