Survival of Micromycetes and Actinobacteria under Conditions of Long-Term Natural Cryopreservation |
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| Authors: | G. A. Kochkina N. E. Ivanushkina S. G. Karasev E. Yu. Gavrish L. V. Gurina L. I. Evtushenko E. V. Spirina E. A. Vorob'eva D. A. Gilichinskii S. M. Ozerskaya |
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| Affiliation: | (1) Russian Academy of Sciences, Skryabin Institute of Biochemistry and Physiology of Microorganisms, pr. Nauki 5, Pushchino, Moscow oblast, 142290, Russia;(2) Pushchino State University, Pushchino, Moscow oblast, 142290, Russia;(3) Institute of Physicochemical and Biological Problems of Soil Science, Russian Academy of Sciences, Pushchino, Moscow oblast, 142290, Russia;(4) Faculty of Soil Science, Moscow State University, Vorob'evy gory, Moscow, 119899, Russia |
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| Abstract: | Almost all of the investigated samples of the Arctic and Antarctic permafrost sediments of different genesis with ages from 5–10 thousand to 2–3 million years were found to contain viable micromycete and bacterial cells. The maximum amounts of viable cells of fungi (up to 104CFU/g air-dried sample) and bacteria (up to 107–109CFU/g air-dried sample) were present in fine peaty sediment samples taken from different depths. The identified micromycetes belonged to more than 20 genera of the divisions Basidiomycota, Ascomycota, and Zygomycota, and some represented mitosporic fungi. Thawing the samples at 35 and 52°C allowed the number of detected fungal genera to be increased by more than 30%. Aerobic heterotrophic prokaryotes were dominated by coryneform, nocardioform, and spore-forming microorganisms of the order Actinomycetales.Analysis of the isolated fungi and actinomycetes showed that most of them originated from the microbial communities of ancient terrestrial biocenoses. |
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| Keywords: | permafrost mycelial fungi actinobacteria identification |
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