Phytoremediation of Heavy Metal Contaminated Soils

Phytoremediation is a green technology that employs plants and associated microorganisms to remove, stabilise or degrade heavy metal pollutants in soil. Key strategies include phytoextraction, whereby metal‐accumulating species take up contaminants into harvestable biomass, and phytostabilisation, which involves immobilising metals in the root zone to prevent leaching and erosion. Hyperaccumulator plants deploy specialised transporters and chelators to sequester metals in vacuoles, while root‐associated microbes can enhance bioavailability or assist in metal chelation. Recent advances have elucidated the molecular basis of metal uptake and detoxification, including metallothionein and phytochelatin synthesis, and have harnessed omics tools to engineer enhanced tolerance. Phytoremediation offers a cost‐effective, in situ solution for degraded land, with applications ranging from post‐industrial sites to agricultural soils. Nonetheless, limitations such as slow kinetics, depth constraints and potential food‐chain transfer require integrated approaches, including soil amendments, genetic improvement of plants and microbe–plant consortia.

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Phytoremediation of Heavy Metal Contaminated Soils publication trend

The graph below shows the total number of articles in phytoremediation of heavy metal contaminated soils across all publications each year (not limited to Nature Index journals).

Technical terms

Phytoextraction: Uptake of heavy metals by plant roots and translocation into above‐ground tissues for subsequent harvest.

Phytostabilisation: Immobilisation of metals in the soil–root interface to reduce mobility and bioavailability.

Hyperaccumulator: Plant species able to concentrate exceptionally high metal levels in their tissues without phytotoxic effects.

Chelator: Molecule (organic or enzymatic) that binds metal ions, facilitating uptake, transport or sequestration.

Oxidative potential: Measure of a soil’s capacity to generate reactive oxygen species, used as an indicator of metal‐induced plant stress.

References

1. Can oxidative potential be a plant risk indicator for heavy metals contaminated soil? Analysis of ryegrass (Lolium perenne L.) metabolome based on machine learning. Eco-Environment & Health (2025).
2. Heavy Metal Tolerance in Plants: Role of Transcriptomics, Proteomics, Metabolomics, and Ionomics. Frontiers in Plant Science (2016).
3. A Review on Heavy Metals (As, Pb, and Hg) Uptake by Plants through Phytoremediation. International Journal of Chemical Engineering (2011).
4. Heavy metals toxicity in plants: An overview on the role of glutathione and phytochelatins in heavy metal stress tolerance of plants. South African Journal of Botany (2010).
5. Phytoremediation: A Promising Approach for Revegetation of Heavy Metal-Polluted Land. Frontiers in Plant Science (2020).
6. Heavy Metal Polluted Soils: Effect on Plants and Bioremediation Methods. Applied and Environmental Soil Science (2014).
7. Microbial and Plant-Assisted Bioremediation of Heavy Metal Polluted Environments: A Review. International Journal of Environmental Research and Public Health (2017).