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LEFÈVRE, ISABELLE; VOGEL‐MIKU , KATARINA; JEROMEL, LUKA; VAVPETIČ, PRIMOŽ; PLANCHON, SÉBASTIEN; ARČON, IZTOK; ELTEREN, JOHANNES T VAN; LEPOINT, GILLES; GOBERT, SYLVIE; RENAUT, JENNY; PELICON, PRIMOŽ; LUTTS, STANLEY
Plant, cell and environment, June 2014, Volume: 37, Issue: 6Journal Article, Web Resource
Cadmium and zinc share many similar physiochemical properties, but their compartmentation, complexation and impact on other mineral element distribution in plant tissues may drastically differ. In this study, we address the impact of 10 μm Cd or 50 μm Zn treatments on ion distribution in leaves of a metallicolous population of the non‐hyperaccumulating species Zygophyllum fabago at tissue and cell level, and the consequences on the plant response through a combined physiological, proteomic and metabolite approach. Micro‐proton‐induced X‐ray emission and laser ablation inductively coupled mass spectrometry analyses indicated hot spots of Cd concentrations in the vicinity of vascular bundles in response to Cd treatment, essentially bound to S‐containing compounds as revealed by extended X‐ray absorption fine structure and non‐protein thiol compounds analyses. A preferential accumulation of Zn occurred in vascular bundle and spongy mesophyll in response to Zn treatment, and was mainly bound to O/N‐ligands. Leaf proteomics and physiological status evidenced a protection of photosynthetically active tissues and the maintenance of cell turgor through specific distribution and complexation of toxic ions, reallocation of some essential elements, synthesis of proteins involved in photosynthetic apparatus or C‐metabolism, and metabolite synthesis with some specificities regarding the considered heavy metal treatment.
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