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Line x Tester Analysis in American cotton (Gossypium hirsutum L.)

KrishiKosh

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Title Line x Tester Analysis in American cotton (Gossypium hirsutum L.)
 
Creator Nakum, Jitesh S.
 
Contributor VADODARIYA, K.V.
 
Subject participation, diseases, livestock, biological phenomena, sets, animal products, byproducts, horticulture, fruits, breeds (animals)
 
Description Line x tester analysis using four lines as female and eight testers as male was carried out with a view to estimate heterosis, combining ability and nature of gene action in upland hybrid cotton. The experimental material comprised of twelve parents and their thirty two crosses and two standard checks (G.Cot.Hy-8 and G.Cot.Hy-12). A complete set of fourty six genotypes were planted in randomized block design replicated thrice at the Regional Cotton Research Station, N.A.U, Bharuch during Kharif-2011-12.
The analysis of variance revealed significant differences among parents for all the characters studied, except for days to 50% flowering, days to 50% boll bursting, seed cotton yield per plant, ginning percentage and fibre maturity ratio. The mean squares due to hybrids were also found highly significant for all the characters except days to 50% flowering, days to 50% boll bursting, ginning percentage and fibre maturity ratio, indicated presence of considerable amount of genetic variability in the
material tested. Significant and positive standard heterosis was observed for majority of the yield attributing characters. High expression of heterosis for seed cotton yield per plant was associated with high heterotic effects for at least one yield attributing component. Combining ability analysis revealed that the magnitude of SCA variances was higher than GCA variances suggested the preponderance of non- additive gene effects for all the characters studied, except maturity ratio. Among parents, G.Cot.16, H 1452 and NDIH 1938 observed good general combiners for seed cotton yield and its contributing traits. The crosses viz., GBHV 148 x H 1452, GBHV 164 x NDIH 1938 and G. Cot.16 x H 1353 appeared promising as they registered high per se performance with significant heterobeltiosis as well as standard heterosis with positive sca effects for seed cotton yield per plant, which indicated that these crosses could be exploited for commercial cultivation in respect of upland cotton.
 
Date 2017-01-20T10:46:40Z
2017-01-20T10:46:40Z
2013-09
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/97261
 
Language en
 
Format application/pdf
 
Publisher GENETICS AND PLANT BREEDING DEPT., N.M. COLLEGE OF AGRICULTURE, NAVSARI AGRICULTURAL UNIVERSITY, NAVSARI