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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.)
 
Creator K.J.Yashwantha Kumar
 
Contributor Rajesh S.Patil
 
Subject Genetics and Plant Breeding
 
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.
 
Date 2016-10-27T15:37:24Z
2016-10-27T15:37:24Z
2008
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/82579
 
Format application/pdf
 
Publisher UAS, Dharwad