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Effect of Freeze-Thaw Cycles on Bacterial Communities of Arctic Tundra Soil

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Abstract

The effect of freeze-thaw (FT) cycles on Arctic tundra soil bacterial community was studied in laboratory microcosms. FT-induced changes to the bacterial community were followed over a 60-day period by terminal restriction fragment length polymorphism (T-RFLP) profiles of amplified 16S rRNA genes and reverse transcribed 16S rRNA. The main phylotypes of the active, RNA-derived bacterial community were identified using clone analysis. Non-metric multidimensional scaling ordination of the T-RFLP profiles indicated some shifts in the bacterial communities after three to five FT cycles at −2, −5, and −10°C as analyzed both from the DNA and rRNA. The dominating T-RFLP peaks remained the same, however, and only slight variation was generally detected in the relative abundance of the main T-RF sizes of either DNA or rRNA. T-RFLP analysis coupled to clone analysis of reverse transcribed 16S rRNA indicated that the initial soil was dominated by members of Bacteroidetes, Acidobacteria, Alpha-, Beta-, and Gammaproteobacteria. The most notable change in the rRNA-derived bacterial community was a decrease in the relative abundance of a Betaproteobacteria-related phylotype after the FT cycles. This phylotype decreased, however, also in the control soil incubated at constant +5°C suggesting that the decrease was not directly related to FT sensitivity. The results indicate that FT caused only minor changes in the bacterial community structure.

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Acknowledgements

We thank Riitta Nielsen and Heidi Kontio for their help in the DNA/RNA extractions. This study was funded by the Academy of Finland (grants 106208, 123725, 105860, and 120089).

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Correspondence to Minna K. Männistö.

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Männistö, M.K., Tiirola, M. & Häggblom, M.M. Effect of Freeze-Thaw Cycles on Bacterial Communities of Arctic Tundra Soil. Microb Ecol 58, 621–631 (2009). https://doi.org/10.1007/s00248-009-9516-x

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