Figure 3

Genomic distribution of sRNAs in a subset of the 19 Populus chromosomes. Coloured bars, above the axis for plus strand and below the axis for minus strand, show expression counts in 0.1 Mb windows for 18 (grey), 19 (yellow), 20 (purple), 21 (cyan), 22 (dark blue), 23 (green) and 24 (red) nucleotide sequences along LG_I (A), LG_XIX (B) and LG_VII (C). Below each plot the frequency distribution in 0.1 Mb windows for gene (top) and repeat density (bottom) is shown. Repeat density was calculated using RepeatMasker data from the PopGenIE web resource [29].