Resistance to Plasmodiophora brassicae in Brassica rapa and Brassica juncea genotypes From China

• DOI: 10.1094/pdis-08-14-0863-re
• Publication Date: 2014-11-20T18:07:10Z
• Authors: Hui Zhang; Jie Feng; Shujiang Zhang; Shifan Zhang; Fei Li; Stephen E. Strelkov; Rifei Sun; Sheau-Fang Hwang
• Keywords: Clubroot; Brassica rapa

Clubroot disease, caused by Plasmodiophora brassicae Woronin, has become a major problem in cruciferous crops worldwide. Chinese cabbage (Brassica rapa), pak choi (B. and mustard juncea) are important vegetable China. Development of clubroot-resistant cultivars these is urgently needed. In this study, 71 B. rapa juncea genotypes from China, including inbred lines, were evaluated for resistance to three P. pathotypes. A significant interaction was observed between the pathotypes Brassica genotypes. Pathotype 3, as defined on differentials Williams, exhibited weakest virulence all plant material. By contrast, 5 6 both highly pathogenic most tested all, 10 14 resistant pathotypes, while 4 only specific pathotype. Seven eight progenies obtained selfing pathotype 3 but susceptible 6. Most lines their susceptibility lower than