Figure 4
Reconstruction of a hypothetical ancestral Rosaceae genome. Syntenic regions among the genomes were elucidated from the positions of 129 orthologous markers shared by all three genomes. The hypothetical ancestral genome contains nine chromosomes numbered Ancestral 1 (A1) - A9. Sections of the chromosomes of Malus and the linkage groups of Fragaria and Prunus are coloured according to the hypothetical ancestral chromosomes. Breakpoints indicating chromosomal fusion-fission events or reciprocal translocations correspond to arrows between coloured syntenic blocks. Red arrows indicate the positions of major inversions that can be predicted based on the fusion-fission or translocations detected. Extant chromosome/linkage group lengths assume that all nine hypothetical ancestral chromosomes were of the same length.