Transient exposure to oxygen or nitrate reveals ecophysiology of fermentative and sulfate-reducing benthic microbial populations

Saad S, Bhatnagar S, Tegetmeyer H, Geelhoed JS, Strous M, Ruff SE (2017)

Zeitschriftenaufsatz | Veröffentlicht | Englisch
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Saad, Sainab; Bhatnagar, Srijak; Tegetmeyer, HalinaUniBi ; Geelhoed, Jeanine S.; Strous, Marc; Ruff, S. Emil
Abstract / Bemerkung
For the anaerobic remineralization of organic matter in marine sediments, sulfate reduction coupled to fermentation plays a key role. Here, we enriched sulfate-reducing/fermentative communities from intertidal sediments under defined conditions in continuous culture. We transiently exposed the cultures to oxygen or nitrate twice daily and investigated the community response. Chemical measurements, provisional genomes and transcriptomic profiles revealed trophic networks of microbial populations. Sulfate reducers coexisted with facultative nitrate reducers or aerobes enabling the community to adjust to nitrate or oxygen pulses. Exposure to oxygen and nitrate impacted the community structure, but did not suppress fermentation or sulfate reduction as community functions, highlighting their stability under dynamic conditions. The most abundant sulfate reducer in all cultures, related to Desulfotignum balticum, appeared to have coupled both acetate- and hydrogen oxidation to sulfate reduction. We describe a novel representative of the widespread uncultured candidate phylum Fermentibacteria (formerly candidate division Hyd24-12). For this strictly anaerobic, obligate fermentative bacterium, we propose the name (U)Sabulitectum silens' and identify it as a partner of sulfate reducers in marine sediments. Overall, we provide insights into the function of fermentative, as well as sulfate-reducing microbial communities and their adaptation to a dynamic environment.
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Saad S, Bhatnagar S, Tegetmeyer H, Geelhoed JS, Strous M, Ruff SE. Transient exposure to oxygen or nitrate reveals ecophysiology of fermentative and sulfate-reducing benthic microbial populations. ENVIRONMENTAL MICROBIOLOGY. 2017;19(12):4866-4881.
Saad, S., Bhatnagar, S., Tegetmeyer, H., Geelhoed, J. S., Strous, M., & Ruff, S. E. (2017). Transient exposure to oxygen or nitrate reveals ecophysiology of fermentative and sulfate-reducing benthic microbial populations. ENVIRONMENTAL MICROBIOLOGY, 19(12), 4866-4881. doi:10.1111/1462-2920.13895
Saad, S., Bhatnagar, S., Tegetmeyer, H., Geelhoed, J. S., Strous, M., and Ruff, S. E. (2017). Transient exposure to oxygen or nitrate reveals ecophysiology of fermentative and sulfate-reducing benthic microbial populations. ENVIRONMENTAL MICROBIOLOGY 19, 4866-4881.
Saad, S., et al., 2017. Transient exposure to oxygen or nitrate reveals ecophysiology of fermentative and sulfate-reducing benthic microbial populations. ENVIRONMENTAL MICROBIOLOGY, 19(12), p 4866-4881.
S. Saad, et al., “Transient exposure to oxygen or nitrate reveals ecophysiology of fermentative and sulfate-reducing benthic microbial populations”, ENVIRONMENTAL MICROBIOLOGY, vol. 19, 2017, pp. 4866-4881.
Saad, S., Bhatnagar, S., Tegetmeyer, H., Geelhoed, J.S., Strous, M., Ruff, S.E.: Transient exposure to oxygen or nitrate reveals ecophysiology of fermentative and sulfate-reducing benthic microbial populations. ENVIRONMENTAL MICROBIOLOGY. 19, 4866-4881 (2017).
Saad, Sainab, Bhatnagar, Srijak, Tegetmeyer, Halina, Geelhoed, Jeanine S., Strous, Marc, and Ruff, S. Emil. “Transient exposure to oxygen or nitrate reveals ecophysiology of fermentative and sulfate-reducing benthic microbial populations”. ENVIRONMENTAL MICROBIOLOGY 19.12 (2017): 4866-4881.

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