云南水稻白叶枯病生理小种初析及鉴别品种的筛选

 从云南省10个地州40个县市的水稻白叶枯病标本中分离纯化得到115个水稻白叶枯病菌株。利用已知抗性基因的近等基因系,在孕穗期应用剪叶法接种明确其生理小种。并筛选出一套鉴别品种IRBB1,IRBB3,IRBB4,IRBB5,IRBB7,IRBB13,IRBB14,IRBB18,IRBB21. 云南省的水稻白叶枯病菌小种组成复杂,有自身的特殊性。已鉴定出25个小种,暂定名为YN1～YN25. 优势生理小种为YN1,YN13,YN21,其中YN13分布于楚雄、玉溪、红河、丽江等4个地区共8县（市）,YN21分布于大理、红河等地区。云南的小种多样性分布可能与它的地理条件有关。

Preliminary Analysis on Race of Xanthomonas oryzae pv.oryzae in Yunnan and Screening of Differential Varieties

One hundred and fifteen strains of Xanthomonas oryzae pv.oryzae (Xoo)on rice were collected from 40 counties in Yunnan Province. Based on virulence analysis using a set of near-isogenic lines,each harboring a single resistance gene,the uppermost fully open leaves were inoculated by clipping method. Nine rice near-isogenic lines were selected as a set of differential varieties for identifing Xoo pathotype(race) including IRBB1,IRBB3,IRBB4,IRBB5, IRBB7,IRBB13,IRBB14,IRBB18 and IRBB21. The strains were grouped into 25 races, designated YN1-N25 tentatively.Among them YN1,YN13 and YN21 were predominant. The race YN13 strains distributed in 8 counties of Chixiong,Yuxi,Honghe,Lijiang cities; The race YN21 strains distributed in Dali and Honghe prefecture and so on. The diversity and distribution of Xoo race in Yunnan were proably associated with the geographical conditions