Zinc Hyperaccumulation in Plants: A Review

Balafrej, Habiba; Bogusz, Didier; Triqui, Zine El Abidine; Guedira, Abdelkarim; Bendaou, Najib; Smouni, Abdelaziz; Fahr, Mouna

doi:10.3390/plants9050562

Cited by 196 publications

(124 citation statements)

References 174 publications

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“…Among heavy metals, zinc (Zn) and cadmium (Cd) are naturally occurring in the environment but their presence is often increased because of the anthropogenic activity such as agricultural practices and industrial processes (Balafrej et al ., 2020; Genchi et al ., 2020).…”

Section: Introductionmentioning

confidence: 99%

Heavy metals modulate DNA compaction and methylation at CpG sites in the metal hyperaccumulator Arabidopsis halleri

Galati

Gullì

Giannelli

et al. 2021

Environ and Mol Mutagen

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Excess heavy metals affect plant physiology by inducing stress symptoms, however several species have evolved the ability to hyperaccumulate metals in above‐ground tissues without phytotoxic effects. In this study we assume that at subcellular level, different strategies were adopted by hyperaccumulator versus the non‐accumulator plant species to face the excess of heavy metals. At this purpose the comet assay was used to investigate the nucleoid structure modifications occurring in response to Zn and Cd treatments in the I16 and PL22 populations of the hyperaccumulator Arabidopsis halleri versus the nonaccumulator species Arabidopsis thaliana. Methy‐sens comet assay and RT‐qPCR were also performed to associate metal induced variations in nucleoids with possible epigenetic modifications. The comet assay showed that Zn induced a mild but non significant reduction in the tail moment in A. thaliana and in both I16 and PL22. Cd treatment induced an increase in DNA migration in nuclei of A. thaliana, whereas no differences in DNA migration was observed for I16, and a significant increase in nucleoid condensation was found in PL22 Cd treated samples. This last population showed higher CpG DNA methylation upon Cd treatment than in control conditions, and an up‐regulation of genes involved in symmetric methylation and histone deacetylation. Our data support the hypothesis of a possible role of epigenetic modifications in the hyperaccumulation trait to cope with the high Cd shoot concentrations. In addition, the differences observed between PL22 and I16 could reinforce previous suggestions of divergent strategies for metals detoxification developing in the two metallicolous populations.

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Section: Introductionmentioning

confidence: 99%

Heavy metals modulate DNA compaction and methylation at CpG sites in the metal hyperaccumulator Arabidopsis halleri

Galati

Gullì

Giannelli

et al. 2021

Environ and Mol Mutagen

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“…The importance of Zn in plant growth development, reproduction, and yield is non-negligible [ 40 ]. Among all the Zn nanoparticle treatments, the T5 (foliar treatment of the Zn nanoparticles 15 mg/L) was significantly higher as compared to Zn nanoparticles treated seeds.…”

Section: Resultsmentioning

confidence: 99%

“…Protein content. The importance of Zn in plant growth development, reproduction, and yield is non-negligible [40]. Among all the Zn nanoparticle treatments, the T5 (foliar treatment PLOS ONE https://doi.org/10.1371/journal.pone.0241568.g001…”

Section: Biochemical Profilingmentioning

confidence: 99%

Nano zinc elicited biochemical characterization, nutritional assessment, antioxidant enzymes and fatty acid profiling of rapeseed

et al. 2020

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The use of nanomaterials in agriculture is a current need and could be helpful in overcoming food security risks. Brassica napus L. is the third most important crop for edible oil, having double low unsaturated fatty acids. In the present study, we investigated the effects of green synthesized Zn NPs on biochemical effects, antioxidant enzymes, nutritional quality parameters and on the fatty acid profile of rapeseed (B. napus). Plant-mediated synthesis of zinc nanoparticles (Zn NPs) was carried out using Mentha arvensis L. leaf extract followed by characterization through ultraviolet–visible spectroscopy (UV-vis), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-Ray (EDX), and X-Ray diffraction (XRD). NPs exhibited irregular shapes ranging in size from 30–70 nm and EDX analysis confirmed 96.08% of Zn in the sample. The investigated biochemical characterization (protein content, proline content, total soluble sugar (TSS), total flavonoid content (TFC), and total phenolic content (TPC) showed a substantial change on exposure to Zn NPs. A dose-dependent gradual increase was observed in the antioxidant enzymes, superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT). Oil and moisture contents dropped significantly from the control level in the rapeseed (B. napus) varieties. However, different trends in nutritional (Zn, Na+, K+) and fatty acid profiling of B. napus have been noted. This study demonstrates that Zn NPs have the potential to improve the biochemical, nutritional, antioxidant enzymes, and fatty acid profile of B. napus varieties.

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“…South Devon has naturally high occurring concentrations of heavy metals including Zn owing to its metalliferous background geology. Existing high Zn levels may result in the development of tolerant species that can hyperaccumulate metals [31]. Therefore, the effects of Zn may not be as damaging to ecosystems as studies suggest.…”

Section: River Teign Compliancementioning

confidence: 99%

Assessing Options for Remediation of Contaminated Mine Site Drainage Entering the River Teign, Southwest England

et al. 2020

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The river Teign in Devon has come under scrutiny for failing to meet environmental quality standards for ecotoxic metals due to past mining operations. A disused mine known as Bridford Barytes mine, has been found to contribute a significant source of Zn, Cd and Pb to the river. Recently, studies have been focused on the remediation of such mine sites using low-cost treatment methods to help reduce metal loads to the river downstream. This paper explores the metal removal efficiency of red mud, a waste product from the aluminium industry, which has proven to be an attractive low-cost treatment method for adsorbing toxic metals. Adsorption kinetics and capacity experiments reveal metal removal efficiencies of up to 70% within the first 2 h when red mud is applied in pelletized form. Further, it highlights the potential of biochar, another effective adsorbent observed to remove >90% Zn using agricultural feedstock. Compliance of the Teign has been investigated by analysing dissolved metal concentrations and bioavailable fractions of Zn to assess if levels are of environmental concern. By applying a real-world application model, this study reveals that compressed pellets and agricultural biochar offer an effective, low-cost option to reducing metal concentrations and thus improving the quality of the river Teign.

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Zinc Hyperaccumulation in Plants: A Review

Cited by 196 publications

References 174 publications

Heavy metals modulate DNA compaction and methylation at CpG sites in the metal hyperaccumulator Arabidopsis halleri

Heavy metals modulate DNA compaction and methylation at CpG sites in the metal hyperaccumulator Arabidopsis halleri

Nano zinc elicited biochemical characterization, nutritional assessment, antioxidant enzymes and fatty acid profiling of rapeseed

Assessing Options for Remediation of Contaminated Mine Site Drainage Entering the River Teign, Southwest England

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