【摘要】 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。更多还原

【Abstract】 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. β-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.更多还原