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Ionomics analysis provides new insights into the co-enrichment of cadmium and zinc in wheat grains

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Qin, X, Xia, Y, Hu, C, Yu, M, Shabala, S ORCID: 0000-0003-2345-8981, Wu, S, Tan, Q, Xu, S and Sun, X 2021 , 'Ionomics analysis provides new insights into the co-enrichment of cadmium and zinc in wheat grains' , Ecotoxicology and Environmental Safety, vol. 223 , doi: 10.1016/j.ecoenv.2021.112623.

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Abstract

Cadmium (Cd) is present in many soils and, when enter a food chain, represents a major health threat to humans. The existent large variation in grain Cd content amongst wheat genotypes opens prospects for genetic improvement for reduced Cd uptake in this species. However, selecting low-Cd-accumulating varieties comes with a possible caveat of affecting uptake other essential nutrients. In this work, we screened 134 wheat varieties in 3 various field studies and selected 15 high- and 15 low-Cd accumulating varieties in grains for ionomics analysis. Our results showed that high-Cd accumulating varieties also possessed an ability to accumulate mineral elements of calcium, magnesium, manganese, iron and zinc, while varieties with low Cd content were deficient in many essential nutrients and, especially, zinc (Zn). The above data was confirmed in an independent trail involving another 97 wheat varieties. Thus, selecting plants for high Zn accumulation (as a part of biofortification programs) resulted in an inadvertent increase in accumulation of the toxic Cd in wheat. Vice versa, selecting low Cd-accumulating varieties comes with a danger of reducing their Zn content, with major consequences to food quality and human health. We suggest that the above conundrum can be resolved by understanding the structure-function relations of various transporters isoforms involved in Zn and Cd transport and issue-specific mode of their operation, via cell-based phenotyping followed by molecular breeding.

Item Type: Article
Authors/Creators:Qin, X and Xia, Y and Hu, C and Yu, M and Shabala, S and Wu, S and Tan, Q and Xu, S and Sun, X
Keywords: zinc, cadmium, grain, ionome, wheat, elemental toxicity, long-distant transport
Journal or Publication Title: Ecotoxicology and Environmental Safety
Publisher: Academic Press Inc Elsevier Science
ISSN: 0147-6513
DOI / ID Number: 10.1016/j.ecoenv.2021.112623
Copyright Information:

Copyright 2021 The Author(s)Licensed under Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)https://creativecommons.org/licenses/by-nc-nd/4.0/

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