Abstract:

To offer theoretical reference for wheat quality genetic improvement research and fine mapping of related genes, the Double Haploid Lines (DH) derived from the cross between ‘Huapei 3’ and ‘Luomai 4’ were used to analyze the genetic way and to identify QTLs for flour swelling power. Composite Interval Mapping was used in QTL Mapping. The results were described as below: swelling character was quantitative in nature, and controlled by many genes with small effects. Two QTLs for flour swelling were identified and mapped on chromosome 4A by analyzing the DH population in Beijing. They were from the additive effect of ‘Huapei3’alleles, their effect values were 0.4298 and 0.5948, respectively. However, one QTL was identified and mapped on chromosome 4A by analyzing the DH population in Henan Province. The location was from the reductive effect of ‘Huapei3’ alleles, the effect value was 0.3024. Three QTLs were located in different intervals on chromosome 4A, explaining 37.92% of the phenotypic variations. No common QTLs was detected in two areas. Although the contribution rate of two QTLs were 11.29% and 21.48% in Beijing and were not stable QTLs. Maybe their applications were not of great value in Marker-assisted Selection for flour swelling power.