Additional file 6.

Pedigree diagram for Japanese rice cultivars that are ancestors or descendants of Koshihikari. Numbers in parentheses are the serial numbers designated in additional file 3. Black, shaded, and white backgrounds represent the following varietal groups, respectively: Group 1 (landraces developed before 1921), Group 2 (cultivars developed from 1931 to 1974), and Group 3 (cultivars developed from 1975 to 2005). This classification is based on the categorization of R. Yamamoto [55].

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Yamamoto et al. BMC Genomics 2010 11:267   doi:10.1186/1471-2164-11-267