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Applied and Environmental Microbiology, September 1999, p. 3976-3981, Vol. 65, No. 9
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Phylogenetic Affiliation and Quantification of Psychrophilic Sulfate-Reducing Isolates in Marine Arctic Sediments

Kerstin Sahm,1,* Christian Knoblauch,2 and Rudolf Amann1

Molecular Ecology Group1 and Biogeochemistry Group,2 Max-Planck-Institute for Marine Microbiology, D-28359 Bremen, Germany

Received 2 April 1999/Accepted 2 July 1999

Thirteen psychrophilic sulfate-reducing isolates from two permanently cold fjords of the Arctic island Spitsbergen (Hornsund and Storfjord) were phylogenetically analyzed. They all belonged to the delta  subclass of Proteobacteria and were widely distributed within this group, indicating that psychrophily is a polyphyletic property. A new 16S rRNA-directed oligonucleotide probe was designed against the largest coherent cluster of these isolates. The new probe, as well as a set of available probes, was applied in rRNA slot blot hybridization to investigate the composition of the sulfate-reducing bacterial community in the sediments. rRNA related to the new cluster of incompletely oxidizing, psychrophilic isolates made up 1.4 to 20.9% of eubacterial rRNA at Storfjord and 0.6 to 3.5% of eubacterial rRNA at Hornsund. This group was the second-most-abundant group of sulfate reducers at these sites. Denaturing gradient gel electrophoresis and hybridization analysis showed bands identical to those produced by our isolates. The data indicate that the psychrophilic isolates are quantitatively important in Svalbard sediments.

* Corresponding author. Present address: Biotechnology I, Technology Microbiology, Technical University Hamburg-Harburg, Denickestr. 15, D-21073 Hamburg, Germany. Phone: 49 (0)420 42878 3336. Fax: 49 (0)40 42878 2909. E-mail: ksahm{at}mpi-bremen.de.

Applied and Environmental Microbiology, September 1999, p. 3976-3981, Vol. 65, No. 9
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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