CHANGES OF CATALASE AND SOD ACTIVITIES IN THE EARLY RESPONSE OF TOMATO TO MELOIDOGYNE ATTACK
CHANGES OF CATALASE AND SOD ACTIVITIES IN THE EARLY RESPONSE OF TOMATO TO MELOIDOGYNE ATTACK
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番茄对根结线虫攻击早期反应中过氧化氢酶和SOD活性的变化
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
S. Molinari
中科院分区：
文献类型：
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作者：
S. Molinari
将带有 Mi 的抗性番茄切下的根接种根结线虫属。在琼脂中。接种后 24 小时即可检测到抗氧化酶活性的变化。过氧化氢酶活性受到感染的抑制。将幼苗接种到装有第二阶段幼体的盆中24小时后，还在根中观察到过氧化氢酶抑制。过氧化氢酶抑制对于抗性品种具有特异性，而敏感品种的过氧化氢酶含量因根结线虫侵染而增加。由于线虫侵染，超氧化物歧化酶活性没有表现出可重复的变化。过氧化氢酶抑制被认为是一种机制，通过该机制，抗性根中的过氧化氢水平增加，从而引发过敏反应并产生对线虫的化学毒性。
Excised roots of Mi-bearing resistant tomato were inoculated with Meloidogyne spp. in agar. Variations of antioxidant enzyme activity were detected as early as 24 hours after the inoculation. Catalase activity was inhibited by the infestation. Catalase inhibition was also observed in roots 24 hours after seedlings were inoculated in pots with second-stage juveniles. The catalase inhibition was specific for resistant cultivars whilst susceptible cultivars had their catalase content enhances by root-knot nematode infestation. Superoxide dismutase activity did not show reproducible changes due to nematode infestation. Catalase inhibition is indicated as a mechanism by which hydrogen peroxide level is increased in resistant roots thus triggering a hypersensitive response and producing a chemical toxic to nematodes.