Field experiment was conducted during 2005 to 2008 at Indian Agricultural Research Institute (IARI), New Delhi to study genetics of fibre strength in Gossypium hirsutum L cotton. Genotypes ‘P 56-4’ and ‘RS 2013’ were used to develop 6 generations. Additive × dominance epistasis was found significant. The F2 of this contrasting cross showed wide range of variation from 18.1 to 33.1 g/tex for fibre strength. Distribution of F2population also indicated transgressive segregation for fibre strength. This F2 population was also used to identify quantitative trait loci (QTLs) linked to fibre strength using Amplified fragment length polymorphism and single sequence repeats (SSR) markers. Linkage map was constructed covering a total of 932.9 cM. The average distance between adjacent markers was 10.11 cM. Six QTLs designated as QTFS-2A.1 to QTFS-2A.6 were detected which explained 9.24 to 36.03% of the phenotypic variation.
Key words: Gossypium hirsutum, generation mean, fibre strength, quantitative trait loci (QTLs), amplified fragment length polymorphism (AFLP), single sequence repeats (SSR).
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