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研究了6种不同氮营养水平下炭疽病菌对菜心叶片超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)活性的影响及其与抗病性的关系.结果表明,适宜的氮营养处理(N3处理)可提高植株的耐病能力,病情指数降低.氮营养对植株细胞保护酶系统有明显的影响,炭疽病菌对SOD、POD、CAT活性有明显的诱导调节作用.接种后,适宜氮营养比高氮、低氮或不施肥可加强炭疽病菌对POD活性的诱导和抑制炭疽病菌在前期对SOD活性的诱导,但在后期则加强了对SOD活性的诱导.不同氮营养下炭疽病菌对CAT的诱导调控作用不同,不施肥或较高的氮营养在致病过程中都显著地提高CAT活性,但适宜氮营养下只是前期具有明显的促进作用,后期逐渐转化为抑制作用.
The effects of anthracnose on the activity of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) in Brassica campestris leaves under 6 different nitrogen levels and their relationship with disease resistance The results showed that proper nitrogen nutrition (N3 treatment) could improve plant disease resistance and reduce disease index.Nitrogen nutrition had a significant effect on plant cell protective enzyme system, and anthrax bacteria induced obvious activity of SOD, POD and CAT After nitrogen inoculation, the suitable nitrogen nutrition could enhance the induction of POD activity by anthracnose pathogen and inhibit the activity of anthracnose pathogen in the early stage, but enhance the induction of SOD activity at the later stage. Under the different nitrogen nutrition, anthracnose had different effects on the induction of CAT. No fertilization or higher N nutrition significantly increased the activity of CAT during the pathogenicity process, but only suitable for nitrogen nutrition, Into inhibition.