Journal Article

Repair Machinery of Symbiotic Photosynthesis as the Primary Target of Heat Stress for Reef-Building Corals

Shunichi Takahashi, Takashi Nakamura, Manabu Sakamizu, Robert van Woesik and Hideo Yamasaki

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 45, issue 2, pages 251-255
Published in print February 2004 | ISSN: 0032-0781
Published online February 2004 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pch028
Repair Machinery of Symbiotic Photosynthesis as the Primary Target of Heat Stress for Reef-Building Corals

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In a coral-algae symbiotic system, heat-dependent photoinhibition of photosystem II (PSII) leads to coral bleaching. When the reef-building coral Acropora digitifera was exposed to light, a moderate increase of temperature induced coral bleaching through photobleaching of algal pigments, but not through expulsion of symbiotic algae. Monitoring of PSII photoinhibition revealed that heat-dependent photoinhibition was ascribed to inhibition of the repair of photodamaged PSII, and heat susceptibility of the repair machinery varied among coral species. We conclude that the efficiency of the photosynthesis repair machinery determines the bleaching susceptibility of coral species under elevated seawater temperatures.

Keywords: Keywords: Coral bleaching — Heat — Photoinhibition — Repair — Symbiosis — Zooxanthellae.; Abbreviations: Fv/Fm, maximum quantum yield of photosystem II; PAM, pulse amplitude modulation; PSII, photosystem II; ROS, reactive oxygen species.

Journal Article.  3154 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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