南瓜是葫芦科南瓜属蔬菜作物。白粉病作为南瓜三大病害之一主要发生在籽用南瓜生产的中后期,虽然不像疫病和病毒病为害严重,一般不会造成大面积绝产,但其发病率高,发病面积大,严重影响了籽用南瓜的籽粒饱满,降低了南瓜的商品性,给南瓜种植户造成了巨大的经济损失。本试验通过对感染白粉病后的南瓜体内PPO酶活性的测定分析,探讨抗感品种对几种酶活性的影响,从中 Pumpkin is a cucurbitaceae vegetable crops. As one of the three major diseases of pumpkin, powdery mildew occurs mainly in the middle and late stages of the production of pumpkin seeds. Although it is not seriously devastated by epidemics and virus diseases, it will not cause large-scale absolute production. However, its incidence is high, the area of ​​its disease is large and serious Affecting the pumpkin seed full of seeds, reducing the commercial nature of pumpkin, pumpkin growers caused tremendous economic losses. In this experiment, we analyzed the PPO activity in pumpkin plants infected with powdery mildew and explored the effects of resistant varieties on the activities of several enzymes.