Taxonomic relationships among species of Pectobacterium and description of two novel taxa within the heterogeneous species P. carotovorum namely P. carotovorum subsp. brasiliense subsp. nov. and P. aroideae sp. nov. AFLP MLSA Pectobacteria Syria monomorphic cluster phylogenetic NCBI GenBank sequence classification DNA DNA hybridization threshold. Syrien monomorph phylogenetisch Sequenz Klassifizierung DNA DNA Hybridisierung Grenzwert