Mapping of quantitative trait loci controlling seed longevity of rice (Oryza sativa L.) after various periods of seed storage |
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Authors: | K. Sasaki Y. Fukuta T. Sato |
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Affiliation: | Graduate School of Life Sciences, Tohoku University, Katahira, Aoba-ku, Sendai 980-8577, Japan;Plant Breeding, Genetics and Biochemistry, International Rice Research Institute, DAPO Box 7777, Metro Manila, Philippines |
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Abstract: | Seed longevity varies considerably in cultivated rice (Oryza sativa L.), but the underlying genetic mechanism of longevity has not been well elucidated. Quantitative trait loci (QTL) that control seed longevity after various periods of seed storage were sought using recombinant inbred lines derived from a combination involving ‘Milyang23’(Indica‐type) and ‘Akihikari’ (Japonica‐type). In all, 12 QTLs for germination and normal seedling growth were detected as indices of seed longevity on chromosome 7 (one region) and chromosome 9 (two regions) in treated seeds that had been stored under laboratory conditions for 1, 2 or 3 years.‘Milyang23’ alleles of all QTLs promoted germination and normal seedling growth after all durations of storage. These QTL regions were detected repeatedly in more than one seed condition. Therefore, we infer that these regions control seed longevity. |
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Keywords: | Oryza sativa aging germination quantitative trait loci seed longevity |
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