Molecular marker of QTL for fibre quality traits of upland cotton with elite fibre quality.

In order to detect and exploit the QTLs related to superior fiber qualities in upland cotton(Gossypium hirsutum) accession NM 03102,we constructed an F2 and its corresponding F2:3 populations by crossing Lumianyan 21 to NM 03102 and employed 7892 simple sequence repeats(SSR) primer pairs to screen the polymorphism between the two parents,222 polymorphic primer pairs were obtained for genotyping the 195 individual plants of F2 population,and 242 loci were obtained.The linkage test indicated that 182 loci could be mapped to 37 linkage groups,35 of them could be assigned to 20 chromosomes.The linkage map covered 1661.6 cM,about 37.34% of the whole genome,and the average distance between two loci was 9.1 cM.20 QTLs were detected based on Composite Interval Mapping(CIM) method,4 for fiber length,4 for fiber strength,5 for fiber micronaire value,4 for fiber uniformity ration and 3 for fiber elongation,respectively.These QTLs could explain 5.10%～28.49% of the corresponding phenotypic variations.QTLs qFS-5-1 and qFU-24-1 were consistent with previous reports in different mapping populations.And 2 QTLs(qFS-5-1 and qFMIC-1-1) could be detected in both F2 and F2:3 generations.These stable QTL might be utilized to improve the fiber qualities in the molecular markers assisted selection(MAS) breeding programs.