Impact of bleaching conditions on the components of non-photochemical quenching in the zooxanthellae of a coral

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dc.contributor.author Hill, R
dc.contributor.author Frankart, C
dc.contributor.author Ralph, PJ
dc.date.accessioned 2009-12-21T02:30:16Z
dc.date.issued 2005-08-08
dc.identifier.citation Journal of Experimental Marine Biology and Ecology, 2005, 322 (1), pp. 83 - 92
dc.identifier.issn 0022-0981
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/3818
dc.description.abstract Mass coral bleaching events are a worldwide phenomenon, which generally occur during periods of elevated sea surface temperature and intense sunlight. These conditions result in a decline in photochemical efficiency of symbiotic microalgae (zooxanthellae) which ultimately leads to the expulsion of these symbionts. The physiological mechanism which triggers the release of the zooxanthellae has yet to be adequately determined. Under bleaching conditions, non-photochemical quenching (NPQ) is used to dissipate excess energy from photosystem II (PSII). NPQ was partitioned into three components, (energy dependent quenching [qE], state transition quenching [qT] and photoinhibitory quenching [qI]), based on relaxation kinetics upon addition of 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) and darkening. This investigation revealed that for corals not exposed to bleaching stress, qE was the principle means of energy dissipation (∼60% of the total NPQ). In corals exposed to either high-light (475 μmol photons m-2 s-1 and 25°C) or elevated temperature (225 μmol photons m-2 s -1 and 32°C) treatments, the dominant component of NPQ was qE and the relative proportions did not change during the exposure period (1-8 h). When exposed to bleaching conditions (475 μmol photons m-2 s -1 and 32°C) the contribution of the different components changed after 4 h and the total NPQ increased. At this time, the contribution of qT to the total NPQ significantly increased to equal that of qE (40%), suggesting state transitions become more important under such conditions. Throughout the exposure period in all treatments, no change in the proportion of qI was observed. © 2005 Elsevier B.V. All rights reserved.
dc.language eng
dc.relation.isbasedon 10.1016/j.jembe.2005.02.011
dc.title Impact of bleaching conditions on the components of non-photochemical quenching in the zooxanthellae of a coral
dc.type Journal Article
dc.parent Journal of Experimental Marine Biology and Ecology
dc.journal.volume 1
dc.journal.volume 322
dc.journal.number 1 en_US
dc.publocation Amsterdam, Netherlands en_US
dc.publocation Auckland
dc.identifier.startpage 83 en_US
dc.identifier.endpage 92 en_US
dc.cauo.name DVCRch.Institute for Water & Environmental Resource Mgmnt en_US
dc.conference Verified OK en_US
dc.conference Australian and New Zealand Marketing Academy Conference
dc.for 060205 Marine and Estuarine Ecology (Incl. Marine Ichthyology)
dc.personcode 040568
dc.personcode 890085
dc.percentage 100 en_US
dc.classification.name Marine and Estuarine Ecology (incl. Marine Ichthyology) en_US
dc.classification.type FOR-08 en_US
dc.custom 1.588 en_US
dc.date.activity 2001-12-01
dc.location.activity Auckland
dc.description.keywords Chlorophyll a fluorescence
dc.description.keywords Coral bleaching
dc.description.keywords Energy dependent quenching
dc.description.keywords Photoinhibition
dc.description.keywords Photophosphorylation
dc.description.keywords State transitions
pubs.embargo.period Not known
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
utslib.copyright.status Closed Access
utslib.copyright.date 2015-04-15 12:17:09.805752+10
pubs.consider-herdc true
utslib.collection.history Closed (ID: 3)


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