Efficient CO2 fixation by surface Prochlorococcus in the Atlantic Ocean

Manuela Hartmann, Paola Gomez-Pereira, Carolina Grob, Martin Ostrowski, David J. Scanlan, Mikhail V. Zubkov*

*Corresponding author for this work

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Abstract

Nearly half of the Earth's surface is covered by the ocean populated by the most abundant photosynthetic organisms on the planet - Prochlorococcus cyanobacteria. However, in the oligotrophic open ocean, the majority of their cells in the top half of the photic layer have levels of photosynthetic pigmentation barely detectable by flow cytometry, suggesting low efficiency of CO2 fixation compared with other phytoplankton living in the same waters. To test the latter assumption, CO2 fixation rates of flow cytometrically sorted 14C-labelled phytoplankton cells were directly compared in surface waters of the open Atlantic Ocean (30°S to 30°N). CO2 fixation rates of Prochlorococcus are at least 1.5-2.0 times higher than CO2 fixation rates of the smallest plastidic protists and Synechococcus cyanobacteria when normalised to photosynthetic pigmentation assessed using cellular red autofluorescence. Therefore, our data indicate that in oligotrophic oceanic surface waters, pigment minimisation allows Prochlorococcus cells to harvest plentiful sunlight more effectively than other phytoplankton.

Original languageEnglish
Pages (from-to)2280-2289
Number of pages10
JournalISME Journal
Volume8
Issue number11
DOIs
Publication statusPublished - 25 Nov 2014

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Copyright the Publisher 2014. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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Hartmann, M., Gomez-Pereira, P., Grob, C., Ostrowski, M., Scanlan, D. J., & Zubkov, M. V. (2014). Efficient CO2 fixation by surface Prochlorococcus in the Atlantic Ocean. ISME Journal, 8(11), 2280-2289. https://doi.org/10.1038/ismej.2014.56