Evaluation of Chromosome Segment Substitution Lines Related to Fiber Yield and Quality Traits from Gossypium hirsutum×Gossypium barbadense

Three generations of chromosome segment substitution lines lines (BC₄F₃, BC₄F_3:4, and BC₄F_3:5, Anyang, Korla) were used to evaluate phenotypic traits related to fiber yield and quality. The average performance of the traits in the population was near to the control, CCRI45, in the four populations. Seventy-eight percent of the lines showed longer and stronger fibers than the recurrent parent, and 22.59%～53.61% of lines had bigger bolls and higher lint percentages than the recurrent parent. Correlation analysis showed that the yield and fiber quality traits were positively correlated among the four populations. These results indicated that most of the genetic background in the substitution lines has been restored to the recurrent parent with abundant genetic variations. In addition, most of substitution lines had good yield and fiber quality. This study provided a large amount of basic research materials for cotton quantity genetics, gene pyramiding, and gene function analysis, and provided parent materials and new strains that can directly applied for cotton breeding.