Heterosis and combining ability analysis for yield and fiber quality traits in American cotton (Gossypium hirsutum L.)

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dc.contributor.advisorSomveer
dc.contributor.authorChakholoma, Maggie
dc.date.accessioned2022-08-20T06:48:58Z
dc.date.available2022-08-20T06:48:58Z
dc.date.issued2020-01
dc.description.abstractThe present study was carried out during Kharif season of 2018. The experimental material comprised of 12 lines viz., H 1471, H 1472, H 1480, H 1488, H 1489, H 1508, H 1518, H 1519, H 1520, H 1522, H 1523, H 1098i and 4 testers viz., C 201, C 202, C 210, C 211 and 48 crosses generated by crossing 12 lines with 4 testers in Line x tester design and one standard check hybrid HHH 223. The objective of the study was to determine heterosis of hybrids, combining ability and variances for different traits and identify the best combiners with respect to seed cotton yield and fibre quality. Observations were recorded for 14 characters namely, days to 1st flower, plant height (cm), number of monopods/ number of sympods per plant, number of bolls/plant, bolls weight (g), seed index (g), ginning out turn (%),) lint index, seed cotton yield per plant (g), uniformity index, fibre strength, upper half mean length and micronaire value. Ten crosses recorded a magnitude of heterosis for seed cotton yield per plant of above 40 percent. The highest economic heterosis for seed cotton yield was observed by the cross H 1489 x C 210 which also exhibited highest per se performance and significant sca effects for important characters; number of bolls per plant and boll weight. The variance gca/sca ratio depicted predominance of non-additive gene action for days to first flowering, number of bolls per plant, boll weight, seed index, seed cotton yield per plant, fibre strength, uniformity ratio, upper half mean length and micronaire value. The characters lint index, and number of monopods per plant revealed non- additive and additive gene action while plant height, number of sympods per plant and GOT were pre dominantly controlled by additive gene action. The lines H 1471, H 1472 H 1480 and H 1518 and the tester C-201 were found to be the best combiners and be considered for future breeding programme. The cross combination H 1480 × C 201 recorded highest significant SCA effects for seed cotton yield per plant and also exhibited significant economic heterosis for important characters. H 1098i × C 211 recorded significant SCA effects and economic heterosis for seed cotton yield. Hence, should be considered for further testing over location and environments.en_US
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810186489
dc.keywordsHeterosis,Combining ability, American cotton, Line x testeren_US
dc.language.isoEnglishen_US
dc.pages49 + iven_US
dc.publisherCCSHAU, Hisaren_US
dc.subGenetics and Plant Breedingen_US
dc.themeHeterosis and combining ability analysis for yield and fibre quality traits in American cotton (Gossypium hirsutum L.)en_US
dc.these.typeM.Scen_US
dc.titleHeterosis and combining ability analysis for yield and fiber quality traits in American cotton (Gossypium hirsutum L.)en_US
dc.typeThesisen_US
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