Diallel analysis of growth trait inheritance in mulberry (Morus sp.)

Aim: To assess the combining abilities of four mulberry genotypes to identify genetic variations that can enhance growth traits and improve hybridization outcomes. Ultimately, the study aims to optimize parental selection for better production in mulberry and bringing advancements in mulberry breeding. Methodology: Griffing approach of full diallel mating design (Model 1 and Method 1) was used where parents, F1 hybrids and F1 hybrids reciprocals were included. Results: V1 and MR2 excelled in general combining ability (GCA) for growth traits. Positive specific combining effects (SCA) were observed in V1×G4 and G4×V1 crosses. Higher specific combing ability variance and significant reciprocal combing ability (RCA) indicate strong non-additive gene action and maternal inheritance. Interpretation: The study highlights V1 and MR2 as superior combiners with high positive GCA, emphasizing the importance of parent interactions. Non-additive gene action, indicated by higher SCA variance, suggests focusing on these interactions for breeding. The crosses V1×G4 and G4×V1 showed strong SCA effects, offering promise for improving growth and mulberry productivity in sericulture. Key words: Additive gene effect analysis, Diallel, Growth traits, Mulberry genotypes, Non- additive gene effect