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Subject: Plant Breeding × Author: Giri, Ravinder Kumar × End date: 2006 × Start date: 2005 ×
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    ThesisItemOpen Access
    Studies on combining ability and standard heterosis in upland cotton (Gossypium hirsutum L.)
    (CCSHAU, 2005) Giri, Ravinder Kumar; Nirania, K.S.
    The present study was undertaken to estimate standard heterosis with the objectives of exploring possibilities of its commercial utilization and study of combining ability effects. The material for the present investigation comprised of 48 hybrids developed on 3 female parents (testers) using 16 male parents (lines) in a line x tester mating design along with their 19 parents (3 females and 16 males) and one standard check (HHH-223). The experimental material was grown at Cotton Research Station Sirsa, during Kharif 2004 in a randomized block design with three replications. Observations were recorded for 11 characters namely, plant height, days to 50% flowering, number of monopods, number of sympods, number ofbolls per plant, boll weight, seed index, ginning out turn, lint index, halo length and seed cotton yield per plant. The economic heterosis was calculated over standard check HHH-223. Considerable amount of heterosis were recorded for seed cotton yield and other related characters under study. The hybrids HS 6 x G cot 12 and HS 6 x Gumbo delta type exhibited heterosis of more than 50 per cent and hence warrant their further testing over locations for commercial utilization. The combining ability analyses revealed that both additive and non-additive variance were present in the expression of all the characters with former playing the major role for majority of the characters. Among female parents HS 6 was the best general combiner. In general, none of the male or female parent was found to possess high gca effects for all the characters under study. However, considering the economic importance of various characters LAS 5Red AK, RS 875, SK 663 and Gumbo delta type among the males and HS 6 among the females may be used for future breeding programs.