Figure 3

Physical clustering of differentially expressed genes at the chromosome level. Genes that were differentially expressed between phenotypic groups of trees were mapped on to the chromosome where they were most abundant for that trait, as indicated. The distribution along single chromosomes of genes that were differentially expressed between phenotypic groups of trees based on resistance to powdery mildew disease (a), resistance to woolly apple aphid (b), and four different gene expression markers (GEMs, c-f) are shown. Asterisk indicates chromosome segment containing the major, previously identified QTL for the trait (a, b) or containing the gene expression marker gene used as the molecular trait (c-e).