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20111
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Subject: Plant Breeding × End date: 2011 × Start date: 2010 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Studies on combining ability and economic heterosis in upland cotton (Gossypium hirsutum L.)
    (CCSHAU, 2011) Manish Kumar; Nirania, K.S.
    The present study was undertaken to estimate economic heterosis with the objective of exploring possibilities of its commercial utilization and to study the combining ability effects. The material for the present investigation comprised of 70 upland cotton genotype viz., 52 hybrids developed on 4 female parents (testers) using 13 male parents (lines) in line x testers mating design along with their 17 parents (4 females and 13 males) and one standard check (Hybrid HHH-223).The experimental material was grown at CCS Haryana Agricultural University, Cotton Research Station Sirsa, during Kharif 2010 in a randomized block design with three replications. Observations were recorded for nine characters namely, plant height, days to first flower, number of monopods, number of bolls, boll weight, ginning out turn, seed index, lint index and seed cotton yield per plant. The economic heterosis for all these characters 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 H1226 x HS-1 and H1098 x DELTA SL exhibited heterosis of more than 65 per cent and hence warrant their further testing over locations for commercial utilization. The combining ability analysis revealed that both additive and non additive variances were present in the expression of all the characters with former playing major role for majority of the characters. In general, none of the male and female parents was found to posses high gca effects for all the characters under study. However, considering the economic importance of various characters DELCOT-517, F-1378, AUBURN NE-165, REX-66 and RS-875 among the males and H1226 among females may be used for future breeding programmes.