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Pyraclostrobin-induced reproductive and intergenerational developmental toxicity in zebrafish: Modulatory effects of microplastics
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Researchers assessed the reproductive and intergenerational developmental toxicity of the fungicide pyraclostrobin in zebrafish, with and without polyethylene microplastic co-exposure. The study found that pyraclostrobin bioaccumulated in multiple tissues with the highest levels in the intestine and liver, and co-exposure with microplastics modulated its toxicity and maternal transfer potential.
Quinone outside inhibitor (QoI) fungicides are widely applied in agriculture for their high efficacy and broad-spectrum activity, raising ecological concerns. The reproductive and intergenerational toxicities of pyraclostrobin (PYR), a representative QoI fungicide, particularly when coexisting with emerging contaminants such as microplastics (MPs), remain inadequately characterized. In this study, adult zebrafish (Danio rerio) were employed to assess the reproductive toxicity and maternal transfer potential of PYR under single and combined exposure with polyethylene microplastics (PE-MPs). PYR exhibited tissue-specific bioaccumulation, with the highest concentrations detected in intestinal and hepatic tissues, followed by gills, brain, gonads, and muscle. Notably, co-exposure with PE-MPs altered PYR distribution by enhancing its accumulation in the intestine and gills, and reducing levels in the liver, brain, and gonads in a concentration-dependent manner. Both PYR and its combination with PE-MPs significantly impaired reproductive performance and intergenerational fitness, with effects extending to the F1 generation. Interestingly, combined exposure to PYR and PE-MPs attenuated some of these impairments observed with PYR alone, and aged PE-MPs (1.0 mg/L) induced less pronounced transcriptional disturbances than virgin MPs. This comprehensive analysis provides critical insights into the ecological risk assessment of QoI fungicides and their interaction with microplastic pollutants in aquatic ecosystems.
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Researchers studied how polyethylene microplastics affect the toxicity of the insecticide fipronil on developing zebrafish embryos. They found that while microplastics reduced the lethal effects of fipronil, likely by adsorbing some of the chemical, they did not change the rate of developmental abnormalities. The study highlights the complex ways different pollutants can interact in aquatic environments.
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This zebrafish study found that polystyrene microplastics made the herbicide acetochlor significantly more toxic to the reproductive system, and the damage was passed down to the next generation. The microplastics acted as carriers for the pesticide, increasing its absorption and worsening hormone disruption and fertility problems. This is concerning because both microplastics and agricultural chemicals are commonly found together in waterways, where their combined effects may be greater than previously understood.
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