Gene density distribution along the short arm of wheat chromosome 1B. The anchored 1BS scaffolds are shown as colored rectangles. The scaffold lengths are scaled to the total length of 1BS. Each color corresponds to one of the five bins (I to V) established based on the synteny of 1BS and Brachypodium Bd2, rice Os5 and sorghum Sb9 regions. The black segments correspond to the heterochromatic regions identified by C-bending. The fractional length from the centromere or the Nor is indicated below the chromosome arm. The proportion of syntenic genes (blue bars) and non-syntenic genes (pink bars and percentage within) is shown for each deletion bin. The density of isolated genes (green bars) and genes organized in islands (yellow bars and percentages within) are shown for each deletion bin. Mb, megabase; Nor, nucleolar organizing region.