Fig. 1

Pan-genome analysis of S. xiamenensis. A Presence/absence matrix of the gene families identified in S. xiamenensis. The pan-genome is subdivided into core, accessory and strain-specific genomes according to the distribution of gene families. B The accumulative curve for the genomes of S. xiamenensis. The curve represented the size of pan and core genomes as the number of genomes increased. C The single-copy gene tree generated by the core nucleotide alignments. The strains were clustered into three major groups (marked as green, blue and purple, respectively) and three singletons (marked as black). The first colored row at the end of branches represented the country where the strains were isolated. The second colored row represented the sources. D The pan-genome tree based on the binary presence/absence matrix of each gene families. The strains were clustered into three major groups (marked as green, blue and purple, respectively) and three singletons (marked as black)