The 16S rRNAs of 15 species of actinomycetes belonging to the genera and Saccharothrix and the , including , and species, were sequenced by using reverse transcriptase. The sequences were analyzed along with the sequences of reference actinomycetes by using distance matrix and parsimony methods. The wall chemotype IV genus was found to be closely related to species of the genus which have chemotype III walls. Together, these two genera formed a clade which was closely related to members of the family which have chemotype IV walls. However, the phylogenetic branching pattern did not unambiguously resolve whether the members of all three taxa should be placed in a single family. We suggest, therefore, that the genera and should remain outside the family until additional sequence or phenotypic data are available to decide the issue. The sequences of species belonging to the genera and were always recovered as a mixed group in phylogenetic trees, and we propose that these organisms should be classified in an emended genus . This proposal is strongly supported by previously published lipid, ribosomal protein, and ultrastructure data.


Article metrics loading...

Loading full text...

Full text loading...


Most cited this month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error