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The effects of epiphytes on light harvesting and antioxidant responses in the seagrass posidonia oceanica

2013Conference object Open access
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dc.contributor.authorCosta, Monya
dc.contributor.authorSilva, João
dc.contributor.authorOlivé, Irene
dc.contributor.authorBarrote, Isabel
dc.contributor.authorAlexandre, Ana
dc.contributor.authorAlbano, Sílvia
dc.contributor.authorSantos, Rui
dc.date.accessioned2014-01-10T10:58:50Z
dc.date.available2014-01-10T10:58:50Z
dc.date.issued2013
dc.description.abstractPosidonia oceanica (L.) Delile is a subtidal seagrass whose leaves are commonly colonized by epiphytes. Epiphytes pose physical barriers to light penetration within the leaves, with possible significant impacts on photosynthesis. Furthermore, epiphytes can indirectly be responsible for leaf chlorosis, necrosis and senescence which are known to be related with the increase of oxygen reactive species (ROS) levels, potentially leading to oxidative stress. The aim of this work was to investigate in situ (i) the effect of epiphytes on the composition and balance of light harvesting pigments in leaves of the naturally growing seagrass P. oceanica, and (ii) evaluate differences in antioxidant responses. Epiphytized and non-epiphytized plants were analyzed to establish potential photosynthetic pigment roleshift between light harvesting and photoprotection functions. The experiments were carried out in Cabo de Gata Natural Park, southern Spain, where epiphytized and non-epiphytized plants can be found at identical depths and light exposure. The results showed that both O2 evolution rate along the day and chlorophyll a/b ratio were higher in non-epiphytized plants, indicating a negative effect of epiphytes on photosynthesis and light harvesting. Although under high irradiance (at solar noon) the xanthophyll cycle was activated in both epiphytized and non-epiphytized leaves, the de-epoxidation-ratio (AZ/VAZ) was lower in epiphytized leaves, due to light attenuation by epiphytes. The antioxidant capacity (TEAC and ORAC essays) and the activity of the antioxidant enzymes ascorbate peroxidase and dehydroascorbate were higher in epiphytized plants, showing that epiphytes can also be a potential source of oxidative stress to P. oceanica. Our results show that despite the light attenuation effect, leaf colonization by epiphytes can also be potentially stressful and reduces plant productivity.por
dc.identifier.citationCosta MM, Silva J, Olivé I, Barrote I, Alexandre A, Albano S, Santos R (2013) The effects of epiphytes on light harvesting and antioxidant responses in the seagrass Posidonia oceanica. Coastal and Estuarine Research Federation’s 21st Biennial Conference, San Diego, California, EUA, p47por
dc.identifier.otherAUT: IBA00639; ROS00812;
dc.identifier.urihttp://hdl.handle.net/10400.1/3328
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherCoastal & Estuarine Research Federationpor
dc.relation.publisherversionhttp://www.sgmeet.com/cerf2013/por
dc.subjectEpiphytespor
dc.subjectLight harvestingpor
dc.subjectAntioxidantspor
dc.subjectSeagrasspor
dc.subjectPosidonia oceanicapor
dc.subjectOxygen reactive speciespor
dc.subjectOxidative stresspor
dc.subjectPhotosynthetic pigmentspor
dc.subjectXanthophyll cyclepor
dc.subjectAntioxidant enzymespor
dc.titleThe effects of epiphytes on light harvesting and antioxidant responses in the seagrass posidonia oceanicapor
dc.typeconference object
dspace.entity.typePublication
oaire.citation.conferencePlaceSan Diego, California, USApor
oaire.citation.endPage48por
oaire.citation.startPage47por
oaire.citation.title21st Biennial Conference of the Coastal and Estuarine Research Federationpor
person.familyNameSilva
person.familyNameOlivé
person.familyNameBarrote
person.familyNameAlexandre
person.familyNameSantos
person.givenNameJoão
person.givenNameIrene
person.givenNameIsabel
person.givenNameAna
person.givenNameRui
person.identifier82814
person.identifier42560
person.identifier.ciencia-id8216-527E-1BD4
person.identifier.ciencia-id801C-0AE4-B5CA
person.identifier.ciencia-idA711-4AF6-8F36
person.identifier.ciencia-id9B18-444D-2244
person.identifier.orcid0000-0002-7211-1661
person.identifier.orcid0000-0002-4865-923X
person.identifier.orcid0000-0002-0922-0259
person.identifier.orcid0000-0001-7164-1487
person.identifier.orcid0000-0002-7861-4366
person.identifier.ridJ-7874-2013
person.identifier.ridJ-3922-2013
person.identifier.ridB-4168-2008
person.identifier.scopus-author-id7403023547
person.identifier.scopus-author-id16242114500
person.identifier.scopus-author-id8659654200
person.identifier.scopus-author-id35836826900
person.identifier.scopus-author-id7201375018
rcaap.rightsopenAccesspor
rcaap.typeconferenceObjectpor
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