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1Cooperative Research Centre for Tropical Plant Pathology, The University of Queensland, Brisbane, QLD 4072, Australia
2Department of Microbiology Centre for Bacterial Diversity and Identification, The University of Queensland, Brisbane, QLD 4072, Australia
3CSIRO Tropical Agriculture, St Lucia, QLD 4067, Australia
Author for correspondence: Lindsay I. Sly. Tel: +61 7 3365 2396. Fax: +61 7 3365 1566. e-mail: sly{at}biosci.uq.edu.au
ABSTRACT
The phylogenetic relationships among members of the family Comamonadaceae and several unclassified strains were studied by direct sequencing of their PCR-amplified 16S rRNA genes. Based on the 16S rRNA gene sequence analysis, members of the family formed a coherent group. The closest relatives are species of the Rubrivivax sub-group: Leptothrix discophora, Ideonella dechloratans and Rubrivivax gelatinosus. The genus Hydrogenophaga formed two subclusters, as did the species of Acidovorax, whereas the five species of the genus [Aquaspirillum] were polyphyletic. Comamonas acidovorans was phylogenetically distant from the type species Comamonas, Comamonas terrigenan. On the basis of this work and previous studies, Comamonas acidovorans is removed from the genus Comamonas and renamed as Delftia acidovorans gen. nov., comb. nov. Descriptions of the new genus Delftia and of the type species Delftia acidovorans, for which the type strain is ATCC 15668T, are presented.
Key Words: phylogeny 16S rDNA taxonomy Comamonadaceae Delftia acidovorans
The GenBank accession numbers for the 16S rDNA sequences determined in this study are AF078753-AF078774.
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