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Pathogenicity of Plasmodiophora brassicae populations from small, spheroid, resistant-type clubroot galls on roots of clubroot-resistant cultivars of Chinese cabbage (Brassica rapa L. subsp. pekinensis)

Journal of General Plant Pathology volume 74, pages 242–245 (2008)Cite this article

Abstract

A resistant type of small, spheroid clubroot galls (SSGs) containing resting spores formed on the root surface of clubroot-resistant (CR) cultivars of Chinese cabbage (Brassica rapa L. subsp. pekinensis) inoculated with an avirulent population of Plasmodiophora  brassicae. Populations isolated from the SSGs severely affected a common (susceptible) cultivar but did not have the typical pathogenicity on CR cultivars, indicating similarity in pathogenicity between SSG and original spore populaions. Populations pathogenic on CR cultivars were not detected from SSGs. Therefore, the ability of the avirulent population among the SSGs to form resting spores may need to be considered to achieve clubroot control in common cultivars of crucifers.

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Authors and Affiliations

  1. The United Graduate School of Agricultural Sciences, Tottori University, Koyama-machi Minami 4-101, Tottori, 680-8533, Japan

    Kohei Osaki

  2. Department of Biological and Environmental Sciences, Faculty of Agriculture, Yamaguchi University, Yoshida 1677-1, Yamaguchi, 753-8515, Japan

    Shuhei Tanaka & Shin-ichi Ito

Authors
  1. Kohei Osaki
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  2. Shuhei Tanaka
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  3. Shin-ichi Ito
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Correspondence to Shuhei Tanaka.

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Osaki, K., Tanaka, S. & Ito, Si. Pathogenicity of Plasmodiophora brassicae populations from small, spheroid, resistant-type clubroot galls on roots of clubroot-resistant cultivars of Chinese cabbage (Brassica rapa L. subsp. pekinensis). J Gen Plant Pathol 74, 242–245 (2008). https://doi.org/10.1007/s10327-008-0092-6

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  • DOI: https://doi.org/10.1007/s10327-008-0092-6

Keywords

  • Clubroot-resistant cultivars
  • Avirulent population
  • Plasmodiophora brassicae
  • Resistant reaction
  • Resistant-type clubroot gall