High pCO2-induced exopolysaccharide-rich ballasted aggregates of planktonic cyanobacteria could explain Paleoproterozoic carbon burial

Kamennaya, Nina A.; Zemla, Marcin; Mahoney, Laura; Chen, Liang; Holman, Elizabeth; Holman, Hoi -Ying; Auer, Manfred; Ajo-Franklin, Caroline M.; Jansson, Christer

doi:10.1038/s41467-018-04588-9

Title: High pCO₂-induced exopolysaccharide-rich ballasted aggregates of planktonic cyanobacteria could explain Paleoproterozoic carbon burial

Journal Article · 28 May 2018 · Nature Communications

DOI: https://doi.org/10.1038/s41467-018-04588-9 · OSTI ID:1441217

Kamennaya, Nina A. ^[1]; Zemla, Marcin ^[2]; Mahoney, Laura ^[2]; Chen, Liang ^[2]; Holman, Elizabeth ^[3]; Holman, Hoi -Ying ^[2]; Auer, Manfred ^[2];

^[2]; Jansson, Christer ^[4]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Tel Aviv Univ., Tel Aviv (Israel)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Here, the contribution of planktonic cyanobacteria to burial of organic carbon in deep-sea sediments before the emergence of eukaryotic predators ~1.5 Ga has been considered negligible owing to the slow sinking speed of their small cells. However, global, highly positive excursion in carbon isotope values of inorganic carbonates ~2.22–2.06 Ga implies massive organic matter burial that had to be linked to oceanic cyanobacteria. Here to elucidate that link, we experiment with unicellular planktonic cyanobacteria acclimated to high partial CO₂ pressure (pCO₂) representative of the early Paleoproterozoic. We find that high pCO₂ boosts generation of acidic extracellular polysaccharides (EPS) that adsorb Ca and Mg cations, support mineralization, and aggregate cells to form ballasted particles. The down flux of such self-assembled cyanobacterial aggregates would decouple the oxygenic photosynthesis from oxidative respiration at the ocean scale, drive export of organic matter from surface to deep ocean and sustain oxygenation of the planetary surface.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Nanoscale Control of Geologic CO2 (NCGC); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231; AC05-76RL01830

OSTI ID:: 1441217

Report Number(s):: PNNL-SA--131327; PII: 4588

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 9; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Strategies to Obtain Designer Polymers Based on Cyanobacterial Extracellular Polymeric Substances (EPS) Pereira, Sara B.; Sousa, Aureliana; Santos, Marina International Journal of Molecular Sciences, Vol. 20, Issue 22 https://doi.org/10.3390/ijms20225693	journal	November 2019
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Title: High pCO₂-induced exopolysaccharide-rich ballasted aggregates of planktonic cyanobacteria could explain Paleoproterozoic carbon burial