Ninety-nine recombinant inbred lines (RILs) were grown for three years and yield components were evaluated. Composite interval mapping showed that the vrs1 and uzu genes consistently controlled grain weight per plant. The analyses also identified a new QTL of kernel length on chromosome 3H, a QTL for kernel width on chromosome 6H and a QTL for thousand-kernel weight on chromosome 2H. The QTL generated in this study may be a useful target for marker-assisted selection in breeding programs.