硅对黄瓜白粉病抗性的影响及其生理机制  

Effect of silicon on resistance of cucumber powdery mildew and its physiological mechanism

作　　者：魏国强[1] 朱祝军[1] 钱琼秋[1] 李娟[1] 

机构地区：[1]浙江大学园艺系,浙江杭州310029

出　　处：《植物营养与肥料学报》2004年第2期202-205,共4页Journal of Plant Nutrition and Fertilizers

基　　金：863"高技术项目资助(2001AA247031)资助。

摘　　要：以黄瓜感病品种为材料,研究了施硅和诱导接种白粉菌对抗坏血酸过氧化物酶(AsA-POD)、脱氢抗坏血酸还原酶(DR)、苯丙氨酸解氨酶(PAL)、多酚氧化酶(PPO)活性与酚类物质含量变化的影响。结果表明:诱导接种后,营养液中加硅酸盐显著降低黄瓜白粉病病情指数,显著提高了黄瓜叶片中AsA-POD、PPO的活性,而DR、PAL活性低于不施硅处理,但差异不显著。施硅处理的酚类物质含量较高,并显著降低病情指数。Solution culture experiments was conducted with a susceptible cucumber cultivar to investigate the effects of soluble silicon and inoculation with Sphaerotheca fuliginea on activities of leaves ascorbate peroxidase(AsA-POD), dehydroascorbate reductase(DR),phenylalanine ammonia-lyase(PAL),polyphemol oxidase(PPO) and phenolic compound content in cucumber leaves. The results showed that the disease index after inoculation was significantly decreased by Si supplied(Si+). The activities of AsA-POD and PPO in the leaves of Si supplied(Si+) plants were significantly enhanced. The activities of DR and PAL in the leaves of Si deprived(Si-)plants were slightly higher than in those of Si supplied(Si+) plants,while no significant difference between them. The content of phenolic compound was higher in the leaves of Si supplied(Si+) plants than those of Si deprived(Si-) plants.

关 键 词：黄瓜 白粉病 抗病性 硅制剂 生理机制 抗坏血酸过氧化物酶 脱氢抗坏血酸还原酶 苯丙氨酸解氨酶 多酚氧化酶 酚类物质 

分 类 号：S436.421[农业科学—农业昆虫与害虫防治]