Abstract recent genome analysis of Erwinia amylovora, the causal agent of fire blight disease on Rosaceae, has shown that the chromosome is highly conserved among strains and that plasmids are the principal source of genomic diversity. A new circular plasmid, peA68, was found in E. amylovora strain 692 (lMg 28361), isolated in Poland from Sorbus (mountain ash) with fire blight ... Read more