Author(s):

S Vennila

Abstract: The success of any plant breeding programme depends to a greater extend on the nature of genetic architecture of the population handled by the breeder. In the present study, four cross combinations were chosen for generation mean analysis as they possessed high grain yield and component traits along with earliness and short stature. Four cross combinations (IR 55408-01 x IR 50, IR 55408-01 x CO 43, IR 42 x IR 50 and IR 42 x CO 43), five generations <em>viz.,</em> P₁, P₂, F₁, F₂ and F₃ were raised in RBD and gene action for various traits was studied. The scaling test revealed that simple additive-dominanace model was inadequate, since any one or both the scales were significant in all the crosses for all the traits showing the existence of digenic epistatic interaction effects. Based on this, the crosses subjected to the analysis of digenic interaction model with estimates of five parameters namely, m, d, h, i and l. the results revealed that additive, dominance and two types of interactions i.e., additive x additive and dominance x dominance effects along with the complementary and duplicate interactions were found to govern yield and all its component traits.

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