环境因素对禾谷丝核菌菌核形成的影响

Influences of Environmental Factors on the Sclerotium Formation of Rhizoctonia cerealis Vander Hoeven

为了探讨影响禾谷丝核菌（R．cerealis）菌核形成的主要因素，在不同温度、培养基酸碱度、光照、碳氮营养等条件下对R．cerealis的生长状况和菌核形式进行了观察和分析。结果表明，温度、pH值、光照、碳氮营养对R．cerealis菌核的形成均有极显著影响。R．cerealis菌核形成的适宜温度为18～25℃，适宜pH值为5．0～7．0，暗培养或光暗交替培养有利于菌核形成；在碳、氮营养中，葡萄糖和NO3^--N最有利于R．cerealis菌核的形成，L-脯氨酸和L-亮氨酸可抑制菌核形成，但对菌丝生长无不良影响。

The major environmental factors on the sclerotium formation of Rhizoctonia cerealis Vander Hoeven were study through investigating the growth of Rhizoctonia cerealis Vander Hoeven at different conditions of temperature, light, carbon and nitrogen nutrients and pH in the culture media. The results indicated that there were significant influences of temperature light, pH and nutrients in the media on the growth of Rhizoctonia cerealis Vander Hoeven. It have been found that the favorable conditions to sclerotium forming were in 18-25 ℃, pH 5.0-7.0, dark or dark and light alternately. In carbon and nitrogen culture medium, glucose and NO3-N were positive to sclerotium forming of R. cerealis while L-proline and L- leucine were negative but did not affect hypha growing.