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Cadmium uptake by durum wheat in presence of citrate

hal.structure.identifierTransfert Sol-Plante et Cycle des Eléments Minéraux dans les Ecosystèmes Cultivés [TCEM]
dc.contributor.authorPANFILI, F.
hal.structure.identifierTransfert Sol-Plante et Cycle des Eléments Minéraux dans les Ecosystèmes Cultivés [TCEM]
dc.contributor.authorSCHNEIDER, A.
hal.structure.identifierTransfert Sol-Plante et Cycle des Eléments Minéraux dans les Ecosystèmes Cultivés [TCEM]
dc.contributor.authorVIVES, A.
hal.structure.identifierCentre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
dc.contributor.authorPERROT, F.
hal.structure.identifierCentre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
dc.contributor.authorHUBERT, P.
hal.structure.identifierTransfert Sol-Plante et Cycle des Eléments Minéraux dans les Ecosystèmes Cultivés [TCEM]
dc.contributor.authorPELLERIN, S.
dc.date.issued2009-03
dc.identifier.issn0032-079X
dc.description.abstractEnThe aim of this study was to determine the mechanisms underlying the uptake of Cd by durum wheat (Triticum turgidum L. ssp. durum cv. “acalou”) in the presence of citrate under hydroponic conditions. Wheat seedlings were exposed for 3 h to simplified nutrient solutions initially containing 35 nM of free Cd with or without citrate. Uptake experiments with citrate alone were also performed. Solutions were radio labelled with 109Cd or citrate-14C. The depletion of Cd and citrate in the exposure solution was followed, and at the end of the exposure Cd and citrate were quantified in all compartments of the experimental system (root surface, inner roots and aerial parts). The apparent rates of internalization of Cd (r Cd) and citrate (r cit) were estimated from the ratio of the uptake flux to the contents adsorbed at the root surface. About two times more Cd was taken up in the presence of citrate. Assuming that citrate and Cd-citrate complexes were taken up at the same rate, a direct uptake of intact complexes could not account for the higher uptake of Cd in presence of citrate. In addition, Cd was internalized at the same rate in the absence or presence of citrate (r Cd = 3.62 h−1), whereas the internalization rate constants of Cd and citrate were different (r Cd ≈ 8 r cit). This strengthens the idea that a direct uptake of non-dissociated Cd-citrate complexes probably did not account for the higher Cd uptake in presence of citrate. A dissociation of Cd-citrate complexes within the diffusion layer or at the root surface and the subsequent additional supply of free Cd were more likely to explain the higher Cd uptake in presence of citrate.
dc.language.isoen
dc.publisherSpringer Verlag
dc.subject.enBio-uptake
dc.subject.enOrganic acids
dc.subject.enMetal-complexes
dc.subject.enDiffusion limitation
dc.subject.enRoot surface
dc.title.enCadmium uptake by durum wheat in presence of citrate
dc.typeArticle de revue
dc.identifier.doi10.1007/s11104-008-9782-2
dc.subject.halSciences de l'environnement/Biodiversité et Ecologie
bordeaux.journalPlant and Soil
bordeaux.page299-309
bordeaux.volume316
bordeaux.issue1-2
bordeaux.peerReviewedoui
hal.identifierin2p3-00374388
hal.version1
hal.popularnon
hal.audienceNon spécifiée
hal.origin.linkhttps://hal.archives-ouvertes.fr//in2p3-00374388v1
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