The research team, led by Bahar Sürmelihindi of Gaziantep University and colleagues from several Turkish institutions, focused on two very different plants with two very different relationships to the human diet. The first was Hypericum perforatum, commonly known as St. John’s wort, a medicinal herb widely harvested across Anatolia and consumed in teas and herbal preparations. The second was Capsicum annuum, the pepper, a staple vegetable crop grown intensively in the region. By comparing metal concentrations in both species and in the soils beneath them across earthquake-affected Hatay, Kahramanmaraş, Malatya, Adıyaman, and Gaziantep with control samples from Aydın and Manisa, the researchers could isolate the signature of seismic disturbance from the background of ordinary agricultural and industrial contamination.

The analytical backbone of the study was inductively coupled plasma mass spectrometry, or ICP-MS, a technique capable of detecting trace elements at concentrations down to parts per billion. Soil and plant samples were digested and introduced into a plasma torch heated to roughly 10,000 Kelvin, where individual atoms were ionized and sorted by their mass-to-charge ratio. This allowed the team to quantify a broad suite of elements, from essential macronutrients such as calcium, magnesium, and potassium to the notorious toxic quartet of cadmium, chromium, lead, and mercury, along with nickel, which emerged as one of the most striking signals in the dataset.

The results were unambiguous. Concentrations of multiple heavy metals were significantly higher in both soils and plant tissues from the earthquake-affected provinces than in the control sites. Nickel, an element that is toxic to humans at elevated doses and a known carcinogen through inhalation, ranged from 16 to 24 milligrams per kilogram in pepper fruits and reached concentrations as high as 48 milligrams per kilogram in St. John’s wort samples. Translocation factors, which describe the ratio of metal concentration in plant tissues to that in the surrounding soil, indicated a moderate transfer of metals from soil into edible plant parts. In plain terms, the earthquake-affected landscape was not merely contaminated; the contamination was finding its way into the plants that people harvest, eat, and brew.

One of the most intriguing signals came not from the toxic metals but from the benign ones. Elevated levels of calcium, magnesium, and potassium in the leaves of St. John’s wort pointed to an additional and somewhat unexpected source of input: post-earthquake dust deposition and demolition-derived particulates. When thousands of buildings collapse, they release enormous quantities of pulverized concrete, masonry, plaster, and mineral dust that settle on soil surfaces and plant foliage. That dust carries its own elemental fingerprint, rich in the calcium silicates and carbonates of construction materials, and the researchers argue that this deposition contributed measurably to the mineral load observed in plant leaves. It is a reminder that an earthquake’s environmental footprint is not confined to the ground rupture; it extends into the air and settles back down over everything that grows.

The toxic metals told a more complicated story. Increased concentrations of cadmium, chromium, lead, and mercury were detected across the affected region, but they were particularly pronounced in the industrialized provinces. This spatial pattern suggests that the earthquake did not create these contaminants so much as redistribute and remobilize them. Southern Turkey hosts substantial industrial activity, including cement production, metal processing, and textile manufacturing, all of which leave legacy deposits of heavy metals in soils and sediments. Seismic shaking can crack containment structures, disturb buried waste, liquefy waterlogged sediments, and grind contaminated materials into finer, more mobile particles. Previous research on transient seismic stresses has shown that earthquakes can dramatically alter the permeability of soils and aquifers, changing how water and dissolved substances move through the subsurface. The new study is consistent with the hypothesis that such post-earthquake environmental changes, including soil degradation and particle redistribution, can increase the bioavailability of heavy metals and their uptake by plant roots.

The statistical evidence reinforces the pattern. Using one-way analysis of variance, the team found highly significant differences between earthquake-affected and control regions, with a p-value of 0.001, meaning there is only about a one in a thousand chance that the observed differences arose from random variation alone. In environmental monitoring, where natural heterogeneity in soil chemistry often muddies comparisons between sites, a result this clean across multiple elements and two plant species is notable. It suggests the seismic signal is real, systematic, and detectable through the noise of ordinary agricultural variation.

