Abstract
AbstractFar-red absorbing chlorophylls are constitutively present as Chldin the cyanobacteriumAcaryochloris marina, or dynamically expressed by synthesis of Chlfand red-shifted phycobilins via far-red light photoacclimation in a range of cyanobacteria, which enables them to use near-infrared-radiation (NIR) for oxygenic photosynthesis. While the biochemistry and molecular physiology of Chlf-containing cyanobacteria has been unraveled in culture studies, their ecological significance remains unexplored and no data on theirin situactivity exist. With a novel combination of hyperspectral imaging, confocal laser scanning microscopy, and nanoparticle-based O2imaging, we demonstrate substantial NIR-driven oxygenic photosynthesis by endolithic, Chlf-containing cyanobacteria within natural beachrock biofilms that are widespread on (sub)tropical coastlines. This indicates an important role of NIR-driven oxygenic photosynthesis in primary production of endolithic and other shaded habitats.Impact statementCyanobacteria with chlorophyllfshow substantial near-infrared radiation-driven photosynthesis in intertidal habitats.
Publisher
Cold Spring Harbor Laboratory
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