ARS | Publication request: MOLECULAR MAPPING OF QTLS FOR FIBER QUALITY IN UPLAND COTTON USING SSR MARKERS

Submitted to: International Cotton Genome Initiative Workshop
Publication Type: Abstract Only
Publication Acceptance Date: October 10, 2004
Publication Date: October 10, 2004
Citation: Zhang, T., Shen, X., Guo, W., Yu, J., Kohel, R.J. 2004. Molecular mapping of QTLs for fiber quality in upland cotton using SSR markers [abstract]. International Cotton Genome Initiative Workshop. p. 33.

Technical Abstract: The improvement of cotton fiber quality is extremely important because of changes in spinning technology. The identification of the stable QTLs affecting fiber traits across different generations will be greatly helpful to be used effectively in molecular marker-assisted selection to improve fiber quality of cotton cultivars in the future. Using three elite fiber lines such as 7235, PD 6992 and HS 427-10 in Upland cotton (Gossypium hirsutum L.) as parents, three linkage maps were constructed to tag QTLs for fiber qualities using SSR markers. There were 38 QTLs detected by composite interval mapping for fiber traits, in which 11 QTLs were for fiber length, 10 for fiber strenght, 9 for Micronaire and 8 for fiber elongation. Most of QTLs detected in (7235 x TM-1) F2 and F2:3 segregating populations. At least 3 identical QTLs could be identified in two populations. These identical QTLs detected in different populations suggested that there existed elite fiber genes, possibly of the same origin. In addition, we found three pairs of putative homoeologous QTLs, qFL-7-1c and qFL-16-1c, qFS-DO3-1a,qFS-AO2-1b and qFS-AO2-1c, qFECD03-1a and qFE-A02-1c. Our results provided a better understanding of the genetic factors of fiber traits in AD tetraploid cottons. Both stable and identical QTLs have a great potential for molecular-assisted selection in improving fiber quality.