High-resolution mapping and characterization of <i>xa42</i>, a resistance gene against multiple <i>Xanthomonas oryzae</i> pv. <i>oryzae</i> races in rice (<i>Oryza sativa</i> L.)

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  • Busungu Constantine
    United Graduate School of Agricultural Sciences, Kagoshima University
  • Taura Satoru
    Institute of Gene Research, Kagoshima University
  • Sakagami Jun-Ichi
    United Graduate School of Agricultural Sciences, Kagoshima University Faculty of Agriculture, Kagoshima University
  • Anai Toyoaki
    United Graduate School of Agricultural Sciences, Kagoshima University Faculty of Agriculture, Saga University
  • Ichitani Katsuyuki
    United Graduate School of Agricultural Sciences, Kagoshima University Faculty of Agriculture, Kagoshima University

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  • High-resolution mapping and characterization of xa42, a resistance gene against multiple Xanthomonas oryzae pv. oryzae races in rice (Oryza sativa L.)

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<p>Improvement of resistance against rice bacterial blight (BB) disease is an important breeding strategy in breeding programs across the world, especially in Africa and southern Asia where BB is more prevalent. This report describes a high-resolution map and characterization of xa42 at XA42 locus, a rice BB resistance gene in XM14, a mutant line originating from IR24. The candidate gene region was narrowed down from 582 kb, which had been obtained in our previous study, to 57 kb. XM14 shows brown spots in its leaves like lesion mimic mutants. This line also shows a shorter stature than the original cultivar IR24. In XA42 gene segregating populations, homozygotes of xa42 allele were consistently resistant to the six Japanese Xanthomonas oryzae pv. oryzae races used for this study. They also showed brown spots and markedly short stature compared with the other genotypes, suggesting that xa42 gene exhibits pleiotropic effects.</p>

Journal

  • Breeding Science

    Breeding Science 68 (2), 188-199, 2018

    Japanese Society of Breeding

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