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Freeze–Thaw Cycles Accelerate Plastic Pollution Invasion in Agriculture: Trojan Horse Effect of Microplastic–Plasticizer Contamination Revealed in Rye via Computational Chemistry and Multiomics
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Researchers found that climate change-related freeze-thaw cycles significantly worsen the combined toxicity of the plasticizer DEP and microplastics in rye plants. Freeze-thaw conditions increased microplastic uptake into plants by altering particle surface charge, while DEP bound to key plant proteins and inhibited photosynthesis. The study reveals that microplastics simultaneously acted as carriers for the plasticizer while reshaping root microbiomes to favor pollutant-degrading bacteria.
Climate change-related freeze-thaw (FT) cycles intensify combined contamination from diethyl phthalate (DEP) and microplastics (MPs) in agricultural systems. This study examines their synergistic phytotoxicity in hydroponic rye using multidisciplinary approaches, including physiology, transcriptomics, and computational modeling. FT dramatically increased cocontamination risks. Notably, DEP promoted MP uptake into plants by elevating MP surface charge─an effect intensified by FT─resulting in disrupted root function and nutrient absorption. Molecular analyses showed that DEP binds strongly to key proteins (e.g., HSP70; ΔG = -7.6 kcal/mol), inhibiting photosynthesis (net rate reduced by 20.1-64.5%) and altering antioxidant activity. MPs adsorbed DEP, reducing its mobility, while simultaneously reshaping the root microbiome to favor DEP-degrading bacteria (e.g., Rhizobium). Transcriptomic changes were observed in stress-responsive and phytohormone pathways. These results demonstrate that FT cycles exacerbate combined pollutant toxicity through surface charge modification, molecular disruption, and microbial community adaptation, offering important insights for assessing ecological risks under climate-induced stressors.
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Freeze–ThawCycles Accelerate Plastic PollutionInvasion in Agriculture: Trojan Horse Effect of Microplastic–PlasticizerContamination Revealed in Rye via Computational Chemistry and Multiomics
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Using hydroponic rye as a model, researchers showed that freeze-thaw cycles dramatically increased diethyl phthalate uptake into plants in the presence of microplastics, with the plasticizer boosting microplastic surface charge and facilitating plant entry. Transcriptomic and computational analyses revealed disruption of gene networks governing growth and stress response.
Toxicity of Polystyrene Nanoplastics and Tributyl Phosphate to Rye under Freeze–Thaw Cycles: Implications for Crop Safety and Mechanistic Insights from Transcriptome and Root Microbiome
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Researchers exposed rye to combined polystyrene nanoplastics and the plasticizer tributyl phosphate under simulated freeze-thaw cycles, finding that cold cycling intensifies oxidative stress and photosynthesis suppression by promoting physicochemical complex formation between pollutants, restructuring root endophytic microbiomes, and activating jasmonic acid and abscisic acid defense signaling pathways.
Molecular Trojan Effect of Microplastic Diethyl Phthalate Drives Multiscale Stress Vortex through Interfacial Engineering in Cold Agroecosystems during Freeze–Thaw Cycles
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In a 120-day full-lifecycle soil cultivation experiment, researchers combined microplastic diethyl phthalate with freeze-thaw cycles to simulate cold agroecosystem conditions, and used molecular dynamics and multi-omics to characterize the resulting plant and soil stress. The plastic additive caused compounding oxidative and hormonal stress in plants that was amplified under freeze-thaw conditions, revealing a novel "Trojan effect" in cold-climate agricultural soils.
Metabolomic insights into the synergistic effects of nanoplastics and freeze-thaw cycles on Secale cereale L. seedling physiology
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Researchers exposed rye seedlings simultaneously to polystyrene nanoplastics and simulated freeze-thaw cycles, finding that the combination amplified oxidative stress, inhibited photosynthesis, and disrupted core metabolic pathways — including the TCA cycle and lipid metabolism — more severely than either stressor alone.
The freeze-thaw cycle exacerbates the ecotoxicity of polystyrene nanoplastics to Secale cereale L. seedlings
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Researchers exposed rye seedlings to polystyrene nanoplastics followed by repeated freeze-thaw cycles (simulating cold climate conditions), finding that temperature cycling significantly increased nanoplastic accumulation within plant tissues, damaged chloroplasts, inhibited photosynthesis, and amplified oxidative stress beyond the effects of nanoplastics or freeze-thaw stress alone.
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