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Thauera mechernichensis sp. nov., an aerobic denitrifier from a leachate treatment plant

Edzard Scholten¹, Thomas Lukow^1,, Georg Auling¹, Reiner M. Kroppenstedt², Fred A. Rainey³ and Hans Diekmann¹

¹ Institut für Mikrobiologie, Universität Hannover, Hannover, Germany
² DSMZ - Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Braunschweig, Germany
³ Department of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803, USA

Author for correspondence: Hans Diekmann. Tel: +49 511 7624359. Fax: +49 511 7625287. e-mail: diekmann{at}mbox.ifmb.uni-hannover.de

ABSTRACT

A heterotrophic bacterial strain TL1^T capable of aerobic denitrification was previously enriched in continuous culture from a landfill leachate treatment plant and isolated as a pure culture. The taxonomic position of this isolate within the ß-subclass of the Proteobacteria was determined by 16S rDNA sequence analysis and by conventional taxonomy including substrate spectrum, quinone type (ubiquinone Q-8) and cellular fatty acid composition. Detection of the specific polyamine 2-hydroxyputrescine supports the membership of strain TL1^T in the ß-subclass of the Proteobacteria. The results of 16S rDNA sequencing showed that the strain clustered with, but was separate from, Thauera aromatica and Thauera selenatis. DNA-DNA hybridization experiments indicated that the new isolate represents a new species of the genus, for which the name Thauera mechernichensis is proposed; the type strain is DSM 12266^T.

Key Words: Thauera mechernichensis sp. nov. • aerobic denitrification

The EMBL accession numbers for the 16S rDNA sequences of strain TL1^T and T. selenatis strain ATCC 55363^T are Y17590 and Y17591, respectively.

Present address: Max-Planck-lnstitut für Terrestrische Mikrobiologie, Marburg, Germany.

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