A major and stable QTL associated with seed weight in soybean across multiple environments and genetic backgrounds |
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Authors: | Shin Kato Takashi Sayama Kenichiro Fujii Setsuzo Yumoto Yuhi Kono Tae-Young Hwang Akio Kikuchi Yoshitake Takada Yu Tanaka Tatsuhiko Shiraiwa Masao Ishimoto |
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Affiliation: | 1. National Agriculture and Food Research Organization (NARO) Tohoku Region Agricultural Research Center, 297 Uenodai, Kariwano, Daisen, Akita, 019-2112, Japan 2. National Institute of Agrobiological Sciences (NIAS), 2-1-2 Kannondai, Tsukuba, Ibaraki, 305-8602, Japan 4. NARO Hokkaido Region Agricultural Research Center, 1 Hitsujigaoka, Toyohira, Sapporo, Hokkaido, 062-8555, Japan 3. Graduate School of Agriculture, Kyoto University, Oiwake, Kitashirakawa, Sakyo, Kyoto, 606-8502, Japan 5. NARO Kyushu Okinawa Agricultural Research Center, 2421 Suya, Koshi, Kumamoto, 861-1192, Japan 6. National Institute of Animal Science, RDA, Cheonan, 330-801, Republic of Korea 7. NARO Western Region Agricultural Research Center, 1-3-1 Senyu, Zentsuji, Kagawa, 765-8508, Japan
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Abstract: | Key message We detected a QTL for single seed weight in soybean that was stable across multiple environments and genetic backgrounds with the use of two recombinant inbred line populations. Abstract Single seed weight (SSW) in soybean is a key determinant of both seed yield and the quality of soy food products, and it exhibits wide variation. SSW is under genetic control, but the molecular mechanisms of such control remain unclear. We have now investigated quantitative trait loci (QTLs) for SSW in soybean and have identified such a QTL that is stable across multiple environments and genetic backgrounds. Two populations of 225 and 250 recombinant inbred lines were developed from crosses between Japanese and US cultivars of soybean that differ in SSW by a factor of ~2, and these populations were grown in at least three different environments. A whole-genome panel comprising 304 simple sequence repeat (SSR) loci was applied to mapping in each population. We identified 15 significant QTLs for SSW dispersed among 11 chromosomes in the two populations. One QTL located between Sat_284 and Sat_292 on chromosome 17 was detected (3.6 < LOD < 14.1) in both populations grown in all environments. This QTL, tentatively designated qSw17-1, accounted for 9.4–20.9 % of phenotypic variation in SSW, with a dominant allele being associated with increased SSW. Given its substantial effect on SSW, qSw17-1 is an attractive target for positional cloning, and SSR markers closely associated with this locus may prove useful for marker-assisted selection for SSW control in soybean. |
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