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Applied and Environmental Microbiology, October 2003, p. 6143-6151, Vol. 69, No. 10
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.10.6143-6151.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Radioisotopic, Culture-Based, and Oligonucleotide Microchip Analyses of Thermophilic Microbial Communities in a Continental High-Temperature Petroleum Reservoir{dagger}

Elizaveta A. Bonch-Osmolovskaya,1* Margarita L. Miroshnichenko,1 Alexander V. Lebedinsky,1 Nikolai A. Chernyh,1 Tamara N. Nazina,1 Valery S. Ivoilov,1 Sergey S. Belyaev,1 Eugenia S. Boulygina,2 Yury P. Lysov,2 Alexander N. Perov,2 Andrei D. Mirzabekov ,2,{ddagger} Hans Hippe,3 Erko Stackebrandt,3 Stéphane L'Haridon,4 and Christian Jeanthon4

Institute of Microbiology, Russian Academy of Sciences, 117312 Moscow,1 Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, 117984 Moscow, Russia,2 German Collection of Microorganisms and Cell Cultures (DSMZ), 38124 Braunschweig, Germany,3 UMR 6539, Centre National de la Recherche Scientifique and Université de Bretagne Occidentale, Institut Universitaire Européen de la Mer, 29280 Plouzané, France4

Received 19 March 2003/ Accepted 1 August 2003

Activity measurements by radioisotopic methods and cultural and molecular approaches were used in parallel to investigate the microbial biodiversity and its physiological potential in formation waters of the Samotlor high-temperature oil reservoir (Western Siberia, Russia). Sulfate reduction with rates not exceeding 20 nmol of H2S liter-1 day-1 occurred at 60 and 80°C. In upper horizons (AB, A, and B), methanogenesis (lithotrophic and/or acetoclastic) was detected only in wells in which sulfate reduction did not occur. In some of the wells from deeper (J) horizons, high-temperature sulfate reduction and methanogenesis occurred simultaneously, the rate of lithotrophic methanogenesis exceeding 80 nmol of CH4 liter-1 day-1. Enrichment cultures indicated the presence of diverse physiological groups representing aerobic and anaerobic thermophiles and hyperthermophiles; fermentative organotrophs were predominant. Phylogenetic analyses of 15 isolates identified representatives of the genera Thermotoga, Thermoanaerobacter, Geobacillus, Petrotoga, Thermosipho, and Thermococcus, the latter four being represented by new species. Except for Thermosipho, the isolates were members of genera recovered earlier from similar habitats. DNA obtained from three samples was hybridized with a set of oligonucleotide probes targeting selected microbial groups encompassing key genera of thermophilic bacteria and archaea. Oligonucleotide microchip analyses confirmed the cultural data but also revealed the presence of several groups of microorganisms that escaped cultivation, among them representatives of the Aquificales/Desulfurobacterium-Thermovibrio cluster and of the genera Desulfurococcus and Thermus, up to now unknown in this habitat. The unexpected presence of these organisms suggests that their distribution may be much wider than suspected.

* Corresponding author. Mailing address: Institute of Microbiology, Russian Academy of Sciences, Prospect 60-letiya Oktyabrya 7/2, 117312 Moscow, Russia. Phone: 7-095-135-4458. Fax: 7-095-135-6530. E-mail: lbo{at}mail.ru.

{dagger} This paper is dedicated to the memory of A. D. Mirzabekov.

{ddagger} Deceased.

Applied and Environmental Microbiology, October 2003, p. 6143-6151, Vol. 69, No. 10
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.10.6143-6151.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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