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Combining ability studies in oilseed sunflower were undertaken with a set of 5 × 4 line × tester including parents for the characters seed yield, 1000- seed weight, days to flowering, days to physiological maturity, plant height, head diameter, stem diameter, oil content, fatty acid content (oleic, linoleic, palmitic, and stearic acids), protein content, seed length, seed width, and hull percentage. General (GCA) and specific combining abilities (SCA) and heterosis of inbred lines and their hybrids were estimated in a line × tester analysis during the first and second crop production seasons in Menemen, Izmir, Turkey. The variances due to GCA and SCA were highly significant for most of the characters in both environments. The ratio (H/D)1/2 and σ 2  GCA/ σ 2  SCA depicted the preponderance of non-additive type gene action for all the characters except plant height, head diameter, seed length, palmitic acid content, and stearic acid content. However, both types of gene action were observed for seed yield, hull percentage, 1000-seed weight, oil content, and stem diameter at stem curve point. In this study, GCA effects were found to be highly significant for all traits, while SCA effects were non-significant for most of the traits. Based on GCA effects in the first and second crop production seasons, the inbreds 0043  cms , 0046  cms , 0195  cms , 0583  cms , 0704  cms , 0708  Rf , 0845  Rf , 0951  Rf , and 1097  Rf  exhibited desirable GCA effects and were found to be good general combiners for most of the traits. Thus, they can be exploited by further breeding for developing superior genotypes and hybrids in sunflower.

STUDY ON THE DETERMINATION OF COMBINING ABILITIES OF INBRED LINES FOR HYBRID BREEDING USING LINE × TESTER ANALYSIS IN SUNFLOWER (Helianthus annuus L.)