X-ray absorption spectroscopy evidence of sulfur-bound cadmium in the Cd-hyperaccumulator Solanum nigrum and the non-accumulator Solanum melongena
| Autor: | Till Fehlauer, Jérôme Rose, Perrine Chaurand, Catherine Keller, Marie-Noëlle Pons, Emmanuel Doelsch, Clément Levard, Blanche Collin |
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| Přispěvatelé: | Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Recyclage et risque (UPR Recyclage et risque), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Département Performances des systèmes de production et de transformation tropicaux (Cirad-PERSYST) |
| Rok vydání: | 2020 |
| Předmět: |
010504 meteorology & atmospheric sciences
Health Toxicology and Mutagenesis Speciation Détoxification 010501 environmental sciences Solanum nigrum Toxicology 01 natural sciences Plant Roots chemistry.chemical_compound Soil Pollutants Solanaceae Cadmium biology General Medicine [SDV.BV.BOT]Life Sciences [q-bio]/Vegetal Biology/Botanics Pollution Bioaccumulation Biodegradation Environmental X-Ray Absorption Spectroscopy [SDE]Environmental Sciences Thiol P02 - Pollution Melongena chemistry.chemical_element Hyperaccumulator Solanum melongena 0105 earth and related environmental sciences Toxicity Acide organique Glutathione biology.organism_classification Sulfur chemistry Spectroscopie aux rayons x H50 - Troubles divers des plantes Solanum Nuclear chemistry |
| Zdroj: | Environmental Pollution Environmental Pollution, 2021, 279, pp.116897. ⟨10.1016/j.envpol.2021.116897⟩ Environmental Pollution, Elsevier, 2021, 279, pp.116897. ⟨10.1016/j.envpol.2021.116897⟩ |
| ISSN: | 1873-6424 0269-7491 |
| DOI: | 10.1016/j.envpol.2021.116897⟩ |
| Popis: | International audience; It has been proposed that non-protein thiols and organic acids play a major role in cadmium phytoavailability and distribution in plants. In the Cd-hyperaccumulator Solanum nigrum and non-accumulator Solanum melongena, the role of these organic ligands in the accumulation and detoxification mechanisms of Cd are debated. In this study, we used X-ray absorption spectroscopy to investigate Cd speciation in these plants (roots, stem, leaves) and in the soils used for their culture to unravel the plants responses to Cd exposure. The results show that Cd in the 100 mg.kg-1 Cd-doped clayey loam soil is sorbed onto iron oxyhydroxides. In both S. nigrum and S. melongena, Cd in roots and fresh leaves is mainly bound to thiol ligands, with a small contribution of inorganic S ligands in S. nigrum leaves. We interpret the Cd binding to sulfur ligands as detoxification mechanisms, possibly involving the sequestration of Cd complexed with glutathione or phytochelatins in the plant vacuoles. In the stems, results show an increase binding of Cd to -O ligands (>50% for S. nigrum). We suggest that Cd is partly complexed by organic acids for transportation in the sap. |
| Databáze: | OpenAIRE |
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