Repair machinery of symbiotic photosynthesis as the primary target of heat stress for reef-building corals

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 thr...

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Bibliographic Details
Published in:Plant and cell physiology 2004-02, Vol.45 (2), p.251-255
Main Authors: Takahashi, S. (Ryukyu Univ., Nishihara, Okinawa (Japan). Faculty of Science), Nakamura, T, Sakamizu, M, van Woesik, R, Yamasaki, H
Format: Article
Language:English
Subjects:
Acropora digitifera
Algae
Animals
Anthozoa - cytology
Anthozoa - metabolism
Anthozoa - radiation effects
BLEACHING
COELENTERATA
Eukaryota - cytology
Eukaryota - metabolism
Eukaryota - radiation effects
Fv/Fm
HEAT STRESS
Keywords: Coral bleaching — Heat — Photoinhibition — Repair — Symbiosis — Zooxanthellae
Marine
maximum quantum yield of photosystem II
PAM
Photic Stimulation
Photobleaching - radiation effects
Photosynthesis - physiology
Photosynthesis - radiation effects
photosystem II
Photosystem II Protein Complex - metabolism
Photosystem II Protein Complex - radiation effects
PSII
pulse amplitude modulation
reactive oxygen species
Regeneration - physiology
Regeneration - radiation effects
ROS
Stress, Physiological - metabolism
SYMBIOSIS
Symbiosis - physiology
Symbiosis - radiation effects
Temperature
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Summary: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.
ISSN:0032-0781
1471-9053
DOI:10.1093/pcp/pch028