title: Mapping heterotic loci for yield and agronomic traits using chromosome segment introgression lines in cotton.
abstract: In the present study, a set of chromosome segment introgression lines (CSILs) using Gossypium hirsutum L. TM-1 as the recipient parent and G. barbadense Hai7124 as the donor parent were used to explore the genetic basis of heterosis for interspecific hybrids. Two sets of F₁ populations individually derived from CSILs crossing with both parents were configured to investigate heterotic loci (HL) and substitution effect loci (SL). A total of 58 HL and 39 SL were identified in 3 years. One stable HL, hLP-A4-3, could be detected in all 3 years. Three HLs, hBS-A8-1, hLP-D6-1, and hSI-D7-11, could be detected in 2 years. Four SLs, sBS-D7-1, sLP-A8-1, sLP-D7-1, and sLP-D12-1, could be detected in 2 years. HL and SL tended to be distributed in some HL-rich chromosome segments with close positions. Compared with QTL detected in a former study, HL showed little overlap with QTL, indicating that trait phenotype and heterosis might be controlled by different sets of loci. All three forms of genetic effects (partial-, full-, over-dominant) were identified, while the over-dominant effect made the main contribution to heterosis. These results may help lay the foundation for clarifying the heredity mechanism of heterosis in cotton.
authors.affiliation: College of Agronomy/National Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an 271018, China.
authors.forename: Xian
authors.initials: X
authors.lastname: Guo
authors.forename: Yuping
authors.initials: Y
authors.lastname: Guo
authors.forename: Jun
authors.initials: J
authors.lastname: Ma
authors.forename: Fang
authors.initials: F
authors.lastname: Wang
authors.forename: Mizhen
authors.initials: M
authors.lastname: Sun
authors.forename: Lijuan
authors.initials: L
authors.lastname: Gui
authors.forename: Jiajia
authors.initials: J
authors.lastname: Zhou
authors.forename: Xianliang
authors.initials: X
authors.lastname: Song
authors.forename: Xuezhen
authors.initials: X
authors.lastname: Sun
authors.forename: Tianzhen
authors.initials: T
authors.lastname: Zhang
mesh_terms: D018533:Biomass; D002874:Chromosome Mapping; D032461:Chromosomes, Plant; D018556:Crops, Agricultural / Q000235:genetics; D017343:Genes, Plant; D014644:Genetic Variation; D003368:Gossypium / Q000235:genetics* / Q000254:growth & development; D006823:Hybrid Vigor / Q000235:genetics*
keywords: Cotton; chromosome segment introgression lines; heterosis; heterotic loci