Cotton Genomics and Genetics 2024, Vol.15, No.2, 81-92 http://cropscipublisher.com/index.php/cgg 88 constructed, leading to the identification of 13 quantitative trait loci (QTLs) related to fiber quality (Figure 3). These resources will enhance research on cotton evolution and functional genomics, providing a reference for future fiber improvement breeding programs. Figure 3 Identification of favorable chromosome segments controlling fiber quality by using introgression lines (Adopted from Wang et al., 2019) Image caption: (a) A backcross population constructed using Gossypium hirsutum Emian22 (recurrent parent) and Gossypium barbadense 3-79 (donor parent), showing the fiber characteristics of both cotton species and the identified introgression segments across the 26 chromosomes; (b) The introgression segment on chromosome D12 and its fiber characteristics, particularly the segment containing limited fuzz fibers; (c) SNP ratio of Xuzhou142fl, with mapping results from sequencing two different pools in the F2 population; (d) Distribution of quantitative trait loci (QTLs) related to fiber quality on the chromosomes of Gossypium hirsutum, with each QTL indicated by a red box; (e, f) QTL mapping for fiber length and fiber elongation rate, respectively, showing the LOD scores and physical locations of different introgression segments. Figure 3 validates the identification and mapping of 13 important QTLs related to fiber quality through the backcross population, providing a foundation for further cotton improvement breeding programs (Adapted from Wang et al., 2019) Another case study involves the genetic analysis of Gossypium herbaceumand Gossypium arboreum, which has provided insights into their independent domestication and interspecific gene flow, informing breeding strategies for these diploid species (Huang et al., 2020; Grover et al., 2022). These examples demonstrate the practical benefits of integrating taxonomic knowledge into breeding and conservation programs. The taxonomic classification of Gossypium plays a critical role in advancing cotton breeding and conservation efforts. By understanding the genetic diversity and evolutionary history of Gossypium species, researchers and breeders can develop improved cotton varieties and implement effective conservation strategies to ensure the sustainability of this economically important crop.
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