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Department of Microbiology, University of Massachusetts, Amherst, MA 01003, USA
Correspondence
Derek R. Lovley
dlovley{at}microbio.umass.edu
To further investigate the diversity of micro-organisms capable of conserving energy to support growth from dissimilatory Fe(III) reduction, Fe(III)-reducing micro-organisms were enriched and isolated from subsurface sediments collected in Oyster Bay, VA, USA. A novel isolate, designated T118T, was recovered in a medium with lactate as the sole electron donor and Fe(III) as the sole electron acceptor. Cells of T118T were Gram-negative, motile, short rods with a single polar flagellum. Strain T118T grew between pH 6·7 and 7·1, with a temperature range of 4–30 °C. The optimal growth temperature was 25 °C. Electron donors utilized by strain T118T with Fe(III) as the sole electron acceptor included acetate, lactate, malate, propionate, pyruvate, succinate and benzoate. None of the compounds tested was fermented. Electron acceptors utilized with either acetate or lactate as the electron donor included Fe(III)–NTA (nitrilotriacetic acid), Mn(IV) oxide, nitrate, fumarate and oxygen. Phylogenetic analysis demonstrated that strain T118T is most closely related to the genus Rhodoferax. Unlike other species in this genus, strain T118T is not a phototroph and does not ferment fructose. However, phototrophic genes may be present but not expressed under the experimental conditions tested. No Rhodoferax species have been reported to grow via dissimilatory Fe(III) reduction. Based on these physiological and phylogenetic differences, strain T118T (=ATCC BAA-621T=DSM 15236T) is proposed as a novel species, Rhodoferax ferrireducens sp. nov.
Published online ahead of print on 4 October 2002 as DOI 10.1099/ijs.0.02298-0.
The GenBank/EMBL/DDBJ accession number for the 16S rDNA sequence of strain T118T is AF435948.
Present address: GeoSyntec Inc., 629 Massachusetts Avenue, Boxborough, MA 01719, USA.
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