| Summary: | The basic information on gene action and inheritance of quantitative traits, which is necessary to develop future breeding
programme, is not widely studied in pigeonpea because it is a long duration crop and widely affected by stresses (biotic &
abiotic). Therefore, present study was conducted among six generations in five pigeonpea crosses to know significance of
additive-dominance model, gene action involved in inheritance of quantitative traits. These six population (P1, P2, F1, F2,
BC1 and BC2) of five cross combinations of pigeonpea were studied during Kharif, 2014-15 for plant height, number of
primary and secondary branches, pods plant-1, pod length, seeds pod-1, 100-seed weight and Seed yield plant-1.Significant
deviation of scale(s) (A, B, C & D) from zero in all the crosses for most of the traits were evidence of presence of epistasis
and hence further subjected to six parameter model to estimate the main gene effects (additive [ ] and dominance [hˆ] ) and
their digenic interactions (additive × additive [iˆ] , additive × dominance [ ˆj] and dominance × dominance [lˆ] ). The
estimates of six parameter model revealed that both additive and dominant gene effects were important in all the crosses for
almost all the traits. However, the relative contribution of dominant gene effects was much higher than additive gene effects
for plant height, pods plant-1, seed pod-1 and seed yield plant-1. Higher frequency of duplicate type of epistasis also confirms
the prevalence of dominance gene effects for above traits except for seed yieldplant-1.
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