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Impacts of root exudates on the toxic response of Chrysanthemum coronarium L. to the co-pollution of nanoplastic particles and tetracycline
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Researchers grew Chrysanthemum coronarium under combined nanoplastic and tetracycline exposure and found synergistic oxidative damage and biomass reduction, with root exudates containing malic, oxalic, and formic acids found to partially alleviate toxicity by reducing reactive oxygen species levels.
Nano polystyrene (PS) particles and antibiotics universally co-exist, posing a threat to crop plants and hence human health, nevertheless, there is limited research on their combined toxic effects along with major influential factors, especially root exudates, on crop plants. This study aimed to investigate the response of Chrysanthemum coronarium L. to the co-pollution of nanoplastics and tetracycline (TC), as well as the effect of root exudates on this response. Based on a hydroponic experiment, the biochemical and physiological indices of Chrysanthemum coronarium L. were measured after 7 days of exposure. Results revealed that the co-pollution of TC and PS caused significant oxidative damage to the plants, resulting in reduced biomass. Amongst the two contaminants, TC played a more prominent role. PS could enter the root tissue, and the uptake of TC and PS by plant roots was synergetic. Malic acid, oxalic acid, and formic acid could explain 65.1% of the variation in biochemical parameters and biomass of the roots. These compounds affected the photosynthesis and biomass of Chrysanthemum coronarium L. by gradually lowering root reactive oxygen species (ROS) and leaf ROS. In contrast, the impact of rhizobacteria on the toxic response of the plants was relatively minor. These findings suggested that root exudates could alleviate the toxic response of plants to the co-pollution of TC and PS. This study enhances our understanding of the role of root exudates, providing insights for agricultural management and ensuring food safety.
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Researchers applied polystyrene nanoplastics of different surface charges to chrysanthemum leaves and found that positively charged particles most strongly reduced antibiotic (tetracycline) uptake, suppressed iron absorption and chlorophyll production, and increased oxidative damage — while also reshaping the plant's internal microbiome — demonstrating that atmospheric nanoplastic deposition can alter both contaminant bioavailability and plant health.
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Scientists found that when tiny plastic particles (nanoplastics) and a common antibiotic (tetracycline) show up together in soil, the plastic causes edible plants like garland chrysanthemum to absorb and hold onto more of the antibiotic residue in their roots. This combo also damaged the plant's root cells and reduced important nutrients like potassium, calcium, and iron. Since these pollutants often mix in real-world farming environments, this matters because it suggests microplastic pollution could make antibiotic contamination in our food worse while also making crops less nutritious.
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Researchers assembled synthetic microbial communities from nanoplastic-enriched root endophytes to protect poplar trees from nanoplastic toxicity. The study found that inoculation with these engineered microbial communities significantly improved plant growth, reduced nanoplastic accumulation, and alleviated oxidative damage through complementary strategies including detoxification, enhanced energy storage, and antioxidant defense pathways.
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