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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 F_1 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.
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 F_1 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 showing 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 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.