【摘要】 1982年,利用日本9个单基因的鉴别品种,把我国北方粳稻品种上分离的27个稻瘟病菌株(分属于4个中国小种)划分为11个小种。1983年,用清泽的12个鉴别品种测定了分属于7个中国小种的42个菌株。结果表明,42个分离菌中包括了19个日本小种。由此可以断定,日本鉴别品种和清泽鉴别品种具有比较高的鉴别生理小种的能力。利用由清泽鉴别品种任意选出的7个品种组成一套假设的鉴别品种,用三套假设的鉴别品种测定42个分离菌。前两套假设鉴别品种分别把42个菌株分为13个小种,后一套(?)品种划分42个菌株为9个小种。由这些结果可以断定,单基因的鉴别品种具有最高的小种鉴别能力。在理想的中国鉴别品种确立之前,可以利用清泽鉴别品种来研究我国北方稻作区的小种。它能为具已知抗病基因的抗病品种的布局提供有用的情报。更多还原

【Abstract】 27 isolates belonging to 4 Chinese races of blast fungus,which wereisolated from japonica varieties in North China,were divided into 11races by using 9 Japanese differential varieties with single resistancegene in 1982.42 isolates,classified into 7 Chinese races,were determ-ined by 12 Kiyosawa’s differential varieties in 1983.The result indicatedthat 19 Japanese races were included in 42 isolates.It can be concludedthat kiyosawa’s differential varieties and Japanese ones have higher abi-lity differentiating pathogenic races.Three sets of presumable differential varieties,any one of whichconsists of 7 varieties selecting at random from Kiyosawa’s differentialvarieties,were used to test 42 isolates.Former two sets can be divided 42isolates into 13 races respectively and later set into 9 races.Fromthese results,it can be concluded that differential variety with singleresistance gene has highest ability differentiating pathogenic races of blastfungus.Kiyosawa’s differential varieties can be used to study races in ricecropping regions of North China before ideal Chinese differential varie-ties are determined.It can provide useful information for distributionof resistant varieties with known resistance genes.更多还原