用中国与国际统一小麦条锈菌生理小种鉴定寄主小麦品种及西藏重要大小麦品种对侵染大麦的和侵染小麦的条锈菌致病性进行了比较研究。结果表明二群体之多数菌株不能侵染另一类寄主,表现为致病性是相互独立的。流行学的观察结果也证实如此。赞同将二者区分为条锈菌大麦专化型Puccinia striiformis f.sp.hordei>和小麦专化型(P.striiformis f.sp.tritici)的观点。专化型间共同寄主的存在可能为二者通过体细胞杂交产生新的变异体提供机会;解释了可能存在相互侵染的现象。 The pathogenicity of the stripe rust of the infected barley and the infected wheat was compared with the identification of the host wheat cultivars by Chinese and international single race of wheat stripe rust and the significant varieties of wheat of Tibet. The results showed that most of the two groups of strains can not infect another host, showing that the pathogenicity is independent of each other. The epidemiological observations also confirm this. In favor of the distinction between the two stripe rust barley specialized Puccinia striiformis f.sp.hordei> and wheat specific (P.striiformis f.sp.tritici) point of view. The existence of specialized co-hosts may provide opportunities for the two to generate new variants by somatic hybridization; this explains the possible presence of mutual infec- tion.