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Oxidative stress and quantum yield efficiency in the intertidal seagrass zostera noltii

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dc.contributor.authorSilva, João
dc.contributor.authorBarrote, Isabel
dc.contributor.authorSantos, Rui
dc.date.accessioned2014-01-08T10:02:20Z
dc.date.available2014-01-08T10:02:20Z
dc.date.issued2009
dc.description.abstractWe investigated the combined effects of several environmental stressors in the photosynthetic performance and in the activation of biochemical defense mechanisms in the intertidal seagrass Zostera noltii in Ria Formosa coastal lagoon (southern Portugal). The maximum (Fv/Fm) and the effective (F’v/F’m) quantum use efficiencies of PSII were sampled monthly in both neap and spring tides over one year. Other fluorescence parameters, such as the Stern-Volmer non-photochemical quenching (NPQ) and the novel parameter LNP (which expresses the general decrease in PSII photochemical activity in the light) were derived from quantum use efficiency measurements. Sampling for antioxidant enzymes activity, pigments, soluble protein and malondialdehyde (MDA) was conducted in parallel. Reactive oxygen species (ROS) are formed as a normal part of the metabolism. An increment on ROS formation is a common response to those stresses and can cause several types of damage, namely lipid peroxidation. MDA is a product of the peroxidation of membrane lipids and thus is commonly used as an indicator of oxidative stress. Carotenoids and antioxidant enzymes such as ascorbate peroxidase (APx) are part of the plants’ antioxidative system. Higher content of carotenoids indicate a higher photoprotection and increased activities of ROS scavenging enzymes such as APx are correlated with stress tolerance. The relationships among critical environmental parameters (irradiance, temperature, air exposure), oxidative stress, antioxidative responses and quantum use efficiency in Z. noltii were explored through multifactorial analysis.por
dc.identifier.citationSilva J, Barrote I, Santos R (2009). Oxidative stress and quantum use efficiency in the intertidal seagrass Zostera noltii. Coastal and Estuarine Research Federation’s 20th Biennial International Conference, Portland, EUA.por
dc.identifier.otherAUT: IBA00639; ROS00812;
dc.identifier.urihttp://hdl.handle.net/10400.1/3299
dc.language.isoengpor
dc.peerreviewedyespor
dc.subjectSeagrasspor
dc.subjectZostera noltiipor
dc.subjectOxidative stresspor
dc.subjectChlorophyll fluorescencepor
dc.titleOxidative stress and quantum yield efficiency in the intertidal seagrass zostera noltiipor
dc.typeconference object
dspace.entity.typePublication
oaire.citation.conferencePlacePortland, USApor
oaire.citation.startPageCONTROL ID: 652203
oaire.citation.titleCoastal and Estuarine Research Federation’s 20th Biennial International Conferencepor
person.familyNameSilva
person.familyNameBarrote
person.familyNameSantos
person.givenNameJoão
person.givenNameIsabel
person.givenNameRui
person.identifier82814
person.identifier42560
person.identifier.ciencia-id8216-527E-1BD4
person.identifier.ciencia-id801C-0AE4-B5CA
person.identifier.ciencia-id9B18-444D-2244
person.identifier.orcid0000-0002-7211-1661
person.identifier.orcid0000-0002-0922-0259
person.identifier.orcid0000-0002-7861-4366
person.identifier.ridJ-7874-2013
person.identifier.ridB-4168-2008
person.identifier.scopus-author-id7403023547
person.identifier.scopus-author-id8659654200
person.identifier.scopus-author-id7201375018
rcaap.rightsrestrictedAccesspor
rcaap.typeconferenceObjectpor
relation.isAuthorOfPublication61040b53-b17a-40f6-b42e-f5476a7a6ddb
relation.isAuthorOfPublication8027b4d2-ee8d-4432-be75-7a2342a905a8
relation.isAuthorOfPublication84487ca8-404a-4584-81f0-3662c340d712
relation.isAuthorOfPublication.latestForDiscovery84487ca8-404a-4584-81f0-3662c340d712

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