Uptake and speciation of zinc in edible plants grown in smelter contaminated soils.

Autor: Mishra B; School of Chemical and Process Engineering, University of Leeds, Leeds, England, United Kingdom.; Department of Physics, Illinois Institute of Technology, Chicago, Illinois, United States of America., McDonald LM; Division of Plant and Soil Sciences, West Virginia University, Morgantown, West Virginia, United States of America., Roy M; Jindal School of Liberal Arts and Humanities, OP Jindal Global University, Sonipat, Haryana, India., Lanzirotti A; GeoSoil CARS, University of Chicago, Chicago, Illinois, United States of America., Myneni SCB; Department of Geosciences, Princeton University, Princeton, New Jersey, United States of America.
Jazyk: angličtina
Zdroj: PloS one [PLoS One] 2020 Apr 17; Vol. 15 (4), pp. e0226180. Date of Electronic Publication: 2020 Apr 17 (Print Publication: 2020).
DOI: 10.1371/journal.pone.0226180
Abstrakt: Heavy metal accumulation in edible plants grown in contaminated soils poses a major environmental risk to humans and grazing animals. This study focused on the concentration and speciation of Zn in different edible plants grown in soils contaminated with smelter wastes (Spelter, WV, USA) containing high levels of the metals Zn, Cu, Pb, Cd. Their accumulation was examined in different parts (roots, stem, and leaves) of plants and as a function of growth stage (dry seed, sprouting seed, cotyledon, and leaves) in the root vegetables radish, the leafy vegetable spinach and the legume clover. Although the accumulation of metals varied significantly with plant species, the average metal concentrations were [Zn] > [Pb] > [Cu] > [Cd]. Metal uptake studies were complemented with bulk and micro X-ray absorption spectroscopy (XAS) at Zn K-edge and micro X-ray fluorescence (μXRF) measurements to evaluate the speciation and distribution of Zn in these plant species. Dynamic interplay between the histidine and malate complexation of Zn was observed in all plant species. XRF mapping of spinach leaves at micron spatial resolution demonstrated the accumulation of Zn in vacuoles and leaf tips. Radish root showed accumulation of Zn in root hairs, likely as ZnS nanoparticles. At locations of high Zn concentration in spinach leaves, μXANES suggests Zn complexation with histidine, as opposed to malate in the bulk leaf. These findings shed new light on the dynamic nature of Zn speciation in plants.
Competing Interests: The authors have declared that no competing interests exist.
Databáze: MEDLINE
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