The choice of study plants matters for interpreting the findings. St. John’s wort is a medicinal plant whose dried aerial parts are consumed in concentrated forms, meaning that any metal burden it carries is delivered directly to consumers, often in the name of health. The species is also known from prior research to accumulate metals from soil, making it a useful biological monitor of environmental contamination. Peppers, by contrast, are a fresh food crop, and the detection of nickel at 16 to 24 milligrams per kilogram in the fruits raises immediate questions about dietary exposure thresholds. International food safety standards set limits for cadmium and lead in vegetables, and while the study did not perform a formal health risk assessment, the authors explicitly flag the need for further research into the potential food safety of edible plant tissues from the affected region. That caution is warranted: chronic low-level exposure to cadmium damages kidneys, lead impairs neurological development, and chromium in its hexavalent form is carcinogenic.

The broader significance of the study lies in what it reveals about disasters as environmental events, not just structural ones. Earthquakes are typically assessed in terms of casualties, building damage, and economic loss. But the physical perturbation of a landscape, the fracturing of soil horizons, the pulverization of contaminated building stock, the dust plumes that blanket agricultural land, constitutes a form of geochemical disturbance that science is only beginning to quantify. Comparable concerns have been raised after other major earthquakes, including observations of liquefaction and subsidence during the 2008 Wenchuan earthquake in China, which reshaped soils across vast areas. The Turkish study adds plant uptake to that picture, connecting the geology of a seismic event to the biology of the food chain.

For the affected communities, the practical implications are still taking shape. Much of the agriculture in Hatay, Kahramanmaraş, and the surrounding provinces continues on land that experienced intense shaking and months of demolition activity. Farmers, herbal collectors, and food processors in the region now have an evidence base suggesting that their soils and crops may carry an elevated metal burden, and that this burden reflects a combination of seismic mobilization, dust fallout, and pre-existing industrial contamination. The researchers call for continued monitoring and further investigation into food safety, a recommendation that aligns with a growing recognition among environmental scientists that disaster recovery must include environmental chemistry alongside engineering and reconstruction. The ground beneath southern Turkey was shaken once in a matter of minutes; the chemical consequences, this study suggests, may unfold over years, quietly moving through roots and leaves into the region’s food and medicine.

Subject of Research: Heavy metal mobilization and plant uptake in soils of earthquake-affected regions of Turkey

Article Title: Heavy metal distribution in soils and plants collected from earthquake-affected regions of Turkey: a comparative assessment of Hypericum perforatum L. and Capsicum annuum L.

Article References: Sürmelihindi, B., Gökpinar, B., Morcali, M. H., Yilmaz, Y., Aksan, M. E., Koçer, F., Karakoç, S. B., & Şekeroğlu, N. (2026). Heavy metal distribution in soils and plants collected from earthquake-affected regions of Turkey: a comparative assessment of Hypericum perforatum L. and Capsicum annuum L.. Environmental Monitoring and Assessment, 198(10), Article 1108. https://doi.org/10.1007/s10661-026-15955-1

Image Credits: AI Generated

DOI: 10.1007/s10661-026-15955-1

Keywords: heavy metals, earthquake, Turkey, soil contamination, Hypericum perforatum, Capsicum annuum, ICP-MS, nickel, food safety, plant uptake, dust deposition, environmental monitoring

The scale of the contamination problem begins with the sheer volume of plastic deployed in modern agriculture. According to a landmark assessment by the Food and Agriculture Organization cited in the review, more than 12.5 million tons of plastic products are used annually in plant and animal agriculture worldwide. Plastic mulch films, greenhouse covers, drip irrigation lines and silage wraps all fragment over time under ultraviolet radiation and mechanical abrasion, shedding particles that span the full size range of microplastics, defined here as particles between 1 micrometer and 5 millimeters, down to nanoplastics measuring roughly 1 to 150 nanometers. These particles are composed of common synthetic polymers including polyethylene, polypropylene, polystyrene, polyethylene terephthalate and polyvinyl chloride, and they occur as fragments, fibers, films, beads and pellets.

The review identifies three dominant pathways delivering plastics to farmland. The first is the direct degradation of plastic mulching films, which are left in fields season after season and break down in place. The second is the land application of sewage sludge, or biosolids, which are rich in nutrients but also concentrate the microplastics that survive wastewater treatment. Treatment plants remove between 57 and 99 percent of incoming microplastics, but those captured particles accumulate in sludge at a median concentration of 22.41 particles per gram. Globally, the review estimates that between 8.2 times ten to the tenth and 1.29 times ten to the fifteenth microplastic particles, weighing between 0.4 and 6,430 tons, enter terrestrial environments through biosolids each year. Regional contributions are substantial: roughly 26,042 tonnes of microplastic-laden biosolids are recycled onto farmland annually in the European Union, about 21,249 in the United States, 13,660 in China, 1,518 in Canada and 1,241 in Australia.

