Mapping QTL for fiber- and seed-related traits in Gossypium tomentosum CSSLs with G. hirsutum background

Introducing the inherent genetic diversity of wild species into cultivars has become one of the hot spots in crop genetic breeding and genetic resources research. Fiber- and seed-related traits, which are critical to the global economy and people's livelihoods, occupy the principal status of cotton breeding. Here, a wild cotton species Gossypium tomentosum, was used to broaden the genetic basis of G. hirsutum and identify QTL for fiber- and seed-related traits. A population of 559 chromosome segment substitution lines (CSSLs) was established with various chromosome segments from G. tomentosum in a G. hirsutum cultivar background. A total of 72, 89, and 76 QTLs were identified for three yield traits, five fiber quality traits, and six cottonseed nutrient quality traits, respectively. Favorable alleles of 104 QTLs were contributed by G. tomentosum. Sixty-four QTL were identified in two or more environments, and candidate genes for three of them were further identified. The results of this study contributed to further study on the genetic basis of the morphogenesis of these economic traits, as well as indicating that the great breeding potentials of G. tomentosum in improving the fiber- and seed-related traits in G. hirsutum.