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Title: Deep subsurface life from North Pond: Enrichment, isolation, characterization and genomes of heterotrophic bacteria

Journal Article · · Frontiers in Microbiology
 [1];  [1];  [2];  [1]
  1. Univ. of Delaware, Lewes, DE, (United States)
  2. The Ohio State Univ., Columbus, OH (United States)

Studies of subsurface microorganisms have yielded few environmentally relevant isolates for laboratory studies. In order to address this lack of cultivated microorganisms, we initiated several enrichments on sediment and underlying basalt samples from North Pond, a sediment basin ringed by basalt outcrops underlying an oligotrophic watercolumn west of the Mid-Atlantic Ridge at 22° N. In contrast to anoxic enrichments, growth was observed in aerobic, heterotrophic enrichments from sediment of IODP Hole U1382B at 4 and 68 m below seafloor (mbsf). These sediment depths, respectively, correspond to the fringes of oxygen penetration from overlying seawater in the top of the sediment column and upward migration of oxygen from oxic seawater from the basalt aquifer below the sediment. Here we report the enrichment, isolation, initial characterization and genomes of three isolated aerobic heterotrophs from North Pond sediments; an Arthrobacter species from 4 mbsf, and Paracoccus and Pseudomonas species from 68 mbsf. These cultivated bacteria are represented in the amplicon 16S rRNA gene libraries created from whole sediments, albeit at low (up to 2%) relative abundance. We provide genomic evidence from our isolates demonstrating that the Arthrobacter and Pseudomonas isolates have the potential to respire nitrate and oxygen, though dissimilatory nitrate reduction could not be confirmed in laboratory cultures. Furthermore, the cultures from this study represent members of abundant phyla, as determined by amplicon sequencing of environmental DNA extracts, and allow for further studies into geochemical factors impacting life in the deep subsurface.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
OCE-0939564; SAF-12-05; PEA336; AC02-05CH11231
OSTI ID:
1258445
Journal Information:
Frontiers in Microbiology, Vol. 7; ISSN 1664-302X
Publisher:
Frontiers Research FoundationCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

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Cited By (7)

Ecology and evolution of seafloor and subseafloor microbial communities journal July 2018
Survival of the fewest: Microbial dormancy and maintenance in marine sediments through deep time journal September 2018
Diversity and extracellular enzyme activities of heterotrophic bacteria from sediments of the Central Indian Ocean Basin journal June 2019
BusyBee Web: metagenomic data analysis by bootstrapped supervised binning and annotation journal May 2017
Cytosine methylation within marine sediment microbial communities: potential epigenetic adaptation to the environment journal July 2017
Complete Genome Sequence of Bacillus subtilis Strain 29R7-12, a Piezophilic Bacterium Isolated from Coal-Bearing Sediment 2.4 Kilometers below the Seafloor journal February 2017
Predominance of Viable Spore-Forming Piezophilic Bacteria in High-Pressure Enrichment Cultures from ~1.5 to 2.4 km-Deep Coal-Bearing Sediments below the Ocean Floor journal February 2017

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