The third pathway is wastewater irrigation, an increasingly common practice in water-scarce regions where treated effluent still carries microplastics that conventional treatment cannot fully remove. Field measurements reinforce the picture of accumulation. In agricultural facility soils, concentrations peak in the top 10 centimeters at 896.5 items per kilogram, dominated by polypropylene and polyethylene fibers that make up 72.2 percent of the particles, a profile the review classifies as risk level 4. Coastal plain farmland in China averages 314 items per kilogram, and a semi-arid barley system in Spain showed that sludge amendments containing 5,972 to 7,771 microplastics per kilogram of dry weight added roughly 16,000 particles to treated plots, where concentrations remained elevated and relatively constant over time. Notably, surface runoff mobilized only 0.2 to 0.4 percent of the added particles, suggesting that semi-arid agricultural soils act as long-term accumulators rather than temporary way stations.

Once embedded in the soil matrix, these particles do not sit inertly. The review documents measurable degradation of soil physicochemical properties, including altered bulk density and aggregate stability, alongside disruption of native microbial communities and their enzymatic activities. A global meta-analysis synthesized in the review found that while low concentrations of macroplastics, 30 to 240 kilograms per hectare, and microplastics, 0.01 to 100 milligrams per kilogram, sometimes produced no significant effects, higher concentrations and prolonged exposure consistently damaged crop growth and soil health. Plastic content, polymer type, particle size and the specific crop or soil animal involved emerged as the key variables governing these responses. The consequences for plants include compromised nutrient uptake, reduced photosynthetic efficiency and diminished biomass, with polystyrene particles as small as 0.08 micrometers at concentrations of 2,000 milligrams per liter producing the strongest inhibition of pea seed germination and growth.

The most consequential finding concerns translocation, the physical movement of particles from soil into plant tissue. Because intact microplastics are too large to pass through plant cell walls, direct penetration of root tissue was long considered implausible. The review, however, details a growing body of evidence that particles exploit alternative routes. Research on tobacco plants showed that while 100-nanometer polystyrene beads were not absorbed, beads of 20 to 40 nanometers were taken up directly through the cell wall. Fluorescently tagged 0.2-micrometer polystyrene microbeads were observed lodged in the mucilage layer outside the root cap, and a crack-entry mode has been documented whereby submicrometer particles exploit fissures at lateral root junctions to bypass the plant’s outer defenses. Foliar uptake adds another dimension: nanoplastics deposited on leaves can move through the plant’s vascular system, with maize studies demonstrating leaf-to-root translocation of particles whose behavior depends on their surface charge.

Inside the plant, the particles inflict damage through both physical and chemical mechanisms. Transmission electron microscopy of onion roots treated with polystyrene nanoplastics revealed cytoplasm densely packed with electron-dense structures, likely lipid bodies not yet mobilized, indicating cellular stress. Nanoplastic exposure triggers overproduction of reactive oxygen species, oxidative damage to DNA and lipids, and disruption of photosynthetic pigments. Shape matters as much as chemistry: in carrot studies, films and fibers reduced germination velocity, possibly by altering soil water dynamics, physically blocking pores or releasing toxic leachates, even though final germination percentages remained intact. Weathered plastic has even been shown to reduce seed germination across generations, with mother plants exposed to aged plastic producing seeds with impaired germination in the coastal dune species Cutandia maritima.

The review is candid that the human health implications remain incompletely quantified, but the pathway is clear. Particles that accumulate in edible tissues create a direct route of dietary exposure, and microplastics are known to act as vectors for other contaminants, adsorbing persistent organic pollutants, heavy metals and antibiotic-resistant microorganisms onto their large surface areas while simultaneously leaching plastic monomers and additives. The authors emphasize that standardized detection methods are urgently needed, since inconsistent analytical techniques make it difficult to compare concentrations across studies, and that transport models spanning from the cellular to the landscape scale are still in their infancy.

