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根据棉蚜与棉花的种间互作关系，本文从次生代谢角度，研究了不同类型品种棉苗在棉蚜为害胁迫下，苯丙氨酸解氨酶（ＰＡＬ）和多酚氧化酶（ＰＰＯ）活性、多酚含量的变化及其对抗蚜性表现和后期棉蚜种群数量消长所产生的影响。结果表明，受蚜害诱导后，ＰＡＬ和ＰＰＯ活性及多酚含量均有不同程度的上升。与感蚜品种相比，抗蚜品种上升快，峰值高，防御反应及时有效。这种诱导抗蚜性强弱在不同基因型间存在差异，与蚜害指数高低呈负相关关系。
According to the interspecific interaction between cotton aphid and cotton aphid, from the perspective of secondary metabolism, the effects of cotton aphid on cotton aphid were analyzed under the stress of cotton aphid. Phenylalanine ammonia lyase (PAL) and polyphenol oxidase (PPO) ) Activity, the changes of polyphenol content and their effects on the resistance to aphids and the population growth and decline of Aphis gossypii in the late stage. The results showed that the activity of PAL and PPO and the content of polyphenols all increased to some extent after being induced by aphids. Compared with the susceptible aphid varieties, the resistance to aphid varieties rose rapidly, the peak is high, and the defensive response is timely and effective. This induction of aphid resistance in different genotypes there is a difference, and the level of pest index was negatively correlated.