Combining ability and heterosis studies in experimental hybrids of cotton (Gossypium hirsutum L.)
KrishiKosh
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Title |
Combining ability and heterosis studies in experimental hybrids of cotton (Gossypium hirsutum L.)
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Creator |
K.J.Yashwantha Kumar
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Contributor |
Rajesh S.Patil
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Subject |
Genetics and Plant Breeding
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Description |
The present study was carried out at the Agricultural Research Station, Dharwad during kharif 2007-08. The experimental material comprised of 10 lines viz., P72-9-37, H-1- 87,LH-2076, CPD-814, RHC-2022, ADL-903, CCH-1831, TCH-1705, L-766, 3 testers viz., RAH-221, RACH-11, RCR-4 and 30 crosses generated by crossing the 10 lines with 3 testers in line x tester design. The ratio of GCA variance to SCA variance revealed predominance of non-additive gene action for all the characters. These traits can be improved through breeding methods involving selection, intermating selects and reselection besides heterosis breeding. The studies on general combining ability of parents revealed that the tester RAH-221 was a good general combiner for seed cotton yield, number of bolls per plant, boll weight, plant height, number of seeds per boll, ginning out turn, lint index and micronaire. Among the lines, P72-9-37 was a good general combiner for number of seeds per boll, seed index, lint index and fibre strength. The line CCH-1831 was good general combiner for seed cotton yield, seed index and fibre strength. The cross LH-2076 x RACH-11 exhibited significant heterosis over mid-parent, better parent and standard checks for seed cotton yield. The genotypic correlations revealed that number of bolls per plant, boll weight, number of sympodia, sympodial length at 50 per cent plant height and fibre strength showed significant correlation with seed cotton yield. The path analysis indicated that ginning out turn had highest direct effect on seed cotton yield. The present study identified LH-2076 x RACH-11 and ADL-903 x RAH-221 as promising hybrids combining high seed cotton yield with high seed oil yield. They were on par for fibre properties with the checks. These hybrids can be considered for commercial cultivation after thorough testing across environments. They can also be used to derive superior segregants in further generations. |
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Date |
2016-10-27T15:37:24Z
2016-10-27T15:37:24Z 2008 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/82579
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Format |
application/pdf
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Publisher |
UAS, Dharwad
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