Oil content in
cottonseed is a major quality trait which when improved through breeding could enhance the competitiveness of
cottonseed oil among other
vegetable oils.
Cottonseed oil content is a quantitative trait controlled by genes in the
tetraploid embryo and
tetraploid maternal plant genomes, and the knowledge of quantitative trait loci (QTLs) and the genetic effects related to oil content in both genomes could facilitate the improvement in its quality and quantity. However, till date, QTL mapping and genetic analysis related to this trait in cotton have only been conducted in the
tetraploid embryo genome. In the current experiment, an IF(2) population of
cottonseed kernels from the random crossing of 188 intraspecific recombinant inbred lines which were derived from the hybrid of two parents, HS46 and MARCABUCAG8US-1-88, were used to simultaneously locate QTLs for oil content in the embryo and maternal plant genomes. The four QTLs found to be associated with oil content in
cottonseed were: qOC-18-1 on chromosome 18; qOC-LG-11 on linkage group 11; qOC-18-2 on chromosome 18; and qOC-22 on chromosome 22. At a high selection threshold of 0.05, there was strong evidence linking the QTLs above the oil content in
cottonseed. Embryo additive and dominant effects from the
tetraploid embryo genome, as well as maternal additive effects from the
tetraploid maternal plant genome were found to be significant contributors to genetic variation in
cottonseed oil content.