Fig. 2.

The evolution of P. davidiana. a Phylogenetic tree of 126 peach accessions which included P. persica and its wild relative species. b Principal component analysis (PCA) of above accessions. c Stone steak morphology of P. dulcis, P. mira, P. davidiana, P. kansuensis, and P. ferganensis. d Percent of P. davidiana-specific contigs covered by reads from different Prunus species. e Regional collinearity between P. davidiana with P. dulcis or with P. mira genomes. The detailed location of these three regions were at Chr. 1: 4.79 Mb, Chr. 1: 5.08 Mb, and Chr. 2: 7.50 Mb in P. davidiana genome. Green and blue boxes indicate the positive and negative direction of genes. “P” and “A” letters showed the gene was presence and absence in P. davidiana genome