Mapping of QTLs Controlling Carbon Isotope Discrimination in the Photosynthetic System using Recombinant Inbred Lines Derived from a Cross between Two Different Rice(<i>Oryza sativa</i>L.) Cultivars

• Takai Toshiyuki

  Graduate School of Agriculture, Kyoto University

• Fukuta Yoshimichi

  Plant Breeding, Genetics and Biochemistry, International Rice Research Institute

• Sugimoto Atsuko

  Graduate School of Environmental Science, Hokkaido University

• Shiraiwa Tatsuhiko

  Graduate School of Agriculture, Kyoto University

• Horie Takeshi

  Graduate School of Agriculture, Kyoto University

書誌事項

タイトル別名

• Mapping of QTLs Controlling Carbon Isotope Discrimination in the Photosynthetic System using Recombinant Inbred Lines Derived from a Cross between Two Different Rice (Oryza sativa L.) Cultivars

抄録

Carbon isotope discrimination (Δ) occuring in the process of photosynthesis, shows variation among rice (Oryza sativa L.) cultivars. Elucidation of specific traits associated with the extent of this discrimination under irrigated conditions may be useful to improve photosynthetic ability in rice plants. We measured leaf photosynthesis and Δ in Milyang 23 and Akihikari, and conducted quantitative trait loci (QTL) analysis on Δ at heading stage using a population of 126 recombinant inbred lines (RILs), derived from a cross between the two cultivars. While the two parental cultivars showed a similar Δ, the RILs showed a wide variation in Δ including transgressive segregation. Seven QTLs were detected for Δ; four on chromosomes 2 (two regions), 7, and 11 were those for Δ that is increased by the Milyang 23 allele, whereas the other three on chromosomes 1, 2, and 6 were those for Δ that is increased by the Akihikari allele. These results suggest that ¹³C in Milyang 23 may be discriminated through a photosynthetic process different from that in Akihikari. Milyang 23 showed a higher stomatal conductance and a higher ratio of intercellular to ambient CO₂ concentration (Ci/Ca), while Akihikari showed a higher carboxylation efficiency but a lower Ci/Ca. According to the theory that a higher Ci/Ca leads to a higher Δ, the QTLs for Δ that is increased by the Milyang 23 allele might be related to a higher stomatal conductance. However, the theory provided no persuasive factors to explain the QTLs for Δ that is increased by the Akihikari allele. Plausible factors associated with these QTLs are discussed.

収録刊行物

• Plant Production Science

  Plant Production Science 9 (3), 271-280, 2006

  日本作物学会

キーワード

• Carbon isotope discrimination (Δ)
• Photosynthesis
• Quantitative trait locus (QTL)
• Rice (<I>Oryza sativa</I> L.)

詳細情報

• CRID: 1390282679443041408
• NII論文ID: 130004462426
• DOI: 10.1626/pps.9.271
• ISSN: 13491008
• ISSN: 1343943X
• Web Site: http://www.tandfonline.com/doi/pdf/10.1626/pps.9.271
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
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