Lines for blast resistance genes with genetic background of Indica Group rice as international differential variety set

  • Yoshimichi Fukuta
    Japan International Research Center for Agricultural Sciences Tsukuba Japan
  • Yohei Koide
    Research Faculty of Agriculture Hokkaido University Sapporo Japan
  • Nobuya Kobayashi
    Institute of Crop Science National Agricultural and Food Research Organization Tsukuba Japan
  • Hiroshi Kato
    Core Technology Research Headquarters National Agricultural and Food Research Organization Tsukuba Japan
  • Hiroki Saito
    Tropical Agricultural Research Front Japan International Research Center for Agricultural Sciences Ishigaki Japan
  • Mary Jeanie Telebanco‐Yanoria
    International Rice Research Institute Los Baños The Philippines
  • Leodegario A. Ebron
    International Rice Research Institute Los Baños The Philippines
  • Doris Mercado‐Escueta
    Department of Agriculture and Water Resources Canberra Australian Capital Territory Australia
  • Hiroshi Tsunematsu
    Institute of Crop Science National Agricultural and Food Research Organization Tsukuba Japan
  • Ikuo Ando
    Hokkaido Agricultural Research Center National Agricultural and Food Research Organization Sapporo Japan
  • Daisuke Fujita
    Faculty of Agriculture Saga University Saga Japan
  • Mitsuhiro Obara
    Japan International Research Center for Agricultural Sciences Tsukuba Japan
  • Asami Tomita
    Graduate School of Environmental and Life Science Okayama University Okayama Japan
  • Nagao Hayashi
    Institute of Agrobiological Sciences National Agricultural and Food Research Organization Tsukuba Japan
  • Tokio Imbe
    National Agricultural and Food Research Organization Tsukuba Japan

Abstract

<jats:title>Abstract</jats:title><jats:p>Twenty‐one near‐isogenic lines (NILs) for 18 resistance genes—<jats:italic>Pia</jats:italic>, <jats:italic>Pii</jats:italic>, <jats:italic>Pi3</jats:italic>, <jats:italic>Pi5</jats:italic>(t), <jats:italic>Pik‐s</jats:italic> (two lines from two donors), <jats:italic>Pik‐m</jats:italic>, <jats:italic>Pi1</jats:italic>, <jats:italic>Pik‐h</jats:italic>, <jats:italic>Pik</jats:italic>, <jats:italic>Pik‐p</jats:italic>, <jats:italic>Pi7</jats:italic>(t), <jats:italic>Pi9</jats:italic>(t), <jats:italic>Piz</jats:italic>, <jats:italic>Piz‐5</jats:italic>, <jats:italic>Piz‐t</jats:italic>, <jats:italic>Pita‐2</jats:italic>, <jats:italic>Pita</jats:italic> (three donors) and <jats:italic>Pi20</jats:italic>(t)—to blast disease were developed through introduction into the genetic background of a semi‐dwarf susceptible rice line, US‐2, by recurrent backcross breeding. US‐2 is derived from a cross between an Indonesian Tropical Japonica Group cultivar, 'Kencana', and an improved high‐yielding and semi‐dwarf Indica Group cultivar, 'Takanari', bred in Japan. The reactions of US‐2 NILs to standard differential blast isolates were clearly defined than previous differential varieties (DVs) such as monogenic lines. US‐2 and its NILs are adapted well to wide environmental conditions from temperate to subtropical regions. They will be useful and easier to handle and manage as the first DV set with genetic background of Indica Group rice for pathology studies and as gene sources for rice breeding programme.</jats:p>

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