Research Article

Journal of Genetics

, Volume 91, Issue 3, pp 289-295

Mapping of quantitative trait loci for oil content in cottonseed kernel

  • QUAMPAH ALFRED†Affiliated withDepartment of Agronomy, Zhejiang University
  • , HAI YING LIU†Affiliated withDepartment of Agronomy, Zhejiang University
  • , HAI MING XUAffiliated withDepartment of Agronomy, Zhejiang University
  • , JIN RONG LIAffiliated withDepartment of Agronomy, Zhejiang University
  • , JIAN GUO WUAffiliated withDepartment of Agronomy, Zhejiang University
  • , SHUI JIN ZHUAffiliated withDepartment of Agronomy, Zhejiang University Email author 
  • , CHUN HAI SHIAffiliated withDepartment of Agronomy, Zhejiang University Email author 

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Abstract

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 IF2 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.

Keywords

additive effect cottonseed kernel dominant effect embryo genome maternal plant genome oil content