Schematic representation of gene regions containing known symbiosis genes of strains sequenced in this study. Strains HAMBI 540T and HAMBI 1141 are reference strains for which the complete genomes were sequenced previously . A) Symbiovar orientalis strains. The genes PA10320 and PA10330 are T1SS genes. B) Symbiovar officinalis strains. The genes PB00900 and PB00910 are T1SS genes.