Cotton Genomics and Genetics 2024, Vol.15, No.2, 93-102 http://cropscipublisher.com/index.php/cgg 97 introgression lines (ILs) developed from interspecific crossing between Upland cotton and G. barbadense, highlighting the high heterotic vigor and improved yield and fiber quality in hybrids (Zhang et al., 2016). These findings underscore the potential of interspecific introgression in enhancing the genetic base and agronomic performance of cotton cultivars. Figure 2 Population differentiation, introgression and selection (Adopted from Nie et al., 2020) Image caption: (a) The population differentiation with and without introgression events among Gh, Gb and Gh-race groups; (b) Genetic introgressions in genome-wide scale. Gb-INT, introgression event from Gh to Gb; Gh-INT, introgression event from Gb to Gh; (c) Selective sweeps and co-selected loci in Gh and Gb panels (Adopted from Nie et al., 2020) 4.3 Hybridization events and their impact Hybridization events between Gossypium species have had profound impacts on their genetic makeup and adaptation. Molecular evidence suggests that hybridization and introgression have been crucial in maintaining species integrity and cohesion in naturally isolated populations, such as those of inselberg bromeliads (Mota et al., 2018). In the context of Gossypium, hybridization has facilitated the transfer of adaptive alleles, contributing to
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