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Applied and Environmental Microbiology, September 2002, p. 4613-4622, Vol. 68, No. 9
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.9.4613-4622.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Isolation of Tellurite- and Selenite-Resistant Bacteria from Hydrothermal Vents of the Juan de Fuca Ridge in the Pacific Ocean

Christopher Rathgeber,1 Natalia Yurkova,1 Erko Stackebrandt,2 J. Thomas Beatty,3 and Vladimir Yurkov1*

Department of Microbiology, University of Manitoba, Winnipeg, Manitoba, R3T 2N2 Canada,1 Deutche Sammlung von Mikroorganismen und Zellkulturen Gmbh, D-38124 Braunschweig, Germany,2 Department of Microbiology and Immunology, University of British Columbia, Vancouver, British Columbia, V6T 1Z3 Canada3

Received 21 March 2002/ Accepted 21 June 2002

Deep-ocean hydrothermal-vent environments are rich in heavy metals and metalloids and present excellent sites for the isolation of metal-resistant microorganisms. Both metalloid-oxide-resistant and metalloid-oxide-reducing bacteria were found. Tellurite- and selenite-reducing strains were isolated in high numbers from ocean water near hydrothermal vents, bacterial films, and sulfide-rich rocks. Growth of these isolates in media containing K2TeO3 or Na2SeO3 resulted in the accumulation of metallic tellurium or selenium. The MIC of K2TeO3 ranged from 1,500 to greater than 2,500 µg/ml, and the MIC of Na2SeO3 ranged from 6,000 to greater than 7,000 µg/ml for 10 strains. Phylogenetic analysis of 4 of these 10 strains revealed that they form a branch closely related to members of the genus Pseudoalteromonas, within the {gamma}-3 subclass of the Proteobacteria. All 10 strains were found to be salt tolerant, pH tolerant, and thermotolerant. The metalloid resistance and morphological, physiological, and phylogenetic characteristics of newly isolated strains are described.

* Corresponding author. Mailing address: Department of Microbiology, University of Manitoba, 422 Buller Building, Winnipeg, Manitoba, R3T 2N2 Canada. Phone: (204) 474-6303. Fax: (204) 474-7603. E-mail: vyurkov{at}cc.umanitoba.ca.

Applied and Environmental Microbiology, September 2002, p. 4613-4622, Vol. 68, No. 9
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.9.4613-4622.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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