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从保存的4个单孢分离菌后代再分离若干单胞菌株,接种子国内7个鉴别品种上,又可以分成不同的小种。从6个单孢分离菌再分离的后代单孢菌株,分别对13个抗病品种作致病力测定,各后代单孢菌株仅对少数品种的致病力是一致的。从27个品种的小病斑或个别大病斑上分离的病菌,回接原品种后,有11个分离菌对原品种不致病。这些结果说明大多数分离菌对许多品种的致病力是易变的,只对少数品种的致病力保持相对稳定性。作者认为进行抗性遗传和抗性机制研究需要的致病力稳定分离菌,只能根据其对供试品种致病力的稳定性来选择,而不能按一组鉴别品种来选择。
Separation of several isolates from 4 progenies of the monospore isolated from inoculated plants were inoculated into 7 domestic cultivars and divided into different races. The virulence of 13 single disease resistant isolates from 6 isolates of monospore isolated from each isolates were determined. The virulence of each monosomyces strain was consistent with that of only a few cultivars. From 27 varieties of small lesions or isolated from the major pathogenic bacteria back to the original species, there are 11 isolates of the original species is not pathogenic. These results indicate that most of the isolates are mutagenic to many species and maintain relative stability only for the virulence of a few species. The authors believe that the pathogenicity-stable isolates required for genetic research on resistance and resistance mechanisms can only be selected according to their stability to the tested varieties of virulence, rather than a set of identification varieties.