The phylogenetic relationships of the type strains of 16 species were investigated by performing a comparative analysis of the sequences of the 16S rRNA genes of these organisms. The sequence data were analyzed by the neighbor-joining method, and each branch was supported by moderate bootstrap values. The phylogenetic tree and sequence analyses confirmed that the genus is composed of species that exhibit considerable heterogeneity and form four clades that are intermixed with members of other genera, such as , and Cluster I includes the type strains of , and and corresponds to Dye's herbicola group. Cluster II consists of , and Cluster III consists of subspecies and and is characterized by the production of pectate lyases and cellulases. , and form the cluster that is most distantly related to other species. The data from the sequence analyses are discussed in the context of biochemical and DNA-DNA hybridization data.


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