Wei Guoqiang, Zhu Zhujun, Li Juan, Yao Qiuju
State Agriculture Ministry Laboratory of Horticultural Plant Growth Development and Biotechnology, Department of Horticulture, Zhejiang University, Hangzhou 310029, China.
Ying Yong Sheng Tai Xue Bao. 2004 Nov;15(11):2147-51.
By the method of hydroponic culture, this paper studied the effects of soluble silicon (Si) supply and Sphaerotheca fuliginea inoculation on the active oxygen metabolism, SiO2 content and disease resistance of a susceptible cultivar. The results showed that the O2*- producing rate and H2O2 and MDA contents of cucumber leaf were increased by Sphaerotheca fuliginea inoculation, but reduced by the inoculation plus Si supply. The inoculation enhanced the catalase (CAT) and peroxidase (POD) activities in plant leaves but decreased their superoxide dismutase (SOD) activity, while inoculation plus Si supply increased the activities of these enzymes. Inoculation increased the scorbate (AsA) and glutathione (GSH) contents in plant leaves. The AsA content in Si-supplied plant leaves was lower than that of Si-deprived ones, whereas the GSH content was in reverse. Whether inoculated or not, the SiO2 content in Si-supplied plant leaves was significantly higher than that of Si-deprived ones. The disease index was significantly decreased by Si-supply.
采用水培法，研究了供硅（Si）及接种瓜白粉菌对感病品种活性氧代谢、二氧化硅含量及抗病性的影响。结果表明，接种瓜白粉菌提高了黄瓜叶片的超氧阴离子产生速率、过氧化氢和丙二醛含量，但接种加供硅处理降低了这些指标。接种增强了植物叶片中的过氧化氢酶（CAT）和过氧化物酶（POD）活性，但降低了超氧化物歧化酶（SOD）活性，而接种加供硅处理提高了这些酶的活性。接种增加了植物叶片中抗坏血酸（AsA）和谷胱甘肽（GSH）的含量。供硅植株叶片中AsA含量低于不供硅植株，而GSH含量则相反。无论是否接种，供硅植株叶片中的二氧化硅含量均显著高于不供硅植株。供硅显著降低了病情指数。
