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Identification of a gene in Arabidopsis thaliana controlling resistance to clubroot (Plasmodiophora brassicae) and characterization of the resistance response

, : Identification of a gene in Arabidopsis thaliana controlling resistance to clubroot (Plasmodiophora brassicae) and characterization of the resistance response. Molecular Plant Microbe Interactions 9(2): 91-97

Plasmodiophora brassicae, the causal agent of clubroot, is known to be pathogenic on Arabidopsis thaliana. We identified for the first time pathotype-specific resistance to clubroot in Arabidopsis. Ecotypes Tsu-0 and Ze-0 showed incompatible interactions to one isolate (isolate e) of the pathogen, but not three others tested. The resistance reaction is characterized by the lack of typical clubroot swellings after infection. Microscopical investigations revealed that resistance is accompanied by a hypersensitive reaction (HR). Cell wall alterations associated with the HR were detectable as autofluorescent substances. Positive phloroglucinol-HCl staining suggests a lignification of cell walls involved in defense reaction. By genetic analysis, we found that resistance to P. brassicae isolate e is conferred by a dominant allele of a single nuclear gene that we designated RPB1. With the aid of morphological markers this locus was mapped near the marker dis2 to chromosome 1.

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