Gloeobacter and the implications of a freshwater origin of Cyanobacteria

John A. Raven (Lead / Corresponding author), Patricia Sánchez-Baracaldo

    Research output: Contribution to journalArticlepeer-review


    The earliest branching cyanobacterium, Gloeobacter, exhibits a number of ancestral traits including the lack of thylakoids. It occurs epilithically in microbial mats, both subaerially and submerged in low-salinity habitats. These habitats and the absence of thylakoids are associated with the occurrence of membrane-associated photosynthetic processes in the plasma membrane, possibly limiting the rate of both assembly and reassembly of the oxygen-evolving complex, as well as the photosynthetic rate and in vitro growth rate. These factors interact with the occurrence of Gloeobacter in mats to constrain productivity in nature. Traits found in living Gloeobacter, with the probable time of origin of oxygenic photosynthesis and diversification of cyanobacteria, can be related to the possible role of oxygenic primary productivity and organic carbon burial on land during the early Earth in low-salinity environments around the time of the global oxidation event.

    Original languageEnglish
    Number of pages18
    Early online date7 Apr 2021
    Publication statusE-pub ahead of print - 7 Apr 2021


    • Cyanobacterial mats
    • Global oxidation event
    • Gloeobacter
    • Non-marine habitats
    • Oxygen evolution complex
    • Photosynthesis

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