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Photosynthetic responses of Haalophila stipulacea to a light gradient. I. In situ energy partitioning of non-photochemical quenching

2009Journal article Open access
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dc.contributor.authorRuncie, John W.
dc.contributor.authorPaulo, Diogo
dc.contributor.authorSantos, Rui
dc.contributor.authorSharon, Yoni
dc.contributor.authorBeer, Sven
dc.contributor.authorSilva, João
dc.date.accessioned2018-12-07T14:58:34Z
dc.date.available2018-12-07T14:58:34Z
dc.date.issued2009
dc.description.abstractThe quantum yield of photosystem II (phi(II), also termed Delta F/F-m' or F-v/F-m in light- or dark-acclimated plants, respectively) of the tropical seagrass Halophila stipulacea was measured in situ using modulated fluorescence techniques over diel periods at a range of depths. Photosynthetic electron transport rates (ETRs), as derived from phi(II) values at specific ambient photosynthetically available radiation (PAR) irradiances, increased in direct proportion to increasing irradiance in the morning and, at shallow sites (7 to 10 m), reached saturating rates and then declined in the afternoon with lower PAR-specific ETRs. On the other hand, plants at 32 to 33 m showed no saturation even at midday, and the percentage reduction in PAR-specific afternoon ETRs was less than that of the shallower plants. The use of an automated shutter in the measuring device enabled non-photochemical quenching due to down-regulation and basal intrinsic non-radiative decay to be distinguished. While midday values of down-regulation were lower in deeper water, basal intrinsic non-radioactive decay remained fairly constant at 30 to 40% at all depths, with more variation in shallow waters. The maximal phi(II) (i.e. F-v/F-m) reached similar values at midnight regardless of depth. H. stipulacea acclimates to the widely varying irradiances across this depth gradient by regularly modulating down-regulation-based non-photochemical quenching processes, while dissipating a large proportion of light energy through intrinsic decay regardless of depth.
dc.identifier.doi10.3354/ab00164
dc.identifier.issn1864-7790
dc.identifier.issn1864-7782
dc.identifier.urihttp://hdl.handle.net/10400.1/12096
dc.language.isoeng
dc.peerreviewedyes
dc.publisherInter-Research
dc.subjectModulated pam fluorometry
dc.subjectHalophila-stipulacea
dc.subjectChlorophyll-fluorescence
dc.subjectElectron-transport
dc.subjectThalassia-testudinum
dc.subjectPosidonia-australis
dc.subjectQuantum yield
dc.subjectRed-sea
dc.subjectSeagrasses
dc.subjectRates
dc.titlePhotosynthetic responses of Haalophila stipulacea to a light gradient. I. In situ energy partitioning of non-photochemical quenching
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceIntuniv Inst Marine Sci, Eilat, ISRAEL
oaire.citation.endPage152
oaire.citation.issue01-fev
oaire.citation.startPage143
oaire.citation.titleAquatic Biology
oaire.citation.title8Th International Workshop of the Group for Aquatic Primary Productivity/ Seminar on Gross and Net Primary Productivity
oaire.citation.volume7
person.familyNamePaulo
person.familyNameSantos
person.familyNameSilva
person.givenNameDiogo
person.givenNameRui
person.givenNameJoão
person.identifier42560
person.identifier82814
person.identifier.ciencia-idD31B-CCC9-EDBB
person.identifier.ciencia-id9B18-444D-2244
person.identifier.ciencia-id8216-527E-1BD4
person.identifier.orcid0000-0001-9061-6850
person.identifier.orcid0000-0002-7861-4366
person.identifier.orcid0000-0002-7211-1661
person.identifier.ridM-7522-2013
person.identifier.ridB-4168-2008
person.identifier.ridJ-7874-2013
person.identifier.scopus-author-id7201375018
person.identifier.scopus-author-id7403023547
rcaap.rightsopenAccess
rcaap.typearticle
relation.isAuthorOfPublication0d949505-04b6-477b-851b-a9f27ae0f033
relation.isAuthorOfPublication84487ca8-404a-4584-81f0-3662c340d712
relation.isAuthorOfPublication61040b53-b17a-40f6-b42e-f5476a7a6ddb
relation.isAuthorOfPublication.latestForDiscovery84487ca8-404a-4584-81f0-3662c340d712

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