摘要
1984～1986年从田间采集的具有典型纹枯病症状的水稻、玉米、大豆、花生、小麦和立(木占)症状的棉苗等作物上分离的12个丝核菌菌株,从病菌无性时期的形态、细胞核、培养性状、菌丝亲和力、交互接种等诸方面进行了比较研究,结果表明,这些菌株均符合Darmeter等1965年所叙述的R.solani的形态特征,且幼龄菌丝中细胞是多核的,应视为同种,但不同寄主上的菌株在培养性状、菌丝亲和力、交互接种的感病情况仍存在一定差异,可视为不同类群,根据试验结果,初步提出了湖南上述作物水旱轮作换茬的种类布局,为栽培措施防病提供依据。
A comparison in morphological differences of the mycelia andother properties of rhizoctonia Solani causing sheath blight in rice, maize, soy-bean, peanut, wheat and cotton was made during 1984~1986. The result in-dicated that the fungi parasitizing the six crops can be divided into the follow-ing groups of the same species. The fungi causing rice sheath blight are similarto those causing maize sheath blight and they belong to the same group.The fungi in wheat and cotton arc similar and form another group. The fungiin soybean are different from those in peanut in some properties. They seemto be of different groups. In agricultural practice of Hunan, it is consideredthat the peanut, wheat and cotton used in rotation with rice or maize separatelywould decrease the sheath blight infection.
关键词
作物
丝核菌属
形态
细胞核
培养
crop
rhizoctonia
morphology
cell nucleus
culture
compatibility
inoculation
