棉铃疫病菌的生物学特性及其遗传研究

Biological Characters and Inheritance of the Causal Organism of Cotton Boll Blight

在实验室条件下,对安徽省棉铃疫病菌(PhytophthoraboehmeriaeSawada)的若干生物学特性及其遗传进行了研究。结果表明,采自不同地区的棉铃疫病菌生长速率和对棉苗的致病力间均存在极显著差异,甚至采自同一地区的不同菌株间上述性状亦存在显著差异。同时,XC-6生长速率、对棉苗的致病力、菌落形态及同宗配合遗传和变异特性研究表明,其生长速率和对棉苗的致病力性状在单游动孢子后代和自交后代均不能稳定遗传,但菌落形态和同宗配合特性在单游动孢子后代和自交后代均能稳定遗传,提示上述性状在单游动孢子后代和自交后代的遗传和变异特性可能与菌株长期自交和种内杂交有关。

Some biological characters and its inheritance of the causal organism of cotton boll Anhui were studied in vitro. The results showed that the growth-rate and seedlings of all tested strains in different regions displayed obvious difference, pathogenicity and even in blight in to cotton the same region. And it also showed that the inheritance of the growth-rate and pathogenicity to cotton seedlings of XC-6 could not be inherited steadily in zoospore progenies and oospore progeny, but the colony morphology and homothallic character of XC-6 could inherited steadily in both asexual and sexual progenies, which suggested that the inheritance and variation of the above characters might be related to long-selfing and hybridization in species.