绿盲蝽取食与机械损伤对棉花叶片内防御性酶活性的影响

为探明绿盲蝽Apolygus lucorum (Mayer-Dür)取食和机械损伤对不同抗性棉花叶片内主要防御酶活性的影响以及防御酶与棉花抗绿盲蝽性的关系,以棉花3个不同抗性品系为材料,室内条件下测定绿盲蝽取食和机械损伤处理后棉叶中苯丙氨酸解氨酶(PAL)、过氧化物酶(POD)和多酚氧化酶(PPO)的活性.结果表明:对...

Effects of Apolygus lucorum feeding and mechanical damage on defense enzyme activities in cotton leaves

Active changes in the levels of the defensive enzymes phenylalanine aminolyase（PAL）,peroxidase（POD） and polyphenol oxidase（PPO）,were evaluated in the leaves of various cotton varieties that had either been fed on by Apolygus lucorum（Mayer-Dür）,or subject to mechanical damage,under laboratory conditions.The results indicate that PAL,POD and PPO activity were significantly higher in resistant than in susceptible varieties.PAL,POD and PPO activity increased in each variety following damage by A.lucorum but peaked in resistant varieties earlier than in susceptible varieties.However,changes in PAL,POD and PPO activity following mechanical damage were not as obvious as those observed following feeding by A.lucorum.These results suggest that PAL,POD and PPO activities are associated with the resistance of cotton to A.lucorum and that changes in defensive enzyme activity depend on the cotton variety and the kind of damage plants are subject to.