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dc.contributor.authorReis, Marlos O.-
dc.contributor.authorNecchi, Orlando-
dc.contributor.authorColepicolo, Pio-
dc.contributor.authorBarros, Marcelo P.-
dc.identifier.citationPesticide Biochemistry and Physiology. San Diego: Academic Press Inc. Elsevier B.V., v. 99, n. 1, p. 7-15, 2011.-
dc.description.abstractDiuron is one of the most commonly found N-phenylurea herbicides in marine/estuarine waters that promotes toxic effects by inhibiting photosynthesis and affecting the production of reactive oxygen species (ROS) in autotrophs. Since photo- and thermoacclimation are also ROS-mediated processes, this work evaluates a hypothetical additive effect of high light (HL) and chilling (12 degrees C) on 50 nM diuron toxicity to the highly-photosynthetically active apices of the red alga Kappaphycus alvarezii. Additive inhibition of photosynthesis was mainly evidenced by significant decreases of quantum yield of photosystem II and electron transfer rates upon co-stressors exposure to diuron-treated algae. Under extreme 12 degrees C/HL/diuron conditions, unexpected lower correlations between H2O2 concentrations in seawater and radical-sensitive protein thiols were concomitantly measured with the highest indexes of photoinhibition (parameter beta). Altogether, these data support the hypothesis that co-stressors chilling/HL additively inhibit photosynthesis in diuron-exposed K. alvarezii but with less involvement of H2O2 in injury effects than with only chilling or HL. (C) 2010 Elsevier B.V. All rights reserved.en
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
dc.description.sponsorshipInternational Foundation for Science (IFS, Sweden)-
dc.publisherAcademic Press Inc. Elsevier B.V.-
dc.sourceWeb of Science-
dc.subjectOxidative stressen
dc.subjectFree radicalsen
dc.subjectKappaphycus alvareziien
dc.subjectHydrogen peroxideen
dc.titleCo-stressors chilling and high light increase photooxidative stress in diuron-treated red alga Kappaphycus alvarezii but with lower involvement of H2O2en
dc.contributor.institutionUniv Cruzeiro Sul-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.contributor.institutionUniversidade de São Paulo (USP)-
dc.description.affiliationUniv Cruzeiro Sul, CBS, Programa Quim Ambiental Environm Chem, BR-08060070 São Paulo, Brazil-
dc.description.affiliationUniv Estadual Paulista, Dept Bot, BR-15054000 Sao Jose do Rio Preto, SP, Brazil-
dc.description.affiliationUniv São Paulo, Inst Quim, Dept Bioquim, BR-05599970 São Paulo, Brazil-
dc.description.affiliationUnespUniv Estadual Paulista, Dept Bot, BR-15054000 Sao Jose do Rio Preto, SP, Brazil-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofPesticide Biochemistry and Physiology-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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