PubMed · 2026-05-19
When nanoplastics and the weed-killer atrazine end up in water together, they actually interfere with each other's ability to harm plants — a surprising finding that complicates how we assess the risks of mixed chemical pollution in waterways and farm runoff.
Atrazine alone caused the most harm — increasing oxidative stress, stunting growth, and damaging leaf cells — while nanoplastics alone caused the least harm.
Combined exposure to nanoplastics and atrazine was antagonistic: catalase antioxidant enzyme activity increased 1.53-fold (PVC + atrazine) and 1.19-fold (PMMA + atrazine) compared to atrazine alone, indicating the plant's defenses were stronger under mixed exposure.
Root-dwelling bacteria (including the genus Sphingobium) were restructured by atrazine exposure and correlated with the plant's antioxidant responses, suggesting microbes inside plant roots play a role in mediating pollution tolerance.
