Genetic study for yield and yield components in crosses between trypsin inhibitor free and expressing soybean [Glycine max (L.) Merrill.] genotypes

Abstract

In the present investigation, gene action was investigated for six yield contributing traits in Soybean. Six crosseswere made between three Kunitz trypsin inhibitor expressing and two Kunitz trypsin inhibitor-free soybean parentsduring summer 2017. Dominant gene action was found predominant in the inheritance of yield and yield contributingcharacters 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 incrosses P. Kimya ×  NRC 101 and P. Kimya ×  NRC 102 with duplicate epitasis. Biparental mating design issuggested to improve these characters. Complementary epistasis was observed in cross P. Agrani × NRC 101for days to 50% flowering, plant height and yield per plant and in cross P. Kimya × NRC 101 for plant height, 100seed weight and pods per plant thereby suggesting that, the selection can be practiced in F3 generation onwardsfor the improvement of these characters. Trypsin inhibitor-free genotype showed additive gene action