甜瓜白粉病抗性反应中相关防御酶活性的变化

在人工接种条件下,通过测定接种后过氧化物酶(POD)、过氧化氢酶(CAT)、多酚氧化酶(PPO)的活性,研究了甜瓜白粉病抗性反应中相关防御酶活性变化.结果表明,抗、感品种对照的POD、CAT、PPO酶活性无明显差异.接种后,它们的3种酶活性都比对照提高;抗性品种CAT活性高于感病品种;感病品种POD活性高于抗性品种;直到接种后5天,抗病品种PPO活性才超过感病品种,并呈上升趋势.

Changes of Related Defense Enzyme Activity in Resistance to Melon Powdery Mildew

The changes of related defense enzyme activity in the resistant reaction to melon powdery mildew were studied through determined the activity of POD, CAT, PPO after artificial inoculation. The results showed that activity of POD, CAT, PPO had no obvious difference between resitant and susceptible control.The three kind of enzyme activity all increased compared with their control after inoculation. CAT activity of resistant variety was higher than susceptible variety. POD activity is opposite. PPO activity of resistant variety was higher than susceptible variety until five days after inoculation.