Figure 1

Allelic bias in transcript accumulation within F1 hybrid plants. The x-axis indicates genetic position along consecutively ordered chromosomes of the H. annuus genome (Additional file 2: Table S3); chromosome borders are delineated in the black and white bar labeled “CHR”. “total reads mapped” provides the sum of sequence reads (among 12 samples) assigned to each position. “fixed cmsHA89-Pet2152 SNP” identifies the location of variants used to assign allelic origin (see Methods). “species differences” shows location of contigs showing significant differences in transcript accumulation between H. annuus and H. petiolaris samples. “allele differences” shows the position of contigs identified as showing significant differences in accumulation of parental alleles in F1 hybrid samples. Bars labeled “ALL” and “SPP” show the summed direction of significant parental differences or allelic bias for that genetic map location; red indicates that the H. annuus samples or alleles show higher transcript accumulation, blue indicates that H. petiolaris samples or alleles show higher transcript accumulation.