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Thermophilic bacteria are permanent components of soil and sediment microbial communities

AuthorsPiñeiro-Vidal, M. ; Santana, Margarida; González Grau, Juan Miguel
Issue Date25-Aug-2014
PublisherInternational Society for Microbial Ecology
Citation15th International Symposium on Microbial Ecology (ISME), 24 - 29 August 2014 Seoul (South Korea)
AbstractThermophilic microorganisms are present in soils and sediments. An important potential role of these thermophiles in nutrient cycling at elevated temperatures has been reported. Besides, organic carbon and nitrogen cycling, their participation in organic-sulfur mineralization represents a key step in soil microbial processes. Over 50% of Earth land in located at medium and low latitudes (≤40º) and at these sites there are significant exposures to high temperature conditions showing temperatures ≥30ºC for at least 1/3 of days per year. The question to be resolved is whether these thermophiles represent a natural constituent of these communities, with specific roles and different strains/species adapted to specific conditions and niches or, on the contrary, they are present in these soils by chance arbitrarily transported by different mechanisms. We analyzed the presence of these thermophiles by sampling at different seasons and under different conditions of temperature, salinity, water availability and pH at Doñana National Park (Southwest Spain). Thermophilic microorganisms were selected at 60ºC. Genomic DNA from these thermophilic communities was processed by shotgun sequencing using high-throughput sequences technologies. Sequences belonged mostly to the phylum Firmicutes mainly within the genus Geobacillus and, at a lower proportion, from other thermophilic Firmicutes. Comparative analysis of the metagenomic sequence data studying a number of conserved, housekeeping, genes revealed the presence of different strains at sites exposed to different environmental conditions. These results suggest that thermophilic bacteria represent an important and permanent component of soil microbial communities with specific functional roles and specific niches to thrive in even if they usually represent only a minor component of the total microbial communities.
Publisher version (URL)http://www.isme-microbes.org/isme15
Appears in Collections:(IRNAS) Comunicaciones congresos
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