Speciation of uranium in plants upon root accumulation and root-to-shoot translocation: A XAS and TEM study - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Environmental and Experimental Botany Année : 2012

Speciation of uranium in plants upon root accumulation and root-to-shoot translocation: A XAS and TEM study

Résumé

Uranium mobilization in surface waters and soils is highly dependent on its speciation. Links between U speciation and in planta mobility remain unclear, although understanding this relationship is essential in a view to properly develop efficient phytoremediation strategies. To address this question, we used X-ray absorption spectroscopy (XAS) and transmission electron microscopy (TEM) to determine U speciation and distribution in plant roots and leaves when exposed to U in the form of different chemical species. Our results indicate that U complexation with endogenous phosphate residues leads to its precipitation and fixation in plant organs, avoiding translocation from roots to leaves. We also show that complexation with a strong ligand such as citrate in exposure solution circumvents this precipitation, and enhances root-to-shoot translocation, in a U-carboxylate complex form. These results highlight correlations between U speciation in the environment and its mobility pattern in plants, which would help for phytoremediation purposes. (C) 2011 Elsevier B.V. All rights reserved.

Dates et versions

hal-00651476 , version 1 (13-12-2011)

Identifiants

Citer

Julien Laurette, Camille Larue, Isabelle Llorens, Danielle Jaillard, Pierre-Henri Jouneaud, et al.. Speciation of uranium in plants upon root accumulation and root-to-shoot translocation: A XAS and TEM study. Environmental and Experimental Botany, 2012, 77, pp.87-95. ⟨10.1016/j.envexpbot.2011.11.005⟩. ⟨hal-00651476⟩
202 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More