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作 者 ：魏国强;朱祝军;钱琼秋;李娟

期 刊 ：植物营养与肥料学报 2004年 10卷 2期 页码：202-205

关键词：黄瓜；白粉病；硅；酶活性；酚类物质；

Keywords:cucumber, powdery mildew, silicon, enzymes activity, phenolic compound,

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。

Abstract: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.

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