新疆棉花品种次生代谢酶活性与诱导抗蚜性的关系

为了明确不同棉花品种次生代谢酶活性与诱导抗蚜性的关系,研究了不同类型棉花品种在棉蚜为害胁迫下,苯丙氨酸解氨酶(PAL)、过氧化物酶(POD)和多酚氧化酶(PPO)活性的变化及其对抗蚜性的影响。结果表明,未受蚜害时不同品种同一酶活性存在显著差异;受蚜害诱导后,抗蚜品种和感蚜品种3种酶活性均有不同程度的上升,抗蚜品种酶活性显著高于感蚜品种,诱导抗蚜性的强弱在不同品种间差异显著。

Correlation between induced resistance to aphids and secondary metabolism enzyme activities of cotton varieties in Xinjiang

In order to define the correlation between induced resistance to aphids and secondary metabolism enzyme activities of different cotton varieties, experiments were carried out to study the change in the activities of phenylalanine ammonia lyase (PAL), peroxidase (POD) and polyphenol oxidase (PPO) and their resistance to aphids on different cotton varieties. The results indicated that there were significant differences in the activity of the same enzyme in different varieties without aphid infestation. Under aphid infestation, the activities of three enzymes in resistant and susceptible varieties were increased distinctly, and the activity in resistant varieties was significantly higher than that in the susceptible ones. The contents of phenolic compounds were changed in the same way. The further tests showed that PAL, POD and PPO were participated in the defense system of cotton, and the strength of the induced resistance to aphids had significant differences between different varieties