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Nanoplastics Pollution Threatens Sustainable Nitrogen Fixation in Agroecosystems by Disrupting Legume–Rhizobium Symbiosis
Original title: 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.
The rhizobium–legume symbiosis plays a vital role in the global nitrogen cycle. Although microplastics have been shown to affect this symbiotic system, the accumulation and impacts of nanoplastics (NPs) in rhizobia and their root nodules remain poorly understood, particularly regarding the interactive effects of NPs of different sizes on symbiotic nitrogen fixation. This study demonstrated that polystyrene (PS) NPs exhibited a significant size difference effect on rhizobia and their symbiotic nitrogen-fixing association with soybean ( Glycine max ). We found that both rhizobia and soybean nodules efficiently internalized PS NPs, with differently sized NPs showing mutual enhancement during the cellular uptake of rhizobia. 100 mg/kg of 20 nm PS NPs severely disrupted the symbiotic nitrogen fixation, reducing nitrogenase activity by 51.3% in single exposures and 28.6% in combined exposure to 200 nm PS NPs. This observed disruption caused by 20 nm PS NPs was associated with suppressed nodule formation (26.0% reduction in number, 50.4% decrease in fresh biomass), diminished leghemoglobin content (64.9% reduction), impaired nutrient acquisition (26.5% decrease in nodule Mo content), reduced rhizobia infection efficiency, impaired plant growth, and modified expression of nodulation- and nitrogen-fixation-related genes. These findings revealed that small-sized PS NPs posed a substantial threat to the rhizobium–legume symbiosis, underscoring the ecological risks of NP pollution in agricultural systems.
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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
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