[en] Deciphering the fossil record of cyanobacteria is crucial to understand their role in the chemical and biological evolution of the early Earth. They profoundly modified the redox conditions of early ecosystems more than 2.4 Ga ago, the age of the Great Oxidation Event (GOE), and provided the ancestor of the chloroplast by endosymbiosis, leading the diversification of photosynthetic eukaryotes. Here, we analyze the morphology, ultrastructure, chemical composition, and metals distribution of Polysphaeroides filiformis from the 1040–1006 Ma Mbuji-Mayi Supergroup (DR Congo). We evidence trilaminar and bilayered ultrastructures for the sheath and the cell wall, respectively, and the preservation of Ni-tetrapyrrole moieties derived from chlorophyll in intracellular inclusions. This approach allows an unambiguous interpretation of P. filiformis as a branched and multiseriate photosynthetic cyanobacterium belonging to the family of Stigonemataceae. It also provides a possible minimum age for the emergence of multiseriate true branching nitrogen-fixing and probably heterocytous cyanobacteria.
Research center :
Synchrotron Soleil, 91190 Saint-Aubin – BP 48, France ESRF-The European Synchrotron, 38000 Grenoble, France Paul Scherrer Institut, Swiss Light Source, 5232 Villigen PSI, Switzerland CAREM - Cellule d'Appui à la Recherche et à l'Enseignement en Microscopie - ULiège [BE] Unité Matériaux et Transformations (UMR CNRS 8207), Université Lille 1 - Sciences et Technologies, 59650 Villeneuve d'Ascq, France
FP7 - 308074 - ELITE - Early Life Traces, Evolution, and Implications for Astrobiology
Funders :
ERC - European Resuscitation Council [BE] F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE] BELSPO - Belgian Federal Science Policy Office [BE] ULiège - Université de Liège [BE] ERC - European Research Council [BE] Union Européenne [BE]
Funding number :
B2/212/PI/PORTAL; FP7/308074; EOS ET-Home grant 30442502
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