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Plant sciences, sustainable farming systems and food quality
RESEARCH ARTICLE

Soil zinc application decreases arsenic and increases zinc accumulation in grains of zinc-biofortified wheat cultivars

Ammara Basit https://orcid.org/0000-0002-2412-0440 A and Shahid Hussain https://orcid.org/0000-0002-2497-127X A *
+ Author Affiliations
- Author Affiliations

A Department of Soil Science, Faculty of Agricultural Sciences and Technology, Bahauddin Zakariya University, Multan 60800, Pakistan.

* Correspondence to: shahid.hussain@bzu.edu.pk

Handling Editor: Caixian Tang

Crop & Pasture Science 75, CP23275 https://doi.org/10.1071/CP23275
Submitted: 25 September 2023  Accepted: 5 March 2024  Published: 29 March 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Context

Arsenic (As) is a noxious metalloid for plants, animals and humans. Elevated levels of As in soils may cause it to accumulate to above-permissible levels in wheat grains, posing a threat to human health. Moreover, vulnerable population groups in developing countries have inadequate dietary zinc (Zn) linked to cereal-based diets.

Aims

The present study evaluated the effect of soil Zn application on accumulation of As and Zn in grains of two Zn-biofortified wheat (Triticum aestivum L.) cultivars (Akbar-2019 and Zincol-2016).

Methods

Wheat plants were grown on an alkaline calcareous soil spiked with three levels of As (0, 5 and 25 mg kg−1). Before sowing, two rates of Zn (0 and 8 mg kg−1) were also applied to the soil.

Key results

Arsenic spiking in soil decreased plant dry matter yield, chlorophyll pigments, and phosphorus (P) and Zn accumulation, and increased As accumulation in wheat. By contrast, soil Zn application enhanced crop yield and increased P and Zn accumulation, with a simultaneous decrease in As accumulation in both cultivars. Compared with the Zn control, soil Zn application decreased grain As concentration by 26%, 30% and 32% for plants grown in soil spiked with 0, 5 and 25 mg As kg−1, respectively.

Conclusions

Applying Zn to As-spiked soil mitigates the harmful effects of As by increasing Zn and decreasing As concentrations in wheat, resulting in improved grain quality for human consumption.

Implications

Zinc application to crop plants should be recommended for addressing the health implications associated with As-contaminated crops and human Zn deficiency.

Keywords: Akbar-2019, arsenic toxicity, grain quality, zinc application, zinc deficiency, Zincol-2016.

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