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Biochemical and photochemical feedbacks of acute Cd toxicity in Juncus acutus seedlings: The role of non-functional Cd-chlorophylls

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dc.contributor.authorSantos, D.
dc.contributor.authorDuarte, Bernardo
dc.contributor.authorCaçador, Isabel
dc.date.accessioned2020-01-19T18:17:12Z
dc.date.available2020-01-19T18:17:12Z
dc.date.issued2015
dc.description.abstractThe increasing metal pollution in salt marshes and its influence on the plants that inhabit these ecosystems, has become a major concern with serious implications on the species establishment. Juncus acutus is a highly common halophyte specie in Portuguese marshes. Seeds from his specie were exposed to a range of different Cd concentrations (0.05, 0.1, 0.5 and 1 μM) in order to evaluate the effects of acute Cd stress on seed germination and growth as well as on seedling pigment composition, photosynthetic apparatus and oxidative stress biomarkers. Seedling length was higher than in control in every Cd treatment, however biomass showed a decrease. It was also observed that increasing Cd treatments, lead to a proportional increase in the Cd tissue concentration. Also the Cd-substituted chlorophylls showed an increase with increasing Cd doses that were applied. This substitution results in a non-functional chlorophyll molecule, highly unstable under moderate light intensities which inevitably reduces the efficiency of the LHC II. As consequence, there was a decrease in the use-efficiency of the harvested energy, leading to a decay in the photosynthetic capacity and energy accumulation, which was dissipated as heat. As for the antioxidant enzymes, SOD and APX presented higher activity, responding to increasing cadmium concentrations. Thus, becomes evident that Cd affects negatively, both biochemically and photochemically, the establishment by seed process of J. acutus highlighting the potential of the use of this specie seed as potential sentinel and ecotoxicity test in extreme conditions.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1016/j.ecss.2015.10.005pt_PT
dc.identifier.issn0272-7714
dc.identifier.urihttp://hdl.handle.net/10451/41059
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.subjectEcotoxicologypt_PT
dc.subjectChlorophyll fluorescencept_PT
dc.subjectHeavy metal stresspt_PT
dc.subjectHalophytept_PT
dc.titleBiochemical and photochemical feedbacks of acute Cd toxicity in Juncus acutus seedlings: The role of non-functional Cd-chlorophyllspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage239pt_PT
oaire.citation.startPage228pt_PT
oaire.citation.titleEstuarine, Coastal and Shelf Sciencept_PT
oaire.citation.volume167pt_PT
person.familyNameDuarte
person.familyNameCaçador
person.givenNameBernardo
person.givenNameIsabel
person.identifier89449
person.identifier.ciencia-id731E-093F-D4C8
person.identifier.ciencia-id631C-9FFE-CA81
person.identifier.orcid0000-0003-1914-7435
person.identifier.orcid0000-0002-4475-6091
person.identifier.ridH-2001-2011
person.identifier.ridC-2618-2012
person.identifier.scopus-author-id20734149900
person.identifier.scopus-author-id6602533871
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationa72f0f40-c224-49ad-ba21-ebb5f9aab09c
relation.isAuthorOfPublication02ecb390-88b9-4e2f-8690-eba66c3b5311
relation.isAuthorOfPublication.latestForDiscoverya72f0f40-c224-49ad-ba21-ebb5f9aab09c

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