Quantitative trait locus (QTL) analysis and fine-mapping for Fusarium oxysporum disease resistance in Raphanus sativus using GRAS-Di technology

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  • Ezeah Chukwunonso Sylvanus Austin
    Laboratory of Plant breeding, Graduate School of Science and Technology, Niigata University Federal Department of Agriculture, Federal Ministry of Agriculture and Rural Development
  • Shimazu Juichi
    Nanto Seed Co., Ltd.
  • Kawanabe Takahiro
    School of Agriculture, Tokai University
  • Shimizu Motoki
    Iwate Biotechnology Research Center
  • Kawashima Shinichi
    Nanto Seed Co., Ltd.
  • Kaji Makoto
    Watanabe Seed Co., Ltd.
  • Ezinma Charles Onyemaechi
    Federal Department of Agriculture, Federal Ministry of Agriculture and Rural Development
  • Nuruzzaman Md
    Laboratory of Plant breeding, Graduate School of Science and Technology, Niigata University Department of Genetics and Plant Breeding, Bangladesh Agricultural University
  • Minato Nami
    Laboratory of Plant breeding, Graduate School of Science and Technology, Niigata University
  • Fukai Eigo
    Laboratory of Plant breeding, Graduate School of Science and Technology, Niigata University
  • Okazaki Keiichi
    Laboratory of Plant breeding, Graduate School of Science and Technology, Niigata University

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  • Quantitative trait locus (QTL) analysis and fine-mapping for <i>Fusarium oxysporum</i> disease resistance in <i>Raphanus sativus</i> using GRAS-Di technology

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<p>Fusarium wilt is a significant disease in radish, but the genetic mechanisms controlling yellows resistance (YR) are not well understood. This study aimed to identify YR-QTLs and to fine-map one of them using F2:3 populations developed from resistant and susceptible radish parents. In this study, two high-density genetic maps each containing shared co-dominant markers and either female or male dominant markers that spanned 988.6 and 1127.5 cM with average marker densities of 1.40 and 1.53 cM, respectively, were generated using Genotyping by Random Amplicon Sequencing-Direct (GRAS-Di) technology. We identified two YR-QTLs on chromosome R2 and R7, and designated the latter as ForRs1 as the major QTL. Fine mapping narrowed down the ForRs1 locus to a 195 kb region. Among the 16 predicted genes in the delimited region, 4 genes including two receptor-like protein and -kinase genes (RLP/RLK) were identified as prime candidates for ForRs1 based on the nucleotide sequence comparisons between the parents and their predicted functions. This study is the first to use a GRAS-Di for genetic map construction of cruciferous crops and fine map the YR-QTL on the R7 chromosome of radish. These findings will provide groundbreaking insights into radish YR breeding and understanding the genetics of YR mechanism.</p>

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