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dc.contributor.authorSarkar, Jagannath
dc.contributor.authorMondal, Mahamadul
dc.contributor.authorBhattacharya, Sabyasachi
dc.contributor.authorDutta, Subhajit
dc.contributor.authorChatterjee, Sumit
dc.contributor.authorMondal, Nibendu
dc.contributor.authorSaran, N.
dc.contributor.authorPeketi, A.
dc.contributor.authorMazumdar, A.
dc.contributor.authorGhosh, Wriddhiman
dc.date.accessioned2024-03-31
dc.date.accessioned2024-05-10T06:58:18Z
dc.date.available2024-03-18
dc.date.available2024-05-10T06:58:18Z
dc.date.issued2024
dc.identifier.citationArchives of Microbiology, vol.206(4); 2024; Article no: 179
dc.identifier.issn1432-072X
dc.identifier.otherhttps://link.springer.com/article/10.1007/s00203-024-03875-y
dc.identifier.urihttps://doi.org/10.1007/S00203-024-03875-Y
dc.identifier.urihttp://drs.nio.res.in/drs/handle/2264/9207
dc.descriptionIF(JCR2023) = 2.8
dc.description.abstractSediments underlying marine hypoxic zones are huge sinks of unreacted complex organic matter, where despite acute O2 limitation, obligately aerobic bacteria thrive, and steady depletion of organic carbon takes place within a few meters below the seafloor. However, little knowledge exists about the sustenance and complex carbon degradation potentials of aerobic chemoorganotrophs in these sulfidic ecosystems. We isolated and characterized a number of aerobic bacterial chemoorganoheterotrophs from across a ~ 3 m sediment horizon underlying the perennial hypoxic zone of the eastern Arabian Sea. High levels of sequence correspondence between the isolates’ genomes and the habitat’s metagenomes and metatranscriptomes illustrated that the strains were widespread and active across the sediment cores explored. The isolates catabolized several complex organic compounds of marine and terrestrial origins in the presence of high or low, but not zero, O2. Some of them could also grow anaerobically on yeast extract or acetate by reducing nitrate and/or nitrite. Fermentation did not support growth, but enabled all the strains to maintain a fraction of their cell populations over prolonged anoxia. Under extreme oligotrophy, limited growth followed by protracted stationary phase was observed for all the isolates at low cell density, amid high or low, but not zero, O2 concentration. While population control and maintenance could be particularly useful for the strains’ survival in the critically carbon-depleted layers below the explored sediment depths (core-bottom organic carbon: 0.5–1.0% w/w), metagenomic data suggested that in situ anoxia could be surmounted via potential supplies of cryptic O2 from previously reported sources such as Nitrosopumilus species.
dc.languageen
dc.publisherSpringer
dc.relation.isreferencedbySCI
dc.rightsOnly the author version of the copright reserved papers uploaded. Contact drs@nio.org for any complaints regarding copyright violations
dc.titleExtremely oligotrophic and complex-carbon-degrading microaerobic bacteria from Arabian Sea oxygen minimum zone sediments
dc.typeJournal Article
dc.affiliation.authorDepartment of Biological Sciences, Bose Institute, Kolkata, 700091, West Bengal, India


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