Increased rate of D1 repair in coral symbionts during bleaching is insufficient to counter accelerated photo-inactivation

Hill, R; Brown, CM; DeZeeuw, K; Campbell, DA; Ralph, PJ

Increased rate of D1 repair in coral symbionts during bleaching is insufficient to counter accelerated photo-inactivation

Hill, R

Brown, CM DeZeeuw, K Campbell, DA

Ralph, PJ

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Publication Type:: Journal Article
Citation:: Limnology and Oceanography, 2011, 56 (1), pp. 139 - 146
Issue Date:: 2011-01-01

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Field	Value	Language
dc.contributor.author	Hill, R https://orcid.org/0000-0002-4623-1563	en_US
dc.contributor.author	Brown, CM	en_US
dc.contributor.author	DeZeeuw, K	en_US
dc.contributor.author	Campbell, DA https://orcid.org/0000-0001-8996-5463	en_US
dc.contributor.author	Ralph, PJ https://orcid.org/0000-0002-3103-7346	en_US
dc.date.issued	2011-01-01	en_US
dc.identifier.citation	Limnology and Oceanography, 2011, 56 (1), pp. 139 - 146	en_US
dc.identifier.issn	0024-3590	en_US
dc.identifier.uri	http://hdl.handle.net/10453/18058
dc.description.abstract	We dissect the primary photo-inactivation and the counteracting metabolic repair rates in fragments of the scleractinian coral, Pocillopora damicornis, subjected to a combined stress of a shift to elevated temperature (from 26°C to 32°C) and increased light (from 200 μmol photons m-2 s-1 to 400 μmol photons m-2 s-1) to induce bleaching. During the bleaching treatment the dinoflagellate symbionts showed a 5.5-fold acceleration in their photosystem II (PSII) repair rate constant, demonstrating that they maintain strong metabolic capacity to clear and replace photo-damaged D1 protein at the elevated temperature and light conditions. Nevertheless, the symbionts concurrently suffered a seven-fold increase in the rate constant for PSII photo-inactivation. This rapid photo-inactivation exceeded the PSII repair capacity, therefore tipping the symbionts, and by implication the symbiosis, into net photo-inhibition. Increased photo-inactivation in hospite, rather than an inhibition of PSII repair, is the principle trigger for net photo-inhibition under bleaching conditions. © 2011, by the American Society of Limnology and Oceanography, Inc.	en_US
dc.relation.ispartof	Limnology and Oceanography	en_US
dc.relation.isbasedon	10.4319/lo.2011.56.1.0139	en_US
dc.subject.classification	Marine Biology & Hydrobiology	en_US
dc.title	Increased rate of D1 repair in coral symbionts during bleaching is insufficient to counter accelerated photo-inactivation	en_US
dc.type	Journal Article
utslib.citation.volume	1	en_US
utslib.citation.volume	56	en_US
utslib.for	0602 Ecology	en_US
utslib.for	04 Earth Sciences	en_US
utslib.for	05 Environmental Sciences	en_US
utslib.for	06 Biological Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Strength - C3 - Climate Change Cluster
utslib.copyright.status	open_access
pubs.issue	1	en_US
pubs.publication-status	Published	en_US
pubs.volume	56	en_US

Abstract:

We dissect the primary photo-inactivation and the counteracting metabolic repair rates in fragments of the scleractinian coral, Pocillopora damicornis, subjected to a combined stress of a shift to elevated temperature (from 26°C to 32°C) and increased light (from 200 μmol photons m-2 s-1 to 400 μmol photons m-2 s-1) to induce bleaching. During the bleaching treatment the dinoflagellate symbionts showed a 5.5-fold acceleration in their photosystem II (PSII) repair rate constant, demonstrating that they maintain strong metabolic capacity to clear and replace photo-damaged D1 protein at the elevated temperature and light conditions. Nevertheless, the symbionts concurrently suffered a seven-fold increase in the rate constant for PSII photo-inactivation. This rapid photo-inactivation exceeded the PSII repair capacity, therefore tipping the symbionts, and by implication the symbiosis, into net photo-inhibition. Increased photo-inactivation in hospite, rather than an inhibition of PSII repair, is the principle trigger for net photo-inhibition under bleaching conditions. © 2011, by the American Society of Limnology and Oceanography, Inc.

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http://hdl.handle.net/10453/18058