Crenarchaeota and their role in the nitrogen cycle in a subsurface radioactive thermal spring in the Austrian Central Alps.

Applied and Environmental Microbiology
Gerhard W WeidlerHelga Stan-Lotter

Abstract

Previous results from a 16S rRNA gene library analysis showed high diversity within the prokaryotic community of a subterranean radioactive thermal spring, the "Franz-Josef-Quelle" (FJQ) in Bad Gastein, Austria, as well as evidence for ammonia oxidation by crenarchaeota. This study reports further characterization of the community by denaturing gradient gel electrophoresis (DGGE) analysis, fluorescence in situ hybridization (FISH), and semiquantitative nitrification measurements. DGGE bands from three types of samples (filtered water, biofilms on glass slides, and naturally grown biofilms), including samples collected at two distinct times (January 2005 and July 2006), were analyzed. The archaeal community consisted mainly of Crenarchaeota of the soil-subsurface-freshwater group (group 1.1b) and showed a higher diversity than in the previous 16S rRNA gene library analysis, as was also found for crenarchaeal amoA genes. No bacterial amoA genes were detected. FISH analysis of biofilms indicated the presence of archaeal cells with an abundance of 5.3% (+/-4.5%) in the total 4',6-diamidino-2-phenylindole (DAPI)-stained community. Microcosm experiments of several weeks in duration showed a decline of ammonium that correlated with an...Continue Reading

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Apr 8, 2010·Extremophiles : Life Under Extreme Conditions·Zhao-Qi SongWen-Jun Li
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