PJB-2024-650
Estimation of Combining Ability and Gene Action for Morphological and Yield-Related Traits in Tomato
Saad Zafar
Abstract
Tomato is the second most consumed vegetable. Its yield is highly affected by sudden climate changes. In this study, good-quality but low-yielding lines (L; seven) and their contrasting testers (T; three) were crossed by following the line × tester mating design. Twenty-one hybrids were evaluated for morphological and yield-related traits. The analysis revealed that these lines contributed more significantly to the variance of genotypes compared to testers, particularly for traits such as total soluble solids and fruit color. The L6, L3, and L4 were identified as good general combiners for yield traits due to their high positive General Combining Ability (GCA) values among the genotypes. High GCA values increase the potential and adaptation of parental lines for developing hybrids. Among the cross combinations, L7 × T2, L4 × T1, L1 × T2, L5 × T3, and L6 × T2 showed high positive specific combining ability (SCA) for yield traits and total soluble solids. L4 × T3 and L3 × T3 had positive SCA values for fruit color and number of fruits/plant. Non-additive gene action was identified for all the traits except fruit color which indicate that genotypes should be tested for hybrid development.
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