The structure of the bacterial heterotrophic block in tundra soils of Yamal Peninsula

The tundra cryogenic soils of Yamal Peninsula have a high pool of prokaryote microorganisms characteristic of ecosystems where the environmental conditions are unfavorable for microbiological processes. The lowering of the cultivation temperature from 20 to 5°C did not affect the number of bacteria...

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Bibliographic Details
Published in:Eurasian soil science 2009-04, Vol.42 (4), p.426-431
Main Authors: Kukharenko, O. S., Dobrovol’skaya, T. G., Golovchenko, A. V., Stepanov, A. L., Matyshak, G. V.
Format: Article
Language:English
Subjects:
Bacillus
Bacteria
BCG
BCG vaccines
Cultivation
Earth and Environmental Science
Earth Sciences
Environmental conditions
Geotechnical Engineering & Applied Earth Sciences
Low temperature
Microorganisms
Soil Biology
Soil microbiology
Soil sciences
Soils
Studies
Tundra
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Summary:The tundra cryogenic soils of Yamal Peninsula have a high pool of prokaryote microorganisms characteristic of ecosystems where the environmental conditions are unfavorable for microbiological processes. The lowering of the cultivation temperature from 20 to 5°C did not affect the number of bacteria and their taxonomic structure. Psychrotolerant gram-negative bacteria represented by oligotrophs and copiotrophs predominated in the bacterial communities. Among the bacteria of the hydrolytic block, only bacilli were isolated upon cultivation on the media. The species spectrum of the Bacillus genus was determined by the capability of its representatives for growth at low temperatures. The bacteria isolated from the cryogenic soils had a high nitrogenase activity, which increased under the lower cultivation temperature. This fact shows that the majority of the bacteria in tundra soils has adapted to functioning at low temperatures.
ISSN:1064-2293
1556-195X
DOI:10.1134/S1064229309040097