Root surface-inhabiting bacteria and the expression of clubroot of radish in controlled environments |
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| Authors: | TK Kroll GH Lacy LD Moore |
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| Institution: | Department of Plant Pathology, Physiology and Weed Science, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, U.S.A. |
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| Abstract: | The effect of bacteria on the expression of clubroot of radish caused by the obligate parasite, Plasmodiophora brassicae, was studied. Inoculations with the bacterial strains isolated from roots of radish plants increased slightly, decreased slightly or did not change the number of root hairs colonized by P. brassicae in the root hair, i.e. primary phase of colonization. Five of six bacterial strains decreased the incidence of clubroot which was associated with a decrease in the extent of P. brassicae -colonization of the stele, i.e. secondary phase colonization. The role of root surface-inhabiting bacteria in clubroot disease development in radish under controlled environmental conditions is discussed. |
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