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Investigation was carried to study the inheritance of seed colour in sunflower (Three crosses for seed colour direct and reciprocal). F1 selfed seeds of six crosses were raised during kharif 2013 season at Main Agricultural Research Station, Raichur (Karnataka). For the seed colour inheritance a set of three crosses were raised in the first cross both direct and reciprocal crosses exhibited a ratio (CMS 17A x 104B) and (CMS104A x 17B) of black seed to the brown seed plants approximated 9:3:3:1 a typical dihybrid segregation in F2 population with different phenotypic expressions indicating the gene interaction effects. In the second set of cross involving direct and reciprocal revealed (DWSNB x 104B) and (CMS 104B x DWSNB) a ratio of dull white seed to the black seed plants approximated 12:3:1 in F2 indicate a masking gene action with different phenotypic expressions showed the gene interaction effects while in the third set of cross (DWSNB x 17B) and (CMS17A x DWSNB) with direct and reciprocal crosses showed a ratio 9:7 a complementary gene action with different phenotypic expressions of dull white seed to brown seed plants indicating the gene interaction effects.
Keywords: Seed colour, Inheritance, Chi-square Test