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Applied and Environmental Microbiology, March 1999, p. 1325-1330, Vol. 65, No. 3
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

In Situ Analysis of Phototrophic Sulfur Bacteria in the Chemocline of Meromictic Lake Cadagno (Switzerland)

Mauro Tonolla,* Antonella Demarta,1 Raffaele Peduzzi,1 and Dittmar Hahn2,3

Cantonal Institute of Bacteriology, Microbial Ecology (University of Geneva), CH-6904 Lugano,1 and Swiss Federal Institute of Technology (ETH), Institute of Terrestrial Ecology, Soil Biology, CH-8952 Schlieren,2 Switzerland, and Department of Biology, Rutgers University, Newark, New Jersey 07102-18113

Received 5 August 1998/Accepted 8 December 1998

Comparative sequence analysis of a 16S rRNA gene clone library from the chemocline of the meromictic Lake Cadagno (Switzerland) revealed the presence of a diverse number of phototrophic sulfur bacteria. Sequences resembled those of rRNA of type strains Chromatium okenii DSM169 and Amoebobacter purpureus DSM4197, as well as those of four bacteria forming a tight cluster with A. purpureus DSM4197 and Lamprocystis roseopersicina DSM229. In situ hybridization with fluorescent (Cy3 labeled) oligonucleotide probes indicated that all large-celled phototrophic sulfur bacteria in the chemocline of Lake Cadagno were represented by C. okenii DSM169, while small-celled phototrophic sulfur bacteria consisted of four major populations with different distribution profiles in the chemocline indicating different ecophysiological adaptations.


* Corresponding author. Mailing address: Cantonal Institute of Bacteriology, Microbial Ecology, Via Ospedale 6, CH-6904 Lugano, Switzerland. Phone: 41-91-923 25 22. Fax: 41-91-922 09 93. E-mail: mauro.tonolla{at}ti.ch.


Applied and Environmental Microbiology, March 1999, p. 1325-1330, Vol. 65, No. 3
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.



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