Pyramiding of Two Kinds of Phosphorus-deficiency Induced QTLs Derived from an Indica Rice Variety 'Kasalath' to 'Koshihikari'

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  • Yamamoto Tatsuya
    Graduate school of Environmental Science, The University of Shiga Prefecture
  • Kokaji Hiroyuki
    Graduate school of Environmental Science, The University of Shiga Prefecture
  • Tabata Yuki
    Graduate school of Environmental Science, The University of Shiga Prefecture
  • Iimura Yasuo
    Graduate school of Environmental Science, The University of Shiga Prefecture
  • Shimizu Akifumi
    Graduate school of Environmental Science, The University of Shiga Prefecture

Bibliographic Information

Other Title
  • 水稲インディカ品種Kasalathに由来する2種類の低リン応答性QTLの,コシヒカリへの集積
  • スイトウ インディカ ヒンシュ Kasalath ニ ユライ スル 2シュルイ ノ テイリン オウトウセイ QTL ノ,コシヒカリ エ ノ シュウセキ

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Description

Phosphorus (P) is a macronutrient in plants. Plants usually suffer from P-deficiency stress because most of fertilized P in soil is rapidly fixed to unavailable forms to plants. Breeding tolerant varieties which are able to uptake and/or use P efficiently, is an effective solution to the stress and it also contributes to P resource saving in future. In this study, pyramiding of two kinds of P-deficiency induced QTL, qREP-6 and qACP-8 was conducted to improve an elite Japanese rice variety 'Koshihikari' by using crosses between substituted lines (SL) having an indica variety 'Kasalath' segments on chromosome 6 and 8. In P-deficient solution experiment, Kasalath allele of qREP-6 and qACP-8 showed significant increase of root length and acid phosphatase activity in lower leaves, respectively, and their interaction was detected for P content of youngest fully expanded leaf using SL-F2. In low P field experiment, a SL-F3 line having Kasalath alleles of both QTLs showed significant increase of panicle number and weight. These results indicated that QTL pyramiding improved P deficiency tolerance of Koshihikari.

Journal

  • Journal of Crop Research

    Journal of Crop Research 60 (0), 31-35, 2015

    The Society of Crop Science and Breeding in Kinki, Japan

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