Cotton Genomics and Genetics 2024, Vol.15, No.2, 81-92 http://cropscipublisher.com/index.php/cgg 86 hirsutumto Gossypium barbadense underscores the role of hybridization in shaping the genetic landscape of the genus (Wang et al., 2022). Figure 2 Geographic distribution and population analysis of the A1 andA2 accessions (Adopted from Huang et al., 2020) Image caption: (a): Geographic distribution of the collected A1 and A2 genomes. Green dots represent the collection sites of A1 genomes, red dots represent A2 genomes collected in China, and yellow dots represent A2 genomes collected outside of China. (b): Principal component analysis (PCA) based on whole-genome SNPs, showing the first three principal components of the A1 andA2 genomes. The green, red, and yellow dots are consistent with the colors in Figure 2a. PCA analysis shows that despite their geographic origins, these cotton genomes are divided into two independent groups, namely the A1 group and the A2 group. This indicates a significant genetic distinction between the A1 andA2 genomes. (c): Genetic relationships between all A1 andA2 genomes.
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