云南高原粳稻区白叶枯病菌的致病型初步鉴定

利用采自云南高原粳稻区病叶分离的17份水稻白叶枯病菌株，在30份水稻品种上接种进行致病型初步鉴定。研究表明可以将17个菌株分为7个致病型（Ⅰ~Ⅶ），其中Ⅴ型菌为云南高原粳稻区的优势菌群。初步构建了一套包含7个品种（黄玉、毫糯扬、TN1、珍珠矮、IR26、南粳33、金南风）的高原粳稻白叶枯病菌的鉴别品种，明确了7个致病型在这套鉴别品种上的反应型。早生爱国3号(Xa-3)、IR1545-339(xa-5)、IRBB21（Xa-21）、扎昌龙（Xa-22t，Xa-24t）对所接种菌均表现抗病，在云南高原粳稻育种中具有较好的利用前景。

Preliminary Evaluation of Pathotypes of Xanthomonas oryzae pv. Oryzae in Japonica Rice Region of Yunnan Plateau

Seventeen isolates of Xanthomonas oryzae pv. oryzae collected from japonica rice grown in the Yunnan plateau region were preliminary classified into 7 pathotypes according to the pathogenic reactions on 30 rice varieties tested. The 7 pathotypes were named as pathotype Ⅰ to pathotype Ⅶ. The pathotype Ⅴ is an epidemic one in the Yunnan plateau rice region now. Seven rice varieties are considered as a set of differential varieties for bacterial blight race in the Yunnan plateau japonica rice, i.e. Kogyoku, Haonuoyang, TN1, Zhenzhu′ai, IR26, Nanjing 33 and Kinmaze . The disease reactions of the 7 pathotypes were determined on the set of differential varieties. The varieties Wase Aikoku 3 (Xa-3), IR1545-339(xa-5), IRBB21(Xa-21), and Zhachanglong (Xa-22^t, Xa-24^t) were resistant to all strains tested, and useful for resistance breeding in Yunnan Province.