"Super-quenching" state protects Symbiodinium from thermal stress - Implications for coral bleaching.

Slavov, C; Schrameyer, V; Reus, M; Ralph, PJ; Hill, R; Büchel, C; Larkum, AWD; Holzwarth, AR

"Super-quenching" state protects Symbiodinium from thermal stress - Implications for coral bleaching.

Slavov, C Schrameyer, V Reus, M Ralph, PJ Hill, R Büchel, C Larkum, AWD Holzwarth, AR

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Publisher:: ELSEVIER
Publication Type:: Journal Article
Citation:: Biochim Biophys Acta, 2016, 1857, (6), pp. 840-847
Issue Date:: 2016-06

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Field	Value	Language
dc.contributor.author	Slavov, C
dc.contributor.author	Schrameyer, V
dc.contributor.author	Reus, M
dc.contributor.author	Ralph, PJ
dc.contributor.author	Hill, R
dc.contributor.author	Büchel, C
dc.contributor.author	Larkum, AWD
dc.contributor.author	Holzwarth, AR
dc.date.accessioned	2023-04-25T05:47:27Z
dc.date.available	2016-02-05
dc.date.available	2023-04-25T05:47:27Z
dc.date.issued	2016-06
dc.identifier.citation	Biochim Biophys Acta, 2016, 1857, (6), pp. 840-847
dc.identifier.issn	0006-3002
dc.identifier.issn	1878-2434
dc.identifier.uri	http://hdl.handle.net/10453/170081
dc.description.abstract	The global rise in sea surface temperatures causes regular exposure of corals to high temperature and high light stress, leading to worldwide disastrous coral bleaching events (loss of symbiotic dinoflagellates (Symbiodinium) from reef-building corals). Our picosecond chlorophyll fluorescence experiments on cultured Symbiodinium clade C cells exposed to coral bleaching conditions uncovered the transformations of the alga's photosynthetic apparatus (PSA) that activate an extremely efficient non-photochemical "super-quenching" mechanism. The mechanism is associated with a transition from an initially heterogeneous photosystem II (PSII) pool to a homogeneous "spillover" pool, where nearly all excitation energy is transferred to photosystem I (PSI). There, the inherently higher stability of PSI and high quenching efficiency of P(700)(+) allow dumping of PSII excess excitation energy into heat, resulting in almost complete cessation of photosynthetic electron transport (PET). This potentially reversible "super-quenching" mechanism protects the PSA against destruction at the cost of a loss of photosynthetic activity. We suggest that the inhibition of PET and the consequent inhibition of organic carbon production (e.g. sugars) in the symbiotic Symbiodinium provide a trigger for the symbiont expulsion, i.e. bleaching.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	ELSEVIER
dc.relation.ispartof	Biochim Biophys Acta
dc.relation.isbasedon	10.1016/j.bbabio.2016.02.002
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	02 Physical Sciences, 06 Biological Sciences
dc.subject.mesh	Animals
dc.subject.mesh	Anthozoa
dc.subject.mesh	Chlorophyll
dc.subject.mesh	Dinoflagellida
dc.subject.mesh	Electron Transport
dc.subject.mesh	Kinetics
dc.subject.mesh	Light
dc.subject.mesh	Luminescent Measurements
dc.subject.mesh	Microscopy, Electron, Transmission
dc.subject.mesh	Models, Biological
dc.subject.mesh	Oxidation-Reduction
dc.subject.mesh	Photosynthesis
dc.subject.mesh	Photosystem I Protein Complex
dc.subject.mesh	Photosystem II Protein Complex
dc.subject.mesh	Stress, Physiological
dc.subject.mesh	Symbiosis
dc.subject.mesh	Temperature
dc.subject.mesh	Thylakoids
dc.subject.mesh	Time Factors
dc.subject.mesh	Thylakoids
dc.subject.mesh	Animals
dc.subject.mesh	Anthozoa
dc.subject.mesh	Dinoflagellida
dc.subject.mesh	Chlorophyll
dc.subject.mesh	Photosystem I Protein Complex
dc.subject.mesh	Photosystem II Protein Complex
dc.subject.mesh	Microscopy, Electron, Transmission
dc.subject.mesh	Luminescent Measurements
dc.subject.mesh	Temperature
dc.subject.mesh	Symbiosis
dc.subject.mesh	Photosynthesis
dc.subject.mesh	Electron Transport
dc.subject.mesh	Oxidation-Reduction
dc.subject.mesh	Kinetics
dc.subject.mesh	Light
dc.subject.mesh	Models, Biological
dc.subject.mesh	Time Factors
dc.subject.mesh	Stress, Physiological
dc.subject.mesh	Animals
dc.subject.mesh	Anthozoa
dc.subject.mesh	Chlorophyll
dc.subject.mesh	Dinoflagellida
dc.subject.mesh	Electron Transport
dc.subject.mesh	Kinetics
dc.subject.mesh	Light
dc.subject.mesh	Luminescent Measurements
dc.subject.mesh	Microscopy, Electron, Transmission
dc.subject.mesh	Models, Biological
dc.subject.mesh	Oxidation-Reduction
dc.subject.mesh	Photosynthesis
dc.subject.mesh	Photosystem I Protein Complex
dc.subject.mesh	Photosystem II Protein Complex
dc.subject.mesh	Stress, Physiological
dc.subject.mesh	Symbiosis
dc.subject.mesh	Temperature
dc.subject.mesh	Thylakoids
dc.subject.mesh	Time Factors
dc.title	"Super-quenching" state protects Symbiodinium from thermal stress - Implications for coral bleaching.
dc.type	Journal Article
utslib.citation.volume	1857
utslib.location.activity	Netherlands
utslib.for	02 Physical Sciences
utslib.for	06 Biological Sciences
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Provost
pubs.organisational-group	/University of Technology Sydney/Provost/Jumbunna
pubs.organisational-group	/University of Technology Sydney/Strength - C3 - Climate Change Cluster
utslib.copyright.status	closed_access	*
dc.date.updated	2023-04-25T05:47:25Z
pubs.issue	6
pubs.publication-status	Published
pubs.volume	1857
utslib.citation.issue	6

Abstract:

The global rise in sea surface temperatures causes regular exposure of corals to high temperature and high light stress, leading to worldwide disastrous coral bleaching events (loss of symbiotic dinoflagellates (Symbiodinium) from reef-building corals). Our picosecond chlorophyll fluorescence experiments on cultured Symbiodinium clade C cells exposed to coral bleaching conditions uncovered the transformations of the alga's photosynthetic apparatus (PSA) that activate an extremely efficient non-photochemical "super-quenching" mechanism. The mechanism is associated with a transition from an initially heterogeneous photosystem II (PSII) pool to a homogeneous "spillover" pool, where nearly all excitation energy is transferred to photosystem I (PSI). There, the inherently higher stability of PSI and high quenching efficiency of P(700)(+) allow dumping of PSII excess excitation energy into heat, resulting in almost complete cessation of photosynthetic electron transport (PET). This potentially reversible "super-quenching" mechanism protects the PSA against destruction at the cost of a loss of photosynthetic activity. We suggest that the inhibition of PET and the consequent inhibition of organic carbon production (e.g. sugars) in the symbiotic Symbiodinium provide a trigger for the symbiont expulsion, i.e. bleaching.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/170081