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Enhanced photoprotection pathways in symbiotic dinoflagellates of shallow-water corals and other cnidarians. | LitMetric

Enhanced photoprotection pathways in symbiotic dinoflagellates of shallow-water corals and other cnidarians.

Proc Natl Acad Sci U S A

Odum School of Ecology and Department of Plant Biology, University of Georgia, Athens, GA 30602, USA.

Published: September 2008

AI Article Synopsis

Article Abstract

Photoinhibition, exacerbated by elevated temperatures, underlies coral bleaching, but sensitivity to photosynthetic loss differs among various phylotypes of Symbiodinium, their dinoflagellate symbionts. Symbiodinium is a common symbiont in many cnidarian species including corals, jellyfish, anemones, and giant clams. Here, we provide evidence that most members of clade A Symbiodinium, but not clades B-D or F, exhibit enhanced capabilities for alternative photosynthetic electron-transport pathways including cyclic electron transport (CET). Unlike other clades, clade A Symbiodinium also undergo pronounced light-induced dissociation of antenna complexes from photosystem II (PSII) reaction centers. We propose these attributes promote survival of most cnidarians with clade A symbionts at high light intensities and confer resistance to bleaching conditions that conspicuously impact deeper dwelling corals that harbor non-clade A Symbiodinium.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2527352PMC
http://dx.doi.org/10.1073/pnas.0805187105DOI Listing

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