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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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Self-citationHutchins, D. A., Fu, F.-X., Zhang, Y., Warner, M. E., Feng, Y., Portune, K., Bernhardt, P. W., & Mulholland, M. R. (2007) · Limnology and Oceanography · doi:10.4319/lo.2007.52.4.1293 · Cited by 445
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O’Neil, J. M., Davis, T. W., Burford, M. A., & Gobler, C. J. (2012) · Harmful Algae · doi:10.1016/j.hal.2011.10.027 · Cited by 2,225
Guide to best practices for ocean acidification research and data reporting
Riebesell, U., Fabry, V. J., Hansson, L., & Gattuso, J. (2011) · Helmholtz Centre for Ocean Research Kiel (GEOMAR) · doi:10.2777/66906 · Cited by 925
How rising CO2 and global warming may stimulate harmful cyanobacterial blooms
Visser, P., Verspagen, J. M. H., Sandrini, G., Stal, L. J., Matthijs, H. C. P., Davis, T. W., Paerl, H. W., & Huisman, J. (2016) · Harmful Algae · doi:10.1016/j.hal.2015.12.006 · Cited by 680
Harvey, B. P., Gwynn‐Jones, D., & Moore, P. J. (2013) · Ecology and Evolution · doi:10.1002/ece3.516 · Cited by 515
Rost, B., Zondervan, I., & Wolf-Gladrow, D. A. (2008) · Marine Ecology Progress Series · doi:10.3354/meps07776 · Cited by 373
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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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