Distribution in each functional COG category of the putative ancestral genes of X. axonopodis pv. vesicatoria that were conserved or lost by X. albilineans or X. fastidiosa. These putative ancestral genes correspond to the 2816 CDSs of the X. axonopodis pv.vesicatoria strain 85-10 chromosome shared with S. maltophilia strain R551-3, S. maltophilia strain K279a, X. albilineans strain GPE PC73 or X. fastidiosa strain 9a5c. They are listed and individually analysed in Additional file 1. XCV = X. axonopodis pv.vesicatoria strain 85-10; XAL = X. albilineans strain GPE PC73; SMA = S. maltophilia strain R551-3 or S. maltophilia strain K279a; XYL = X. fastidiosa strain 9a5c.