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Evaluation of single cross multiple cross and modified back cross methods based on recombination and character association in upland cotton


Indian Journal of Agricultural Sciences 57(5): 318-321
Evaluation of single cross multiple cross and modified back cross methods based on recombination and character association in upland cotton
Of the single-cross, multiple-cross and modified back-cross methods used for increasing the desirable recombinations and character associations in 6 varieties, viz. 'G. Cot. 10', 'MCU 5', 'Buri 1007', 'Acala 4-42', 'AC 738' and 'Bhagya Laxmi', of upland cotton (Gossypium hirsutum Linn.), multiple-cross method proved to be efficient in producing proportion (13.3%) of strains which showed recombinations for yield, ginning outturn and halo length. The multiple-cross method was also effective in weakening negative correlation between yield and fibre strength, whereas single-cross and modified back-cross methods were useful in breaking linkages between yield and fibre length. Modified back-cross method succeeded in breaking close and negative association between ginning outturn and fibre characters, viz. fibre length and fibre strength. For creating a higher proportion of strains with desirable characters, multiple-crossing method would be ideal, while for effective breaking of character associations modified back-cross method would be more useful.


Accession: 005401551



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