Figure 2.

Comparison of two QTLs for resistance to Hessian fly. A). The position of the QHf.osu-1A ^d locus in the Duster × Billings DH population was mapped using 176 GBS markers. The physical location of the QTL on the short arm of chromosome 1A was validated by using Xcfd15 and TaOPR-A1 markers that are highlighted in red. The gene at the QHf.osu-1A ^d locus is centered in a 2.6 cM region flanked by GBS07851 and GBS10205 markers that are highlighted in blue. The telomere region of chromosome 1AS that is not covered by GBS markers is indicated by a chromosomal fragment with a dotted line. B). The position of the QHf.osu-1A ⁷⁴ locus in the 144 Jagger × 2174 RILs was mapped using 154 SNP markers and 15 other markers. The physical location of the QTL on the short arm of chromosome 1A was validated by using TaOPR-A1 and Xcfd15 markers that are highlighted in red. The gene at the QHf.osu-1A ⁷⁴ locus is centered in a small region indicated with purple and covering TaOPR-A1 and Pm3. The vertical dotted line indicates the logarithm of the odds (LOD) significance threshold of 2.5. Common markers TaOPR-A1 and Xcfd15 on the two maps are aligned up to indicate their relative positions on chromosome 1AS. QHf.osu-1A ^d is on the proximal side of the common markers, whereas QHf.osu-1A ⁷⁴ is on the distal side of the common markers.