Evaluation of pathogenicity difference of Plasmodiophora brassicae in Yunnan

doi:10.14088/j.cnki.issn0439-8114.2025.12.019

Abstract

Abstract: Based on an optimized inoculation and identification method for Plasmodiophora brassicae Woronin, five representative strains of the clubroot pathogen from Yunnan Province were selected for indoor inoculation assays to clarify differences in pathogenicity among the strains. Two host materials, Juxin Chinese Cabbage (a highly clubroot-susceptible Chinese cabbage cultivar) and Huayouza 62R (a Brassica napus cultivar highly resistant to physiological race 4 of Plasmodiophora brassicae), were used as inoculation recipients. Pathogenicity differences among the strains were evaluated by analyzing disease incidence and pathogen infection rates. The results showed that infection rates of the different strains on both Juxin Chinese Cabbage and Huayouza 62R differed significantly. Furthermore, the infection rates of all strains increased significantly over the investigation period, but the variation trends in infection rates among strains showed clear differences between the two hosts as the inoculation period extended.

Key words: Plasmodiophora brassicae Woronin, inoculation method, pathogenicity analysis, difference, evaluation, Yunnan Province

CLC Number:

S435.654

ZHANG Shun-rong, LUO Yan-qing, LIU Ya-jun, ZHANG Yun-yun, GAO Jin-xiang, ZHANG Yu-song, YANG Hui, CHENG Xiao-mao, ZU Feng. Evaluation of pathogenicity difference of Plasmodiophora brassicae in Yunnan[J]. HUBEI AGRICULTURAL SCIENCES, 2025, 64(12): 110-116.

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