Mapping Quantitative Trait Loci Controlling Cool-temperature Tolerance at Booting Stage in Temperate Japonica Rice.

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  • Takeuchi Yoshinobu
    Institute of the Society for Techno-innovation of Agriculture, Forestry and Fisheries
  • Hayasaka Hiroshi
    Miyagi Prefecture Furukawa Agricultural Experiment Station
  • Chiba Bunya
    Miyagi Prefecture Furukawa Agricultural Experiment Station
  • Tanaka Isao
    Fukui Prefecture Agricultural Experiment Station
  • Shimano Tomotoshi
    Institute of the Society for Techno-innovation of Agriculture, Forestry and Fisheries
  • Yamagishi Masumi
    Research Institute of Agricultural Resources, Ishikawa Agricultural College Present address: Faculty of Life and Environmental Science, Shimane University
  • Nagano Kuniaki
    Miyagi Prefecture Furukawa Agricultural Experiment Station
  • Sasaki Takuji
    National Institute of Agrobiological Sciences
  • Yano Masahiro
    National Institute of Agrobiological Sciences

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説明

To identify the chromosomal regions controlling cool-temperature tolerance (CT) at booting stage of rice (Oryza sativa L.), we performed quantitative trait locus (QTL) analysis with doubled-haploid lines (DHLs). We constructed a linkage map with 135 restriction fragment length polymorphism (RFLP) markers and 34 random amplified polymorphic DNA (RAPD) markers using 212 DHLs derived from crosses between two cultivars, Akihikari (moderately cool-temperature susceptible) and Koshihikari (cool-temperature tolerant). Both parental cultivars belong to the temperate japonica group. The degree of tolerance of each DHL was measured as the degree of sterility in the field with a running cold-water system. Three QTLs were mapped one each to chromosomes 1, 7, and 11. The QTL with the largest effect, qCT-7, was mapped to chromosome 7 and explained 22.1% of the total phenotypic variation. The other two QTLs, qCT-1 and qCT-11, explained approximately 5% each. For all of the QTLs, alleles from Koshihikari increased the degree of CT. We also mapped QTLs for heading date and culm length, which are thought to affect CT.

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