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(Genetic Resources Evaluation)
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概要
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Carbon isotope discrimination (Δ) occuring in the process of photosynthesis, shows variation among rice (Oryza saliva 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 ^<13>C 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 CO_2 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.
- 日本作物学会の論文
著者
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SHIRAIWA Tatsuhiko
Graduate School of Agriculture, Kyoto University
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Fukuta Yoshimichi
Plant Breeding Genetics And Biochemistry International Rice Research Institute
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Fukuta Yoshimichi
Plant Breeding Genetics And Biochemistry Division International Rice Research Institute
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Horie Takeshi
Graduate School Of Agriculture Kyoto Univ.
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Sugimoto Atsuko
Graduate School Of Environmental Science Hokkaido University
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Takai Toshiyuki
Graduate School Of Agriculture Kyoto University
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Shiraiwa Tatsuhiko
Graduate School Of Agriculture Kyoto Univ.
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