Physiological Race Identification of Clubroot （Plasmodiphora braassicae Wor） from Changyang County，Hubei Province and Resistant Resource Screening for Chinese Cabbage Breeding
WANG Wei-hong，YU Yang-jun*，DING Yun-hua，ZHANG Feng-lan，YU Shuan-cang，ZHANG
De-shuang，ZHAO Xiu-yun，LU Gui-xiang
Beijing Vegetable Research Center， Beijing Academy of Agriculture and Forestry Sciences， Key Laboratory of Biology and Genetic Improvement of Horticultural Crops（North China）， Ministry of Agriculture， Beijing 100097，China
Abstract：Four isolates of clubroot（ Plasmodiphora braassicae Wor），collected from Changyang County Hubei Province，the infected Chinese cabbage，cabbage，radish were identified by Williams host system．The results indicated that all 4 isolates are belonged to physiological race No. 4 with strong virulence．44 varieties and 46 inbred lines of Chinese cabbage were inocul ated and screened using these isolates，4 varieties and 14 inbred lines were found to be resis tant.
