Created 14/09/2021
14 Sep
2021

Marine Synechococcus picocyanobacteria: Light utilization across latitudes , Christophe Six, Morgane Ratin, Dominique Marie, Erwan Corre, PNAS September 21, 2021 118 (38) e2111300118; https://doi.org/10.1073/pnas.2111300118,

A research group from the Biological Station of Roscoff has unveiled important evolutionary mechanisms that have allowed the most widely distributed cyanobacterium on Earth, Synechococcus, to colonize the oceans from the equator to the polar circles. The study shows that tropical Synechococcus are very cold sensitive but that, at high temperature, they can grow very rapidly by increasing considerably their photosynthetic activity. Subpolar Synechococcus grow more slowly but are able to cope with temperature lower than 8°C. The Roscoff researchers have shown that, to do so, they use a photoprotective protein called OCP which allows them to finely regulate photosynthesis at low temperature. The study demonstrates that temperature has been a major driver of the evolution of this photosynthetic protein in the oceans, suggesting that photosynthesis regulation can be a bottleneck for adapting to global warming.

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"The complex pigmentation of marine Synechococcus allows adaptation to different temperature niches (Gel Filtration separation of soluble extract).

Christophe Six, Associate professor, Sorbonne University
Group "Ecology of Marine Plankton" (ECOMAP)
Station Biologique de Roscoff
Website :  https://www.sb-roscoff.fr/en/six-christophe/386