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From active defense to cross-kingdom alarm: Rhizosphere microenvironment remodeling in soybean under polylactic acid nanoplastics and cadmium Co-stress
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When soybean plants are exposed to both cadmium (a toxic heavy metal) and nanoplastics from "biodegradable" plastics at the same time, the two pollutants team up to stress the plant more than either would alone — triggering a chain reaction where the roots' chemical defenses, the surrounding soil, and soil microbes all shift in ways that create a feedback loop of worsening stress. This matters because soybeans are a major food crop, and understanding how these combined pollutants disrupt plant health from the roots up could help explain contamination risks in our food supply as both plastic pollution and heavy metal contamination increase in
As foundational components of the food web, plants face significant environmental threats caused by the coexistence of micro/nanoplastics (MNPs) and heavy metals. This study investigates the combined effects of cadmium and biodegradable polylactic acid nanoplastics on soybean. Under co-exposure conditions, toxicity progressively diminishes from the roots to the leaves of soybeans. By integrating root transcriptomics, root exudate metabolomics, rhizosphere soil metagenomics, and soil physicochemical analyses within a Bayesian structural equation modeling framework, we identified the Flavonoid biosynthesis pathway as a central mediating hub in the rhizosphere microenvironment under combined stress. Soybean roots modulated this pathway as a response strategy, which concurrently served as a signal for rhizosphere microbes to downregulate energy-intensive processes such as Methane metabolism, facilitating microbial adaptation. The down-regulation of the Flavonoid biosynthesis pathway in root exudates further altered rhizosphere soil properties, creating a feedback loop that amplified the expression of stress-related genes in soybean roots.
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Individual and Combined Effects of Nanoplastics and Cadmium on the Rhizosphere Bacterial Community of Sedum alfredii Hance
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When polystyrene nanoplastics and cadmium co-occur in soil, they act synergistically to disrupt the bacterial community around plant roots (rhizosphere), reducing the diversity of beneficial bacteria by more than what either pollutant does alone. High concentrations of nanoplastics combined with cadmium significantly increased the availability of cadmium in soil by 4%, potentially increasing uptake by plants. This matters for both food safety — since Sedum alfredii is used in phytoremediation of heavy-metal-contaminated sites — and for understanding how combined pollution stresses affect soil health.
Effects of polyethylene microplastics and cadmium co-contamination on the soybean-soil system: Integrated metabolic and rhizosphere microbial mechanisms
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Researchers investigated how polyethylene microplastics and cadmium interact in soybean-soil systems and found that specific microplastic concentrations enhanced cadmium accumulation in roots under moderate contamination. Higher microplastic levels reduced beneficial soil bacteria like Sphingomonas and Bradyrhizobium and suppressed nitrogen-cycling functions. The study demonstrates that microplastics fundamentally alter heavy metal behavior through interconnected plant-metabolite-microbe interactions in agricultural soils.
From single to combined stressors: Nanoplastic-ciprofloxacin synergy amplifies oxidative damage and metabolic dysregulation in Glycine max seedlings
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When soybean seedlings were exposed to both nanoplastics and the antibiotic ciprofloxacin together, the combined stress was significantly worse than either pollutant alone, stunting growth and disrupting key metabolic processes in the leaves. The nanoplastics reduced root growth and plant size, while the antibiotic primarily damaged leaf function, and together they overwhelmed the plants' antioxidant defenses. This matters for food safety because soybeans are a major crop, and agricultural environments increasingly contain both nanoplastics and antibiotic residues.
Beneficial microbial consortia effectively alleviated plant stress caused by the synergistic toxicity of microplastics and cadmium
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Researchers found that combined pollution from microplastics (PVC) and the heavy metal cadmium creates a toxic effect in soil that is worse than either pollutant alone. However, applying beneficial bacteria to contaminated soil helped plants grow better and restored soil nutrients. These findings suggest that probiotic-like bacteria could help repair farmland damaged by microplastic and heavy metal pollution.
Combined microplastic and cadmium pollution reshapes plastisphere–rhizosphere bacterial microbiomes and regulates the growth of sorghum plants for bioenergy
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Microplastics and toxic heavy metals like cadmium often pollute farmland together, and this study found that this combo stunts the growth of sorghum (a crop used for biofuel) more than either pollutant alone, especially when the plastic type is PVC. The silver lining: certain soil bacteria adapted to this pollution by evolving ways to break down plastic and resist heavy metals, and these bacteria actually helped the plants grow better despite the contamination, hinting at a possible future strategy for cleaning up polluted soil using plants and microbes together.
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