IMIS

Publications | Institutes | Persons | Datasets | Projects | Maps
[ report an error in this record ]basket (1): add | show Print this page

one publication added to basket [333863]
Carbon isotope evidence for the global physiology of Proterozoic cyanobacteria
Hurley, S.J.; Wing, B.A.; Jasper, C.E.; Hill, N.C.; Cameron, J.C. (2021). Carbon isotope evidence for the global physiology of Proterozoic cyanobacteria. Science Advances 7(2): eabc8998. https://dx.doi.org/10.1126/sciadv.abc8998
In: Science Advances. AAAS: New York. e-ISSN 2375-2548, more
Peer reviewed article  

Available in  Authors 

Authors  Top 
  • Hurley, S.J.
  • Wing, B.A.
  • Jasper, C.E.
  • Hill, N.C.
  • Cameron, J.C.

Abstract
    Ancestral cyanobacteria are assumed to be prominent primary producers after the Great Oxidation Event [≈2.4 to 2.0 billion years (Ga) ago], but carbon isotope fractionation by extant marine cyanobacteria (α-cyanobacteria) is inconsistent with isotopic records of carbon fixation by primary producers in the mid-Proterozoic eon (1.8 to 1.0 Ga ago). To resolve this disagreement, we quantified carbon isotope fractionation by a wild-type planktic β-cyanobacterium (Synechococcus sp. PCC 7002), an engineered Proterozoic analog lacking a CO2-concentrating mechanism, and cyanobacterial mats. At mid-Proterozoic pH and pCO2 values, carbon isotope fractionation by the wild-type β-cyanobacterium is fully consistent with the Proterozoic carbon isotope record, suggesting that cyanobacteria with CO2-concentrating mechanisms were apparently the major primary producers in the pelagic Proterozoic ocean, despite atmospheric CO2 levels up to 100 times modern. The selectively permeable microcompartments central to cyanobacterial CO2-concentrating mechanisms (“carboxysomes”) likely emerged to shield rubisco from O2 during the Great Oxidation Event.

All data in the Integrated Marine Information System (IMIS) is subject to the VLIZ privacy policy Top | Authors