QTL [Quantitative trait loci] identification for within-boll yield components of Gossypium hirsutum L.
2017
Muhammad Naeem | Muhammad Iqbal | Sami-Ul-Allah | Wajid, N. | Waqas, Z.
Cotton is regarded as the organic gold of the world owing to its fiber. Increasing the yield of cotton varieties remains as the principal objective of cotton breeders. None other than within-boll yield traits may have a direct influence on the yield of cotton crop. The present study aimed to identify the quantitative trait loci (QTL) controlling these vital traits so as to speed up the cotton improvement program in Pakistan. From a total of 2365 simple sequence repeat (SSR) primers, 137 polymorphic primer pairs were found to be encompassing a distance of 2341 cM. A linkage map consisted of 121 loci with an average of distance of 4.7 cM between two adjacent markers .Based on the phenotypic data on the seven traits, 14 QTLs were identified in this study on all of the chromosomes for seed cotton yield per locule, seeds per locule, seeds per boll, locule per boll, seed cotton yield per boll, lint per seed and seed volume in F sub 2 population depicting a phenotypic variation from 0.69% to 14.71%. It is concluded that this study may prove to be a milestone in the cotton breeding program after confirmation of linked markers. Utilization of identified QTLs with the help of molecular markers in marker-assisted cotton breeding may enhance the yield potential of developing cotton varieties by unraveling the genetic mechanism of these traits.
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