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Nanoplastic and nickel nanoparticles modulate soybean performance and nitrogen assimilation
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Tiny plastic particles (nanoplastics) building up in soil can seriously stress soybean plants, damaging their cells and cutting their growth by up to half, while a small dose of a metal nanoparticle (nickel oxide) actually helped the plants grow better and fix more nitrogen from the air. Since soybeans are a major food and animal feed crop, this research matters because it shows how plastic pollution in farmland could quietly shrink harvests, while also revealing that not all nanoparticles are harmful, some engineering approaches might even help crops cope with environmental stress.
The increasing release of nanoplastics (NPx) and engineered nanoparticles (NPs) into terrestrial ecosystems poses emerging risks to soil biota and the food chain. The effects of NPx contamination on soybean growth and N2 fixation potential in the presence of nickel oxide nanoparticles (NiO-NPs) remain poorly understood. This study investigated the accumulation and phytotoxicity of polystyrene nanoplastic (PS NPx) and NiO-NPs in soybean and their effects on nitrogen fixation potential. Single or co-application of NPx and NiO-NPs (100 mg kg-1) markedly reduced photosynthetic efficiency (8-48%), elevated biochemical stress markers (25-164%), downregulated phytohormone levels (13-54%), and negatively affected nitrogen fixation potential (19-35%), ultimately leading to reduced plant physiological growth (21-57%). This was due to PS-NPx accumulation in the leaves and structural abnormalities in vacuoles (including altered vacuole morphology), cell walls, mitochondria, and chloroplasts. In contrast, NiO-NPs at 50 mg kg-1 significantly increased nodule formation (16%) and biomass (20%), thereby enhancing N2-fixation (14%) in soybean plants. This improvement was attributed to the upregulation of N2 assimilation enzymes in nodules, roots, and shoots that promoted N2 content in the plant, resulting in increased plant growth. This study improves our understanding of the potential environmental risks associated with the accumulation of NPx and NiO-NPs in legumes crops and provides valuable scientific insights into their impacts on plant growth and N2 fixation in soybean.
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Assessing the combined impacts of microplastics and nickel oxide nanomaterials on soybean growth and nitrogen fixation potential
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This study tested how polystyrene microplastics and nickel oxide nanoparticles affect soybean growth and nitrogen fixation in soil. Microplastics alone reduced photosynthesis, plant hormones, and the beneficial root bacteria that help plants capture nitrogen from the air. While this is a plant and soil study, it demonstrates how microplastics can disrupt agricultural ecosystems that humans depend on for food production.
Nanoplastics Pollution Threatens Sustainable Nitrogen Fixation in Agroecosystems by Disrupting Legume–Rhizobium Symbiosis
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Tiny plastic particles (nanoplastics) can seriously interfere with the natural partnership between soybean plants and soil bacteria that pulls nitrogen from the air—a process crucial for plant growth and soil health without heavy fertilizer use. The smallest plastic particles tested caused the biggest damage, cutting nitrogen production by over half and stunting root nodule growth, which means more nanoplastic pollution in farm soil could eventually threaten crop yields and food supply. While this study looked at soil and plants rather than direct human health effects, it's a reminder that plastic pollution is working its way into the food system
Nanoplastic alters soybean microbiome across rhizocompartments level and symbiosis via flavonoid-mediated pathways
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Researchers applied polypropylene and polyethylene nanoplastics to soybean growing conditions and found that the particles altered soil chemistry, changed bacterial communities, and unexpectedly accelerated root nodule formation and nitrogen-fixing activity at lower doses. The effects varied by plastic type, with polyethylene nanoplastics having a stronger impact on soil enzyme activity. The study reveals that nanoplastic pollution can reshape the soil microbiome and influence how plants form beneficial partnerships with nitrogen-fixing bacteria.
Nanoplastics Pollution Threatens Sustainable Nitrogen Fixation in Agroecosystems by Disrupting Legume–Rhizobium Symbiosis
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Tiny plastic particles (nanoplastics) can get inside soybean plants and the helpful soil bacteria they depend on, seriously disrupting the natural process that converts air into plant fertilizer. The smallest plastic particles caused the most damage—cutting nitrogen production by half and shrinking the root nodules that support plant growth. Since this natural fertilization process is key to growing crops like soybeans without relying on chemical fertilizers, plastic pollution in soil could threaten food production and make our farming systems more dependent on synthetic fertilizers over time.
Role of Plant GrowthRegulators and Biological, Chemical,Nutrient, and Nanomaterial-Based Approaches in Mitigating Micro- andNanoplastic Stress in Agroecosystems
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Tiny plastic particles from pollution are building up in farm soil and can stunt crop growth, which matters because those crops end up on our plates. This review rounds up existing research on ways to fight back, showing that things like helpful soil bacteria, natural plant hormones, and nutrient treatments can help crops grow better and stay healthier even when contaminated with these plastics. While the solutions are promising, more research is still needed to turn these strategies into real-world farming practices that could ultimately mean less plastic contamination in our food supply.
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