Mapping Quantitative Trait Loci Controlling Low Temperature Germinability in Rice(Oryza sativa L.)
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概要
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Quantitative trait loci(QTLs)controlling low temperature germinability(LTG)in rice were identified using 98 backcross inbred lines(BILs)derived from a cross between a japonica variety Nipponbare and an indica variety Kasalath. Seeds of each BIL were stored at 30℃ in a drying machine for 7 months to exclude the effects of seed dormancy. Then the germination rate at 15℃ for 4 days was scored to represent the LTG. The LTG of Nipponbare and Kasalath was 17 and 61%, respectively, and that of the BILs ranged from 0 to 100%. Five putative QTLs, qLTG-2, qLTG-4-1, qLTG-4-2, qLTG-5 and qLTG-11, were detected on chromosome 2(G1327 : nearest marker locus), 4(two regions, C946 and C513), 5(R830)and chromosome 11(G1465). In the case of qLTG-2, qLTG-4-1 and qLTG-11, Kasalath alleles increased the LTG, while Nipponbare alleles increased it in the case of qLTG-4-2 and qLTG-5. These QTLs explained 40.7% of the total phenotypic variation in the BC_1F_9 lines. Using chromosome segment substitution lines(SLs), the existence of qLTG-4-1 and qLTG-11 was confirmed and the effect of the Kasalath allele on qLTG-11 was more pronounced than that on qLTG-4-1. The effect of the Kasalath allele on qLTG-4-2, which suppressed the germination, was temporary and disappeared after 7 to 8 month's storage, suggesting that the disappearance was due to the breaking of seed dormancy and that qLTG-4-2 might control it. Kasalath allele in the case of qLTG-5 decreased the germination rate when the effect of dormancy was completely removed. Therefore, we concluded that qLTG-5 was involved in LTG but not in seed dormancy.
- 日本育種学会の論文
著者
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Yano Masahiro
National Institute of Agrobiological Resources
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Nagamine Tsukasa
National Agricultural Research Center For Wesern Region
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Nagamine Tsukasa
National Institute Of Agrobiological Sciences
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Lin S
Institute Of The Society For Techno-innovation Of Agriculture Forestry And Fisheries:(present Addres
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Yano Masahiro
National Inst. Agrobiological Sci. Ibaraki Jpn
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Miura K
National Institute Of Agrobiological Sciences
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Miura Kiyoyuki
National Agricultural Research Center
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Lin Shao
Institute of the Society for Techno-innovation of Agriculture, Forestry and Fisheries
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Lin Shao
Institute Of The Society For Techno-innovation Of Agriculture Forestry And Fisheries:(present Addres
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