DNA Research Advance Access originally published online on June 16, 2009
DNA Research 2009 16(4):213-225; doi:10.1093/dnares/dsp010
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High-density Integrated Linkage Map Based on SSR Markers in Soybean

1 National Agricultural Research Center for Hokkaido Region, 1 Hitsujigaoka, Toyohira, Sapporo, Hokkaido 062-8555, Japan
2 Graduate School of Agriculture, Hokkaido University, Kita 9 Nishi 9, Kita, Sapporo, Hokkaido 060-8589, Japan
3 National Agricultural Research Center for Kyushu Okinawa Region, 2421 Suya, Koshi, Kumamoto 861-1192, Japan
4 National Agricultural Research Center for Tohoku Region, 297 Uenodai, Kariwano, Daisen, Akita 019-2112, Japan
5 Kazusa DNA Research Institute, 2-6-7 Kazusa-kamatari, Kisarazu, Chiba 292-0818, Japan
6 Institute of Society for Techno-Innovation of Agriculture, Forestry, and Fisheries, 446-1 Kamiyokoba, Tsukuba, Ibaraki 305-0854, Japan
7 Faculty of Horticulture, Chiba University, 648 Matsudo, Chiba 271-8510, Japan
8 National Institute of Agrobiological Sciences, 2-1-2 Kannondai, Tsukuba, Ibaraki 305-8602, Japan
Received 2 April 2009 ; accepted 25 May 2009.
A well-saturated molecular linkage map is a prerequisite for modern plant breeding. Several genetic maps have been developed for soybean with various types of molecular markers. Simple sequence repeats (SSRs) are single-locus markers with high allelic variation and are widely applicable to different genotypes. We have now mapped 1810 SSR or sequence-tagged site markers in one or more of three recombinant inbred populations of soybean (the US cultivar Jack x the Japanese cultivar Fukuyutaka, the Chinese cultivar Peking x the Japanese cultivar Akita, and the Japanese cultivar Misuzudaizu x the Chinese breeding line Moshidou Gong 503) and have aligned these markers with the 20 consensus linkage groups (LGs). The total length of the integrated linkage map was 2442.9 cM, and the average number of molecular markers was 90.5 (range of 70–114) for the 20 LGs. We examined allelic diversity for 1238 of the SSR markers among 23 soybean cultivars or lines and a wild accession. The number of alleles per locus ranged from 2 to 7, with an average of 2.8. Our high-density linkage map should facilitate ongoing and future genomic research such as analysis of quantitative trait loci and positional cloning in addition to marker-assisted selection in soybean breeding.
Key words: EST-derived SSR marker; integrated linkage map; microsatellite marker; polymorphism information content
* To whom correspondence should be addressed. Tel. +81-11-857-9312. Fax. +81-11-859-2178. E-mail: ishimoto{at}affrc.go.jp
Present address: National Agricultural Research Center for Western Region, 1-3-1 Senyuu, Zentsuuji, Kagawa 765-8508, Japan