Zhang Hui, Feng Jie, Zhang Shujiang, Zhang Shifan, Li Fei, Strelkov Stephen E, Sun Rifei, Hwang Sheau-Fang
The Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, and Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta T6G 2P5, Canada.
Crop Diversification Centre North, Alberta Agriculture and Rural Development, Edmonton, Alberta T5Y 6H3, Canada.
Plant Dis. 2015 Jun;99(6):776-779. doi: 10.1094/PDIS-08-14-0863-RE. Epub 2015 May 15.
Clubroot disease, caused by Plasmodiophora brassicae Woronin, has become a major problem in cruciferous crops worldwide. Chinese cabbage (Brassica rapa), pak choi (B. rapa), and mustard (B. juncea) are important vegetable crops in China. Development of clubroot-resistant cultivars of these crops is urgently needed. In this study, 71 B. rapa and B. juncea genotypes from China, including cultivars and inbred lines, were evaluated for resistance to three P. brassicae pathotypes. A significant interaction was observed between the P. brassicae pathotypes and the Brassica genotypes. Pathotype 3, as defined on the differentials of Williams, exhibited the weakest virulence on all plant material. By contrast, pathotypes 5 and 6 were both highly pathogenic on most of the tested genotypes. In all, 10 of the 14 Chinese cabbage cultivars were resistant to all three pathotypes, while 4 were resistant only to a specific pathotype. Seven of eight progenies obtained from the selfing of Chinese cabbage cultivars were resistant to pathotype 3 but most were susceptible to pathotypes 5 and 6. Most inbred lines of Chinese cabbage and all inbred lines of pak choi and mustard were susceptible to all three pathotypes but their susceptibility was lower to pathotype 3 than to pathotypes 5 and 6.
根肿病由芸苔根肿菌沃罗宁引起，已成为全球十字花科作物的一个主要问题。大白菜（芜菁）、小白菜（芜菁）和芥菜（芥菜）是中国重要的蔬菜作物。迫切需要培育这些作物的抗根肿病品种。在本研究中，对来自中国的71个芜菁和芥菜基因型（包括品种和自交系）进行了对三种芸苔根肿菌致病型的抗性评估。观察到芸苔根肿菌致病型与芸苔基因型之间存在显著的相互作用。根据威廉姆斯鉴别品种所定义的致病型3，对所有植物材料的毒力最弱。相比之下，致病型5和6对大多数测试基因型都具有高致病性。在14个大白菜品种中，有10个对所有三种致病型都具有抗性，而有4个仅对特定致病型具有抗性。从大白菜品种自交获得的8个后代中，有7个对致病型3具有抗性，但大多数对致病型5和6敏感。大多数大白菜自交系以及所有小白菜和芥菜自交系对所有三种致病型都敏感，但它们对致病型3的敏感性低于对致病型5和6的敏感性。
