Studies on Target Genotype Based on Different Selfed and Backcross Derived Generations in Cotton (Gossypium hirsutum L.)
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Date
2016-06
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University of Agricultural Science, Dharwad
Abstract
Concept of target genotype addresses distribution of favourable alleles between parents and present study aimed at determining target genotype, extent of heterosis and type of gene action involving nine generations (P1, P2, F1, F2, B1, B2, F3, B1F2, B2F2) in two crosses (DSMR10 x DRCR4 and DRGR2572 x M5) for yield and other quantitative traits in Gossypium hirsutum during kharif 2015.
Target genotype concept was applied to determine the distribution of desirable alleles of a quantitative character between the two parents by comparing B1, F2 and B2. In cross DSMR10 X DRCR4, B1 population while in cross DRGR2572 X M5, B2 population revealed higher seed cotton yield followed by F2 and B2. In cross DSMR10 X DRCR4, B1 population was most productive. Superior of a backcross population over F2 indicates that distribution of desirable alleles between parents is not equal. The results clearly indicate that practicing selection for yield should be in B1 derived segregating generations of DSMR10 X DRCR4 and in B2 derived segregating generations of DRGR2572 X M5. Similar trend of inference on target genotype was observed for number of boll, boll weight, lint index, ginning outturn in cross DSMR10 X DRCR4. In cross DRGR2572 X M5, yield related traits like number of bolls, lint index, number of reproductive points showed similar trend of performance.
Heterosis in F1 and inbreeding depression in F2 were significant in both the crosses for most of the characters. Generation mean analysis was done by deducing six equations based on nine generations and the six genetic effects m, d, h, i, j and l were significant for most of the traits. Duplicate epistasis was observed for almost all the characters studied in both the crosses.
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