Box-whisker plots of flowering time BLUEs for Ppd-H1 haplotypes. Green box-whisker-plots display the distribution of flowering time BLUEs of all HEB lines carrying the respective haplotype. Horizontal lines and diamonds indicate median and mean, respectively, for each haplotype. The extension of vertical lines indicates minimum and maximum observations, excluding outliers, which are indicated as circles. The red dotted horizontal line indicates the BLUE of cultivar Barke (68.2 days). H-2 represents the haplotype of the Barke genotype present in HEB lines. All haplotypes except H-45 differ significantly (P < 0.05) from H-2, as indicated by red asterisks. Further information to haplotypes is given in Additional files 1 and 8.