Journal
MICROBIOLOGY
Volume 78, Issue 2, Pages 227-233Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0026261709020143
Keywords
cellulose decomposition; Sphagnum bogs; Streptomyces spp.; regulation of cellulolytic activity; N-2 fixation
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Funding
- Russian Foundation for Basic Research [07-04-91561]
- Russian Academy of Sciences Molecular and Cell Biology
- Russian Science Support Foundation
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Two strains of Actinobacteria, ACTY and ACTR, were isolated from cellulolytic microbial communities obtained from an ombrotrophic Sphagnum peat bog. The strains were able to degrade cellulose, the main component of plant phytomass in this ecosystem. On the basis of their phenotypic and phylogenetic characteristics, the strains were identified as members of the genus Streptomyces. The isolates developed on media without available nitrogen sources and hydrolyzed cellulose within a temperature range of 5-25A degrees C and in the pH interval from 4.5 to 6.0; they also exhibited acetylene reduction activity. Comparative analysis of the rates of cellulose degradation by the peat-inhabiting streptomyces at 5, 15, and 25A degrees C and at pH values of 4.5 and 6.0, with and without a source of available nitrogen in the medium, indicated that high acidity and low temperatures, typical for boreal Sphagnum peat bogs, are the main factors limiting the growth and hydrolytic activity of these bacteria.
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