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Soft rot pectobacteria are devastating plant pathogens with a global distribution and a broad host range.  Pectobacterium aroidearum  L6, previously isolated from leaves of  Syngonium podophyllum , is a pectolytic bacterial pathogen that causes typical soft rot on  S. podophyllum . There is a shortage for genome data of  P. aroidearum , which seriously hinders research on classification and pathogenesis of  Pectobacterium . We present here the complete genome sequence of  P. aroidearum  L6. The L6 strain carries a single 4,995,896-bp chromosome with 53.10% G + C content and harbors 4,306 predicted protein-coding genes. We estimated  in silico  DNA–DNA hybridization and average nucleotide identity values in combination with the whole-genome-based phylogeny from 19  Pectobacterium  strains including  P. aroidearum  L6. The results showed that L6 and PC1 formed a population distinct from other populations of the  Pectobacterium  genus. Phylogenetic analysis based on 16S rRNA and genome sequences showed a close evolutionary relationship among  Pectobacterium  species. Overall, evolutionary analysis showed that L6 was in the same branch with PC1. In comparison with 18  Pectobacterium  spp. reference pathogens, strain L6 had 2,712 gene families, among which 1,632 gene families were identified as orthologous to those strains, as well as 1 putative unique gene family. We discovered 478 genes, 10.4% of the total of predicted genes, that were potentially related to pathogenesis using the Virulence Factors of Pathogenic Bacteria database. A total of 25 genes were related to toxins, 35 encoded plant cell-wall degrading enzymes, and 122 were involved in secretion systems. This study provides a foundation for a better understanding of the genomic structure of  P. aroidearum  and particularly offers information for the discovery of potential pathogenic factors and the development of more effective strategies against this pathogen.

Analysis of the Taxonomy and Pathogenic Factors of Pectobacterium aroidearum L6 Using Whole-Genome Sequencing and Comparative Genomics