| Summary: | In the present investigation, gene action was investigated for six yield contributing traits in Soybean. Six crosses were made between three Kunitz trypsin inhibitor expressing and two Kunitz trypsin inhibitor-free soybean parents during summer 2017. Dominant gene action was found predominant in the inheritance of yield and yield contributing characters like yield per plant and 100 seed weight in cross P. Sangam × NRC 101 and P. Sangam × NRC 102. Both additive and dominance gene effects were significantly involved in the expression of yield per plant in crosses P. Kimya × NRC 101 and P. Kimya × NRC 102 with duplicate epitasis. Biparental mating design is suggested to improve these characters. Complementary epistasis was observed in cross P. Agrani × NRC 101 for days to 50% flowering, plant height and yield per plant and in cross P. Kimya × NRC 101 for plant height, 100 seed weight and pods per plant thereby suggesting that, the selection can be practiced in F3 generation onwards for the improvement of these characters. Trypsin inhibitor-free genotype showed additive gene action.
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