几种化学制剂对番木瓜抗环斑病毒和防御酶活性的影响

研究几种化学制剂对番木瓜抗环斑病毒和叶片中防御酶活性影响的结果表明，接种番木瓜环斑病毒后，植株叶中多酚氧化酶（PPO）、超氧化物歧化酶（SOD）和过氧化物酶（POD）的活性均明显升高，其中PPO和POD总体的升高幅度大，SOD的总体升幅较小；病毒必克的升幅较大，83增抗剂和水杨酸的升幅较小。83增抗剂、水杨酸和病毒必克均能使番木瓜叶中PPO、SOD和POD活性持续升高，有效减轻了环斑病的病情，防治效果依次为83增抗剂〉水杨酸〉病毒必克。

Effects of Several Chemicals on Preventing Papaya Ringspot Virus and Defensing Enzyme Activities in Papaya Leaves

Effects of several chemicals on papaya ringspot virus （PRSV） and relative defensing enzyme activities in papaya leaves were studied. After the leaves were treated with viruside, 83-fatty acid and salicylic acid respectively, PRSV was inoculated to a part of plants. The results showed that the activities of polyphenol oxidase （PPO）, superoxide dismutase （SOD） and peroxidase （POD） in leaves of papaya all increased after PRSV inoculation, PPO and POD increased more and SOD increased little; those with viruside increased more and those with 83-fatty acid and salicylic acid increased little. All of viruside, 83-fatty acid and salicylic acid could activate PPO, POD and SOD. Thus the PRSV resistance increased and the papaya ringspot virus levels were controled effectively. The 83-fatty acid was more efficient in virus resistance than the salicylic acid, and the salicylic acid was more efficient in virus resistance than viruside.