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Applied and Environmental Microbiology, February 2002, p. 933-937, Vol. 68, No. 2
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.2.933-937.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Natural Communities of Novel Archaea and Bacteria with a String-of-Pearls-Like Morphology: Molecular Analysis of the Bacterial Partners

Christine Moissl, Christian Rudolph, and Robert Huber*

Lehrstuhl für Mikrobiologie und Archaeenzentrum, Universität Regensburg, D-93053 Regensburg, Germany

Received 6 August 2001/ Accepted 20 November 2001

A recently discovered bacterial/archaeal association, growing in a string-of-pearls-like structure, thrives in the cold (~10°C) sulfidic marsh water of the Sippenauer Moor near Regensburg, Bavaria, Germany. It forms characteristic, macroscopically visible globules, the pearls, containing microcolonies of novel euryarchaeota, which are surrounded by mainly filamentous bacteria (C. Rudolph, G. Wanner, and R. Huber, Appl. Environ. Microbiol. 67:2336-2344, 2001). Single pearls in series are connected by white threads. Here we report the first detailed molecular investigations of the taxonomic affiliation of the bacteria contributing to the strings of pearls. Phylogenetic analysis showed the dominance of a single phylotype (clone sipK4) within single pearls most closely related to Thiothrix unzii. The presence of Thiothrix sipK4 as a major constituent of single pearls and of the pearl-connecting white threads was verified by fluorescence in situ hybridization.

* Corresponding author. Mailing address: Lehrstuhl für Mikrobiologie und Archaeenzentrum, Universität Regensburg, Universitätsstrasse 31, D-93053 Regensburg, Germany. Phone: 49 (941) 943-3182. Fax: 49 (941) 943-2403. E-mail: robert.huber{at}biologie.uni-regensburg.de.

Applied and Environmental Microbiology, February 2002, p. 933-937, Vol. 68, No. 2
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.2.933-937.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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