Identification and Genetic Mapping of Potential QTLs Conferring Heat Tolerance in Cotton (Gossypium hirsutum L.) by Using Micro Satellite Marker’s Approach

High-temperature stress can cause serious abiotic damage that limits the yield and quality of cotton plants. Heat Tolerance (HT) during different developmental stages guarantee a high under heat stress. HT is complex trait regulated by multiple quantitative loci (QTLs). In this study, F2 population derived from cross between MNH-886, heat-tolerant cultivar, MNH-814, heat-sensitive variety, was used to map QTLs morphological in cotton. A genetic covering 4402.7 cm, with 175 marker 26 linkage groups, constructed using (94 individuals). This evaluated for 23 morpho-physiological contributing traits QTL analysis via composite interval mapping detected 17 QTLs: three each Total Number Sympodes (TNS), Length Bract (LOB), Staminal-column (LOS); two First Sympodial Node Height (FSH), one (SNH), Percent Boll set on second position along Sympodia (PBS), Nodes (TNN), Bolls (NOB), Buds (TNB), Petal (LOP). Individually, accounted 7.76%–36.62% phenotypic variation. identified linked tolerance facilitate marker-assisted breeding