P. persica (A), M. domestica (B), and F. vesca (C) S-RNase lineage genes are marked in pink, SFB, SFBB, and SLFL lineage genes are marked in blue. Different shapes represent the different S-RNase and F-box SFB-, SFBB-, and SLFL- lineage genes. To represent two or more sequential genes, a bracket at the left of the chromosome is used. Each Prunus chromosome is marked in a different colour: PG1- pink, PG2 light green, PG3 light blue, PG4- purple, PG5- yellow, PG6-green, PG7- orange, and PG8-red. These colours are then used to assign the synteny regions for the M. domestica and F. vesca chromosomes, according to Fig 1in Jung et al., [65]. Regions with unknown synteny but between regions that show synteny with the same chromosome are marked in stripes, and regions with unknown synteny between syntenic regions from different chromosomes are marked in grey. Brackets on the right of each chromosome represent the nine ancestral synteny regions (1 to 9) according to Fig 4 in Illa et al. [72].