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Carbon acquisition by Trichodesmium: the effect of pCO2 and diurnal changes
Abstract
We investigated carbon acquisition by the N 2‐fixing cyanobacterium Trichodesmium IMS101 in response to CO 2 levels of 15.1, 37.5, and 101.3 Pa (equivalent to 150, 370, and 1000 ppm). In these acclimations, growth rates as well as cellular C and N contents were measured. In vivo activities of carbonic anhydrase (CA), photosynthetic O 2 evolution, and CO 2 and HCO 3‐ fluxes were measured using membrane inlet mass spectrometry and the 14 C disequilibrium technique. While no differences in growth rates were observed, elevated CO 2 levels caused higher C and N quotas and stimulated photosynthesis and N 2 fixation. Minimal extracellular CA (eCA) activity was observed, indicating a minor role in carbon acquisition. Rates of CO 2 uptake were small relative to total inorganic carbon (Ci) fixation, whereas HCO{3 contributed more than 90% and varied only slightly over the light period and between CO 2 treatments. The low eCA activity and preference for HCO 3‐ were verified by the 14 C disequilibrium technique. Regarding apparent affinities, half‐saturation concentrations (K1/2) for photosynthetic O 2 evolution and HCO 3‐ uptake changed markedly over the day and with CO 2 concentration. Leakage (CO 2 efflux : Ci uptake) showed pronounced diurnal changes. Our findings do not support a direct CO 2 effect on the carboxylation efficiency of ribulose‐1,5‐bisphosphate carboxylase/oxygenase (RubisCO) but point to a shift in resource allocation among photosynthesis, carbon acquisition, and N 2 fixation under elevated CO 2 levels. The observed increase in photosynthesis and N 2 fixation could have potential biogeochemical implications, as it may stimulate productivity in N‐limited oligotrophic regions and thus provide a negative feedback in rising atmospheric CO 2 levels.
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“Some cyanobacteria grow well with CO 2 enrichment and their increased N 2 fixation may alter ocean biogeochemistry (Fu et al., 2008;Kranz et al., 2009).”
From Effects of ocean acidification on macroalgal communities (2011) · cites this paper as Kranz et al., 2009
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Metadata
- Authors
- Kranz, S. A., Dieter, S., Richter, K.-U., & Rost, B.
- Affiliations
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung (DE)
- Venue
- Limnology and Oceanography
- Publisher
- Wiley
- Published
- 2009-03
- Volume
- 54
- Issue
- 2
- Pages
- 548-559
- ISSN
- 0024-3590 (ISSN-L)
- 1939-5590
- OpenAlex
- W2160696268
- Cited by
- 128
- References
- 46
- Citations by year
- 2026: 2 · 2025: 2 · 2024: 8 · 2023: 6 · 2022: 8 · 2021: 2 · 2020: 3 · 2019: 7 · 2018: 5 · 2017: 9 · 2016: 8 · 2015: 8 · 2014: 12 · 2013: 10 · 2012: 10
- FWCI
- 4.96
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Limnology and Oceanography (publishedVersion)
- Helmholtz-Zentrum für Polar-und Meeresforschung (Alfred-Wegener-Institut) (acceptedVersion)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Photosynthetic Processes and Mechanisms
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine Plankton and Biogeochemistry
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant responses to elevated CO2
- Keywords
- Trichodesmium, carbon acquisition, elevated CO2, diurnal variation, carbonic anhydrase, bicarbonate uptake, nitrogen fixation, Rubisco carboxylation efficiency, CO2 efflux, resource allocation, ocean carbon cycle
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