QTL LOD profiles of plant height and the position of VRS1 , determined using 138 GPMx RILs. Only chromosomes with significant QTLs are shown: 2H on panel A, 3H on panel B and 5H on panel C. Vertical lines below the graphs show markers on the GBS map. Marker names and GBS map positions surrounding relevant loci are also shown. Co-segregating markers are outlined. The 2009 data are shown in red and 2010 data are in blue. The horizontal dotted line shows the significance threshold. Boxes show the one-LOD support intervals, and whiskers show the two-LOD intervals.