Clubroot Resistance and Linkage inBrassica campestris

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Abstract
The genetics of resistance in B. campestris to Plasmodiophora brassicae race 6 (defined with the Williams differential set) and possible linkage of genes for resistance with genes controlling phenotypic markers were investigated with rapidly flowering stocks. Two B. campestris members of the European Clubroot Differential (ECD) host series and stock derived from B. campestris ssp. pekinensis ''Michihili'' were sources of clubroot resistance genes. The resistant reaction in ''Michihili'' stocks was due to a single dominant gene, designated Pb1. The resistant reaction in ECD stocks was due to more than one independent dominant gene in each stock. The 2 single dominant genes Pb2 and Pb3 were identified from ECD 02 and 03, respectively. Pb1, Pb2 and Pb3 were unlinked. Four recessive marker genes were not closely linked with any of the 3 genes for resistance although loose linkage may occur between PB3 and pk1, and Pb2 and ro.

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