Pectobacterium atrosepticum is part of a larger family of soft rot bacteria(Pectobacteriaceae)that cause disease on a wide range of crops worldwide.They are closely related to members of the Enterobacteriaceae and,as the plant pathogens and plant associated members of the group,form part of a continuum towards opportunistic and more devastating animal and human pathogens.Many of the horizontally acquired islands present in the genome of P.atrosepticum are directly responsible for life on plants.These include genes for a plethora of plant cell wall degrading enzymes,plant toxins,siderophores etc.,which are exported by multiple secretion systems under a highly coordinated regulation system.
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