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Int J Syst Bacteriol 43 (1993), 754-760; DOI 10.1099/00207713-43-4-754
© 1993 Society for General Microbiology
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Phylogeny of Twenty Thermus Isolates Constructed from 16S rRNA Gene Sequence Data

D. J. SAUL1, A. G. RODRIGO2, R. A. REEVES1, L. C. WILLIAMS1, K. M. BORGES3, H. W. MORGAN4 and P. L. BERGQUIST1,*

1 Molecular Genetics and Microbiology, School of Biological Sciences, University of Auckland, Private Bag 92019, Auckland
2 Molecular Genetics and Experimental Biology, School of Biological Sciences, University of Auckland, Private Bag 92019, Auckland
4 Thermophile Genetics, University of Waikato, Hamilton, New Zealand
3 Center for Marine Biotechnology, Baltimore, Maryland 21202

* Corresponding author.

ABSTRACT

The sequences of the 16S rRNA genes of 20 Thermus isolates were determined to a high fidelity by using automated DNA sequencing and fluorescent-dye-labelled primers. The strains tested included members of the three validly named Thermus species and representatives of major taxonomic clusters defined previously for this genus. The parsimony method was used to reconstruct the phylogeny of the strains from the aligned sequences, and a bootstrap analysis revealed a number of well-supported clades. Our results are not consistent with groupings inferred from numerical taxonomy data but support the conjecture that the genus Thermus contains more species than the three currently recognized species.




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