Mitigation, the review argues, must operate on multiple fronts simultaneously. Policy frameworks such as the FAO and UNEP Voluntary Code of Conduct for the Sustainable Use and Management of Plastics in Agriculture outline lifecycle management, promotion of biodegradable materials and circular economy approaches, while the European Union’s Directive 2019/904 and Circular Economy Action Plan, France’s mandate for biodegradable mulch films and China’s national standard on film thickness represent concrete regulatory steps. On the remediation side, physical techniques such as sieving and density separation achieve laboratory recoveries above 80 to 90 percent but remain practical only for small, heavily contaminated hotspots. Bioremediation offers broader promise: bacteria, fungi and actinomycetes secrete oxidases, hydrolases and alkane monooxygenases that depolymerize polyethylene, polystyrene, PET and polypropylene, with particularly potent degraders isolated from the guts of Zophobas atratus larvae. Phytoremediation adds another layer, as alfalfa grown in contaminated soil has been shown to enhance biodegradation of PET and polypropylene through combined root exudate and microbial activity.

Perhaps the most immediately actionable finding involves biochar, the carbon-rich material produced by pyrolyzing agricultural residues. Because of its porous structure and high surface area, biochar can adsorb microplastics, heavy metals and organic pollutants, limiting their transport through soil profiles and reducing plant uptake, while simultaneously improving soil aggregation, water-holding capacity and microbial diversity. Biochar-clay composites have shown high capacities for trapping microplastics in filtration experiments, and biochar derived from Solidago canadensis significantly enhanced soil enzyme activities and microbial biomass in soils contaminated with polyethylene and polylactic acid particles. Combined with conservation tillage, diverse crop rotations and carefully screened organic amendments, the review concludes, such strategies can buffer soils against the plastic burden already in the ground. But the authors are unequivocal that the deeper solution lies upstream: cutting avoidable plastic use, accelerating the transition to certified biodegradable alternatives, overhauling waste management and recycling infrastructure, and investing in the long-term ecological and toxicological research needed to quantify what the Plasticene era has quietly deposited on the world’s dinner plates.

Subject of Research: Microplastic and nanoplastic translocation from contaminated agricultural soils into food crops

Article Title: Assessing microplastic translocation from contaminated agricultural soils to food crops

Article References: Hayat, M. K., Arif, M., Turan, F., Mahmud, M. N., Batool, R., Cengiz, R., Tasnim, N., Shrabonti, R. M., & Billah, J. (2026). Assessing microplastic translocation from contaminated agricultural soils to food crops. Discover Soil, 3(1), Article 124. https://doi.org/10.1007/s44378-026-00281-2

Image Credits: AI Generated

DOI: 10.1007/s44378-026-00281-2

Keywords: microplastics, nanoplastics, agricultural soils, food crops, sewage sludge, plastic mulch, wastewater irrigation, soil health, plant uptake, food security, biochar, bioremediation

The scale of the problem begins with the sheer ubiquity of the particles themselves. Microplastics, generally defined as plastic fragments smaller than five millimeters, and nanoplastics, which measure below one micrometer, are generated through the fragmentation and degradation of larger plastic materials as well as through direct release from industrial and consumer sources. Once in the environment, these particles do not travel alone. The review emphasizes that they can interact with co-contaminants, including heavy metals and persistent organic pollutants, effectively acting as tiny rafts that concentrate other toxins. They may also alter fundamental environmental properties and biological processes in the soils where food is grown, changing the very substrate on which agriculture depends.

Plants sit at the critical interface between this environmental contamination and the food web. As primary producers, they are the first biological gate through which soil-borne plastics must pass on their way to herbivores and, ultimately, to humans. The review’s synthesis of experimental evidence indicates that both microplastics and nanoplastics can be taken up by plants through their roots, and under certain conditions through aerial tissues such as leaves. But the two size classes behave very differently. Nanoscale particles, by virtue of their diminutive dimensions, generally show a far greater potential for internalization into plant tissues and for subsequent redistribution to above-ground parts, the very portions of the plant that most often end up as food.

The technical explanation for this size-dependent behavior lies in plant anatomy. Root cell walls, with their porous structure, act as a physical sieve that excludes particles above a certain diameter while permitting much smaller particles to pass. Once inside the root, particles must navigate the endodermis, a selective barrier that normally regulates the flow of water and solutes into the vascular system. Nanoplastics small enough to breach these defenses can be transported through the xylem, the plant’s water-conducting plumbing, and deposited in stems, leaves, and fruits. This translocation pathway is what transforms a soil contamination problem into a food safety problem, because it places plastic particles directly into edible plant biomass rather than leaving them on surfaces that might be washed away.

