Light-induced dissociation of antenna complexes in the symbionts of scleractinian corals correlates with sensitivity to coral bleaching

0390056 - MBÚ 2013 RIV US eng J - Článek v odborném periodiku
Hill, R. - Larkum, A. W. D. - Prášil, Ondřej - Kramer, D. M. - Szabó, M. - Kumar, V. - Ralph, P. J.
Light-induced dissociation of antenna complexes in the symbionts of scleractinian corals correlates with sensitivity to coral bleaching.
Coral Reefs. Roč. 31, č. 4 (2012), s. 963-975. ISSN 0722-4028. E-ISSN 1432-0975
Grant CEP: GA AV ČR IAA601410907; GA MŠMT(CZ) ED2.1.00/03.0110
Institucionální podpora: RVO:61388971
Klíčová slova: Photoprotection * Non-photochemical quenching * Xanthophyll cycle
Kód oboru RIV: EE - Mikrobiologie, virologie
Impakt faktor: 3.662, rok: 2012

Elevated temperatures in combination with moderate to high irradiance are known to cause bleaching events in scleractinian corals, characterised by damage to photosystem II (PSII). Photoprotective mechanisms of the symbiont can reduce the excitation pressure impinging upon PSII. In the bleaching sensitive species, Acropora millepora and Pocillopora damicornis, high light alone induced photoprotection through the xanthophyll cycle, increased content of the antioxidant carotenoid, beta-carotene, as well as the dissociation of the light-harvesting chlorophyll complexes. The evidence is compatible with either the membrane-bound chlorophyll a-chlorophyll c (2)-peridinin-protein (acpPC) complex or the peripheral peridinin-chlorophyll-protein complex, or both, disconnecting from PSII under high light. The acpPC complex potentially showed a state transition response with redistribution towards photosystem I to reduce PSII over-excitation. This apparent acpPC dissociation/reassociation was promoted by the addition of the xanthophyll cycle inhibitor, dithiothreitol, under high irradiance
Trvalý link: http://hdl.handle.net/11104/0218964