两种硅化物对甜瓜白粉病的抑制机理研究

 以玉金香甜瓜为试验材料，研究不同硅化物对白粉病的抑制机理。结果表明，2种硅化物处理均能显著降低甜瓜幼苗白粉病的严重度，以硅酸钠降低的幅度最大。经20 mmol·L-1硅酸钠处理后和接种白粉菌后，甜瓜POD活性显著高于对照；GLU活性也于硅酸钠处理后120 h和接种白粉菌后120 h，显著高于对照。经SEM-EDX分析显示硅酸钠处理，其硅在叶面气孔和表皮层沉积明显提高。纳米氧化硅处理对POD酶活性没有明显影响，但硅的沉积特点与硅酸钠处理相似。

Inhibitory Mechanisms of Two Silicon Compounds on Mildew Powder of Melon

The seedlings of Melon Yujinxiang were used to study the effect and inhibitory mechanism of silicon compounds on mildew powder. The results showed that the severity of mildew powder of melon seedling decreased significantly by treatments with two silicon compounds. Sodium silicate was more effect on mildew powder than nanosized silicon. Sodium silicate increased. the activity of resistant-enzyme. Peroxidase (POD) activity was increased significantly by sodium silicate treatment after silicon treated and pathogen-inoculation. -1,3-glocosidase (GLU) activity increased significantly after 120 h of treatment by sodium silicate and 120 h after pathogen-inoculation. Silicon of sodium silicate treatment deposited obviously at stomata and epidermis. Nanosized silicon did not induce POD activity. And silicon deposition of nanosized silicon treatment was as the same as sodium silicate treatment.