*3.5. QTLs Mapping for Traits Associated with Heat Tolerance in Cotton*

A summary of statistically important QTLs is shown in Table 6. All QTLs for First Sympodial node height, Sympodial node height, percent boll set along sympodia at 2nd position along sympodia, Total number of Sympodes, Total no. of nodes, number of bolls, Total no of buds, Length of bract, Length of Staminal column, and and Length of petal are shown in Figure 3. A total of 17 regions were recognized that contain the QTLs with LOD value 3.0 and above. The most noteworthy QTLs are described in Table 6.

**Table 6.** QTLs related to heat tolerance in Intraspecific cross among MNH-886 and MNH-814. (LOD = Logarithm of odds, Additive = Additional effects, Dominance/additive = ratio between dominance and additive effects, PV% = Phenotypic variance).



**Table 6.** *Cont.*

#### 3.5.1. QTLs for First Sympodial Node Height (FSH)

Two QTLs, *qFSHa1* and *qFSHa2*, for first sympodial node height were detected on chromosome 15 with LOD ≥ 6.0, which explain 35% and 36% of phenotypic variance in F2 respectively. These Loci detected 35%–36% of the PV value. When two QTLs were assembled together, they explained 71% of the PV value. The additive values for both QTLs were 0.59 and 0.58 respectively (Table 6). Position of the QTLs on the linkage map is shown in Figure 4.
