Carbon fixation and energy metabolisms of a subseafloor olivine biofilm
| Autor: | Martin R. Fisk, F. S. Colwell, Olivia U. Mason, Brandon Kieft, Ryan S. Mueller, Amy R. Smith, Radu Popa |
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| Rok vydání: | 2019 |
| Předmět: |
Anaerobic respiration
Oceans and Seas Microbial metabolism Magnesium Compounds chemistry.chemical_element Aquifer Biology Microbiology Article Carbon Cycle Carbon cycle 03 medical and health sciences Nitrogen Fixation Seawater Groundwater Ecosystem Phylogeny Ecology Evolution Behavior and Systematics 030304 developmental biology Chemosynthesis 0303 health sciences geography geography.geographical_feature_category Bacteria 030306 microbiology Silicates Carbon fixation Archaea Anoxic waters chemistry Biofilms Environmental chemistry Metagenome Energy Metabolism Carbon Genome Bacterial Iron Compounds |
| Zdroj: | ISME J |
| ISSN: | 1751-7370 1751-7362 |
| DOI: | 10.1038/s41396-019-0385-0 |
| Popis: | Earth’s largest aquifer ecosystem resides in igneous oceanic crust, where chemosynthesis and water-rock reactions provide the carbon and energy that support an active deep biosphere. The Calvin Cycle is the predominant carbon fixation pathway in cool, oxic, crust; however, the energy and carbon metabolisms in the deep thermal basaltic aquifer are poorly understood. Anaerobic carbon fixation pathways such as the Wood-Ljungdahl pathway, which uses hydrogen (H(2)) and CO(2), may be common in thermal aquifers since water-rock reactions can produce H(2) in hydrothermal environments and bicarbonate is abundant in seawater. To test this, we reconstructed the metabolisms of eleven bacterial and archaeal metagenome-assembled genomes from an olivine biofilm obtained from a Juan de Fuca Ridge basaltic aquifer. We found that the dominant carbon fixation pathway was the Wood-Ljungdahl pathway, which was present in seven of the eight bacterial genomes. Anaerobic respiration appears to be driven by sulfate reduction, and one bacterial genome contained a complete nitrogen fixation pathway. This study reveals the potential pathways for carbon and energy flux in the deep anoxic thermal aquifer ecosystem, and suggests that ancient H(2)-based chemolithoautotrophy, which once dominated Earth’s early biosphere, may thus remain one of the dominant metabolisms in the suboceanic aquifer today. |
| Databáze: | OpenAIRE |
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