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Plant and Cell Physiology, 2004, Vol. 45, No. 2 251-255
© 2004 Oxford University Press

Short Communication

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

Shunichi Takahashi1, Takashi Nakamura, Manabu Sakamizu, Robert van Woesik2 and Hideo Yamasaki3,4

Faculty of Science, University of the Ryukyus, Okinawa, 903-0213 Japan

Abstract

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.

Footnotes

1 Present address: National Institute of Basic Biology, Okazaki, Aichi, 444-8585 Japan.

2 Present address: Department of Biological Sciences, Florida Institute of Technology, Melbourne, FL 32901-6988, U.S.A.

3 Present address: Center of Molecular Biosciences (COMB), University of the Ryukyus, Okinawa, 903-0213 Japan.

4 Corresponding author: E-mail,yamasaki{at}comb.u-ryukyu.ac.jp; Fax, +81-98-895-8944.


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