Aims: The study aims to identify the best general and specific combiners for seed yield and associated traits, and to determine the nature of gene action governing these traits in linseed (Linum usitatissimum L.) through a Line × Tester analysis.
Study Design: Line × Tester mating design.
Place and Duration of Study: Oilseeds Research Station, Latur, under Vasantrao Naik Marathwada Krishi Vidyapeeth (VNMKV), Parbhani, Maharashtra, India, during the 2025–26 rabi season.
Methodology: Forty-two F₁ hybrids developed using seven lines and six testers, together with their parents and a standard check, were evaluated for ten quantitative traits. Combining ability analysis was performed to estimate general combining ability (GCA), specific combining ability (SCA), and the nature of gene action.
Results: Analysis of variance revealed highly significant differences among the experimental genotypes for all ten traits, indicating substantial genetic variability. Significant variation due to lines, testers, and line × tester interactions suggested the involvement of both additive and non-additive gene effects. RLC-206 and NL-421 were identified as good general combiners, whereas SLS-145 was the best general combiner among the testers for seed yield. The crosses RLC-148 × RLC-198, RLC-206 × RLC-213, and RL-18123 × SLS-156 exhibited significant positive SCA effects for seed yield per plant. For all traits, SCA variance exceeded GCA variance, indicating the predominance of non-additive gene action.
Conclusion: The superior parents and cross combinations identified in the present investigation represent valuable genetic resources for developing high-yielding linseed cultivars. The predominance of non-additive gene action for all the traits studied suggests that breeding approaches such as heterosis breeding, recurrent selection, or biparental mating followed by selection may be effective for improving seed yield and its component traits in linseed.
P. Kshirsagar, S. Pole, M. V. Dhuppe et al.· Plant cell biotechnology and...· 0 citations
Aims: To evaluate combining ability, determine the nature of gene action governing yield and yield-contributing traits, and identify superior parents and promising hybrid combinations in sunflower (Helianthus annuus L.).
Study Design: Line × tester mating design.
Place and Duration of Study: Oilseeds Research Station, Latur, Maharashtra, India, during kharif 2025 (hybrid development) and rabi 2025–26 (field evaluation).
Methodology: Six cytoplasmic male-sterile (CMS) lines and seven restorer lines were crossed in a line × tester mating design to generate 42 hybrids. The resulting hybrids, together with their 13 parents and three standard checks, were evaluated in a randomised block design with two replications for ten agro-morphological and quality traits. The data were subjected to analysis of variance, line × tester analysis to estimate general and specific combining ability, and assessment of gene action following Kempthorne (1957).
Results: Significant variation was observed among the 58 genotypes for all ten traits studied, indicating sufficient genetic variability for effective selection and hybrid development. Combining ability analysis revealed significant GCA and SCA effects for most traits, with SCA variance exceeding GCA variance and indicating the predominance of non-additive gene action. CMS-249A and CMS-47A exhibited desirable GCA effects for several yield-related traits, whereas EC-601924 and EC-601751 were superior restorers. The hybrid combinations DSP-11A × EC-601924, CMS-249A × RHAGPR-3, and CMS-10A × EC-601751 expressed high SCA effects together with desirable performance for yield and related traits, indicating their suitability for hybrid breeding.
Conclusion: Both additive and non-additive genetic effects contributed to the inheritance of yield and yield-contributing traits, although non-additive gene action was predominant. The identified superior parents and hybrids may be utilised in sunflower hybrid-breeding programmes to develop high-yielding hybrids.
Sharanabasava Sangamesh Ambakkanavar, M. V. Dhuppe, R. Chinmay et al.· Plant cell biotechnology and...· 0 citations
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