Fig. 2 Population structure, phylogeny, principal component analysis and linkage disequilibrium decay analysis of 300 upland cotton materials A: Optimal number of subgroups by cross-validation; B: Phylogenetic tree; C: Population structure analysis with K = 6; D: PCA analysis; E: Linkage disequilibrium decay.
Fig. 4 Analysis of the LP-related QTL qLP-Gh5.18 on chromosome A05 A: Manhattan plot of association mapping of LP based on BLUP value in GLM (Q) model. Chromosomes 1 to 13 represent chromosomes A01 to A13, and 14 to 26 represent chromosomes D01 to D13. B: Localized Manhattan plot around the peak region on chromosome A05, with red arrows indicating snp497745. C: Boxplot of LP based on the snp497745 genotype. Significance analysis was performed; **** represent significance at the 0.000 1 probability level. D: LD heat map of SNP in the 108.85-109.11 Mb interval.
Fig. 5 Analysis of the LP-related QTL qLP-Gh12.43 on chromosome A12 A: Manhattan plot of association mapping of LP based on E5 in GLM (P) model. B: Localized Manhattan plot around the peak region on chromosome A12, with red arrows indicating snp1691332 in qLP-Gh12.43. C: Boxplot of LP based on the snp1691332 genotype; **** represent significance at the 0.000 1 probability level. D: LD heat map of SNP in the 106.57-106.82 Mb interval.
Fig. 7 Analysis of the BW-related QTL qBW-Gh7.5 on chromosome A07 A: Manhattan plot of association mapping of BW based on BLUP value in GLM (P) model. B: Localized Manhattan plot around the peak region on chromosome A07, with red arrows indicating snp852852 in qBW-Gh7.5. C: Boxplot of BW based on the snp852852 genotype; ** represents significant difference at the 0.01 probability level. D: LD heat map of SNP in the 90.83 - 91.18 Mb interval.
Fig. 8 Analysis of the BW-related QTL qBW-Gh19.5 on chromosome D06 A: Manhattan plot of association mapping of BW in E5 and GLM (Q) model. B: Localized Manhattan plot around the peak region on chromosome D06, with red arrows indicating snp2428027 in qBW-Gh19.5. C: Boxplot of BW based on the snp24280272 genotype; * represents significant difference at the 0.01 probability level. D: LD heat map of SNP in the 64.22 - 64.56 Mb interval.