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X-ray absorption spectroscopy evidence of sulfur-bound Cadmium in the Cd-hyperaccumulator Solanum nigrum and the non-accumulator Solanum melongena

DOI: 10.1016/j.envpol.2021.116897 DOI Help

Authors: Marie-Laure Pons (Aix Marseille Univ, CNRS, IRD, INRAE) , Blanche Collin (Aix Marseille Univ, CNRS, IRD, INRAE) , Emmanuel Doelsch (CIRAD) , Perrine Chaurand (Aix Marseille Univ, CNRS, IRD, INRAE) , Till Fehlauer (Aix Marseille Univ, CNRS, IRD, INRAE) , Clement Levard (Aix Marseille Univ, CNRS, IRD, INRAE) , Catherine Keller (Aix Marseille Univ, CNRS, IRD, INRAE) , Jérôme Rose (Aix Marseille Univ, CNRS, IRD, INRAE)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Environmental Pollution , VOL 108

State: Published (Approved)
Published: March 2021
Diamond Proposal Number(s): 23312

Abstract: 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 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.

Journal Keywords: Cadmium; Speciation; Toxicity; Solanaceae; X-ray absorption spectroscopy

Subject Areas: Chemistry, Environment

Instruments: B18-Core EXAFS

Added On: 16/03/2021 13:58

Discipline Tags:

Organic Chemistry Earth Sciences & Environment Desertification & Pollution Plant science Life Sciences & Biotech Agriculture & Fisheries Chemistry

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