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

Mishra, Bhoopesh, McDonald, Louis M., Roy, Mimi, Lanzirotti, Antonio and Myneni, Satish C. B. (2020) Uptake and speciation of zinc in edible plants grown in smelter contaminated soils. PLoS ONE, 15 (4). ISSN 19326203

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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.

Item Type: Article
Keywords: Edible Plants | Zn Speciation in Plants
Subjects: Physical, Life and Health Sciences > Botany and Zoology
JGU School/Centre: Jindal School of Liberal Arts & Humanities
Depositing User: Amees Mohammad
Date Deposited: 13 Dec 2021 09:47
Last Modified: 23 Dec 2021 11:46
Official URL: https://doi.org/10.1371/journal.pone.0226180
Funders: National Science Foundation, United States of America, U.S. Department of Energy, United States of America, University of Chicago, United States of America, University of Kentucky, United States of America
URI: https://pure.jgu.edu.in/id/eprint/153


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