General Combining Ability Effects of New Inbred Lines and Identification of Best Specific Combiners to Exploit Heterosis for Seed yield and Oil content in Sunflower (Helianthus annuus L.)

Author: M.S. Umar Farooq*, M. S. Uma, S.D. Nehru and C.P. Manjula

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Abstract

Successful selection of genotypes with a high genetic potential for seed yield and oil content requires all the possession of the appropriate genetic variability in the initial material. In order to achieve this, it is necessary to have information on the mode of inheritance and the manifestation of heterotic effect for trait of interest as well as to identify superior genotypes based on combining abilities, with this background an investigation was carried out on 200 sunflower hybrids produced through line x tester mating design using 5 CMS lines and 40 newly developed inbred lines (testers) to generate information on effects due to combining ability in respect of seed yield and oil content in sunflower. Analysis of variance revealed that the mean sum of squares due to the testers was significant for the two traits under study. Estimation of general combining ability (GCA) effects of testers indicated that, the testers viz., F-20, L-3-1 and B-29-2 exhibited significant GCA effects for

Keywords

GCA, Heterosis, line × tester analysis, Oil content, Seed yield and SCA.