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Co-occurrence of Fe and P stress in natural populations of the marine diazotroph Trichodesmium
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Abstract
Trichodesmium is a globally important marine microbe that provides fixed nitrogen (N) to otherwise N-limited ecosystems. In nature, nitrogen fixation is likely regulated by iron or phosphate availability, but the extent and interaction of these controls are unclear. From metaproteomics analyses using established protein biomarkers for nutrient stress, we found that iron–phosphate co-stress is the norm rather than the exception for Trichodesmium colonies in the North Atlantic Ocean. Counterintuitively, the nitrogenase enzyme was more abundant under co-stress as opposed to single nutrient stress. This is consistent with the idea that Trichodesmium has a specific physiological state during nutrient co-stress. Organic nitrogen uptake was observed and occurred simultaneously with nitrogen fixation. The quantification of the phosphate ABC transporter PstA combined with a cellular model of nutrient uptake suggested that Trichodesmium is generally confronted by the biophysical limits of membrane space and diffusion rates for iron and phosphate acquisition in the field. Colony formation may benefit nutrient acquisition from particulate and organic sources, alleviating these pressures. The results highlight that to predict the behavior of Trichodesmium , both Fe and P stress must be evaluated simultaneously.
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Metadata
- Authors
- Held, N. A., Webb, E. A., McIlvin, M. M., Hutchins, D. A., Cohen, N. R., Moran, D. M., Kunde, K., Lohan, M. C., Mahaffey, C., Woodward, E. M. S., & Saito, M. A.
- Affiliations
- Massachusetts Institute of Technology (US)
- University of Southern California (US)
- Woods Hole Oceanographic Institution (US)
- National Oceanography Centre (GB)
- University of Liverpool (GB)
- Plymouth Marine Laboratory (GB)
- Corresponding author
- Held, Noelle A.
- Webb, Eric A.
- Hutchins, David A.
- Cohen, Natalie R.
- Moran, Dawn M.
- Kunde, Korinna
- Lohan, Maeve C.
- Mahaffey, Claire
- Woodward, E. Malcolm S.
- Saito, Mak A.
- ORCID
- Venue
- Biogeosciences
- Publisher
- Copernicus GmbH
- Published
- 2020-05-12
- Volume
- 17
- Issue
- 9
- Pages
- 2537-2551
- ISSN
- 1726-4170 (ISSN-L)
- 1726-4189
- OpenAlex
- W2998863824
- Cited by
- 45
- References
- 1
- Citations by year
- 2026: 2 · 2025: 5 · 2024: 11 · 2023: 8 · 2022: 7 · 2021: 7 · 2020: 5
- FWCI
- 3.36
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Biogeosciences (publishedVersion, cc-by)
- Marine Biological Association (acceptedVersion)
- ePrints Soton (University of Southampton) (submittedVersion)
- DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by)
- Open Access Server of the Woods Hole Scientific Community (Woods Hole Scientific Community) (submittedVersion, cc-by)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- Division of Graduate Education (1122274)
- Division of Ocean Sciences (1657755, 1657757, 1851222)
- Directorate for Geosciences (1639714)
- Gordon and Betty Moore Foundation (3782)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine Plankton and Biogeochemistry
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Metalloenzymes and iron-sulfur proteins
- Physical Sciences › Environmental Science › Environmental Chemistry › Aquatic Ecosystems and Phytoplankton Dynamics
- Keywords
- Trichodesmium, iron stress, phosphate stress, nitrogen fixation, nitrogenase, organic nitrogen uptake, nutrient acquisition, colony formation, marine diazotrophs, North Atlantic, metaproteomics
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