花生体内几种酶的活性与抗锈病性的关系

在锈菌侵染前和侵染后的若干阶段测定了具有不同程度抗性的5个花生品种中的苯丙氨酸解氢酶(PAL),过氧化物酶(PO),多酚氧化酶(PPO)活性,并分析其与抗性的关系。结果表明,PAL是一种诱导酶,在测定的大多数时间内,呈现酶活性越大,抗性越强的趋势;在侵染后的12,24和48h,大多数品种病叶的PO活性高于健叶,基本上是品种愈感病酶活性变化愈大;在健康叶片中,PPO的活性变化与抗锈病性显著相关,但在受锈菌侵染的叶片组织中,PPO的活性变化似与抗性无明显相关。

RELATIONSHIPS BETWEEN ACTIVITY OF SEVERAL ENZYMES AND PEANUT RESISTANCE TO RUST

At several stages before and after infection by rust fungus ( Puccoda arachidcs ) .analysis was made of the activities of several enzymes, including phenylalanine ammonia lyase ( PAL). peroxida.se (PO) and polyphenodoxidase ( PPO), in five cultivars of peanut ( Arachis hypogaea Linn. ) with different levels of resistance, and their relationships to resistance. PAL was an induced enzyme, whose activity could only be observed after infection ,and was found to be positively related to resistance. The level of PO activity in infected plants was higher than that in healthy ones in most cultivars at 12,24,and 48 horus after infection, the more susceptible the cultivar.ihe more its change in infected plants. PPO activity in healthy plants was significantly related to resistance of the cultivars,but no relationship was found bwtween its activity and resistance in infected tissues.