Identification of two loci for resistance to clubroot (<Emphasis Type="Italic">Plasmodiophora brassicae</Emphasis> Woronin) in <Emphasis Type="Italic">Brassica rapa</Emphasis> L. |
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| Authors: | K?Suwabe H?Tsukazaki H?Iketani K?Hatakeyama M?Fujimura T?Nunome H?Fukuoka Email author" target="_blank">S?MatsumotoEmail author M?Hirai |
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| Institution: | (1) National Institute of Vegetable and Tea Science (NIVTS), 360 Kusawa, Ano, Age, Mie 514-2392, Japan,;(2) National Agricultural Research Organization, 3-1-1 Kannon-dai, Tsukuba, Ibaraki 305-8517, Japan,;(3) Present address: Faculty of Agriculture, University of Kyoto prefecture, Kitainaazuma, Seika, Kyoto 619-0244, Japan, |
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| Abstract: | In an analysis of 114 F2 individuals from a cross between clubroot-resistant and susceptible lines of Brassica rapa L., 'G004' and 'Hakusai Chukanbohon Nou 7' (A9709), respectively, we identified two loci, Crr1 and Crr2, for clubroot (caused by Plasmodiophora brassicae Woronin) resistance. Each locus segregated independently among the F2 population, indicating that the loci reside on a different region of chromosomes or on different chromosomes. Genetic analysis showed that each locus had little effect on clubroot resistance by itself, indicating that these two loci are complementary for clubroot resistance. The resistance to clubroot was much stronger when both loci were homozygous for resistant alleles than when they were heterozygous. These results indicate that clubroot resistance in B. rapa is under oligogenic control and at least two loci are necessary for resistance.Communicated by H.C. Becker |
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| Keywords: | Brassica rapa Clubroot Microsatellites (SSRs) Plasmodiophora brassicae Disease resistance |
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