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Subject: Genetics and Plant Breeding × Author: Chhavikant × End date: 2017 × Start date: 2017 × Type: Thesis ×
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    ThesisItemOpen Access
    Combining ability and heterosis for seed cotton yield and other traits in American cotton (Gossypium hirsutum L.)
    (CCSHAU, 2017) Chhavikant; 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 Forty American cotton hybrids developed on five female parents (testers) using eight male parents (lines) in line x testers mating design and one standard check (HHH 223).The experimental material was grown at CCS Haryana Agricultural University, Cotton Research Station Sirsa, during Kharif 2016-17 in a randomized block design with three replications. Observations were recorded for nine characters namely, plant height, number of monopods, number of sympods, number of bolls, boll weight, ginning out turn, seed index, lint index 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 H1236 x LH 1960 (69.09 %), H1226 x RS 875(67.97 %), H1300 x P 729-37 (66.03 %), H1098i x P 729-37 (66.02%), H1117 x LH 1960 (64.98 %), H1098i x Mahalaxmi (64.03 %) and H1098i x RS 875 (62.77 %) exhibited heterosis of more than 60 per cent and hence warrant their further testing over locations for commercial utilization. The combining ability analysis revealed that additive variance was more than non- additive variance in the expression of all the traits. Among female parents H1098iwas the best general combiner. 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 LH 1960, P 729-37 and RS 875 among the male and H1098i among female may be used for future breeding programme.