What happens when animals consume these contaminated plants is the second half of the story, and it is here that the review is most careful to draw distinctions. Following ingestion, experimental studies indicate that nanoplastics in particular can cross biological barriers in the gut and reach tissues beyond the gastrointestinal tract. In some model organisms, exposure to these particles has been associated with oxidative stress, inflammatory responses, cellular damage, and alterations in physiological or behavioral endpoints. These findings are striking, and they have fueled viral headlines about plastics invading the bodies of virtually every organism studied. Yet the review’s authors urge restraint in interpretation, noting that the relevance of such laboratory findings to environmentally realistic exposure levels, and to human health specifically, remains uncertain.

This distinction between exposure and harm is one of the review’s central contributions. The authors place particular emphasis on separating three concepts that are often conflated in public discussion: evidence of exposure, meaning that particles are present in an organism; demonstrated trophic transfer, meaning that particles move from one organism to another through feeding; and bioaccumulation and biomagnification, meaning that particle concentrations increase within an organism or up the food chain. While plant uptake is now well supported experimentally, the extent to which plant-associated plastics subsequently undergo trophic transfer to animals under environmentally realistic conditions remains less well established. Much of the strongest evidence comes from controlled laboratory settings where particle concentrations, sizes, and polymer types may not reflect what animals actually encounter in a field or pasture.

The uncertainty stems from several interacting factors that the review dissects in detail. Particle size matters enormously, as the nanoscale fraction behaves fundamentally differently from larger microplastics. Physicochemical properties such as polymer type, surface charge, and the presence of additives and adsorbed pollutants shape how particles interact with biological membranes and immune systems. Environmental conditions, including soil chemistry, moisture, and the presence of other contaminants, influence both plant uptake and particle fate. And analytical limitations compound everything: detecting and characterizing micro- and nanoplastics in complex biological matrices remains technically difficult, and the lack of standardized methods makes it hard to compare results across studies or to distinguish genuine contamination from laboratory background noise.

The detection challenge deserves particular attention because it underpins every other conclusion in the field. Identifying plastic particles in plant roots, leaves, or animal tissue requires methods capable of confirming both the chemical identity of the polymer and the size and morphology of the particle, all at very low concentrations in matrices full of natural organic material. The review surveys the analytical approaches currently available and highlights how methodological inconsistency has produced a fragmented evidence base. Without standardized protocols, a study reporting high particle counts in one food item may not be comparable to a study reporting low counts in another, leaving regulators and the public without a clear picture of actual exposure levels in the diet.

Against this backdrop of uncertainty, the review also considers what can be done. The authors argue that improving the characterization of transfer pathways through standardized methods, environmentally realistic field studies, and interdisciplinary research spanning plant science, animal physiology, and analytical chemistry is essential for strengthening environmental risk assessment. Better science, they contend, will inform proportionate strategies for reducing plastic inputs and exposure across agricultural and terrestrial food systems. That word, proportionate, is telling. The goal is not to dismiss concern but to ensure that mitigation efforts, from reducing plastic mulch and packaging in agriculture to improving waste management, are targeted at the pathways and particle types that genuinely matter for exposure.

The broader significance of the review lies in its sober framing of a topic prone to alarm. There is no doubt that plastic particles are present in agricultural environments and that plants can take them up, with nanoplastics posing the greater internalization risk. There is also no doubt that these particles can cause biological effects in laboratory organisms at sufficient doses. What remains to be demonstrated, with the rigor that food safety policy demands, is how efficiently these particles move through real food chains, whether they accumulate to meaningful concentrations in animal tissues, and what, if any, consequences follow for human consumers. By mapping the pathways, cataloging the uncertainties, and calling for standardized and realistic research, Karimi, Seth, and Sinha have provided both a warning and a roadmap, one that acknowledges the genuine threat of plastic pollution while insisting that the next generation of studies be designed to answer the questions that matter most.

Subject of Research: Trophic transfer of micro- and nanoplastics from plants to animals in terrestrial food chains

Article Title: Pathways of micro- and nanoplastics transfer from plants to animals in the food chain

Article References: Karimi, J., Seth, S., & Sinha, R. (2026). Pathways of micro- and nanoplastics transfer from plants to animals in the food chain. Microplastics and Nanoplastics. https://doi.org/10.1186/s43591-026-00232-2

Image Credits: AI Generated

DOI: 10.1186/s43591-026-00232-2

Keywords: microplastics, nanoplastics, plant uptake, trophic transfer, food chain, food safety, bioaccumulation, soil ecosystem, ecotoxicology, risk assessment, Pathways, micro-