[Microplastics-Induced Shifts of Diversity and Abundance of Antibiotic Resistance Genes in River Water].

Microplastics (MPs) and antibiotic resistance genes (ARGs) are both considered emerging contaminants of increasing concern because their combined pollution poses a serious risk to the ecological environment and human health. In this study, high-throughput quantitative PCR techniques were used to investigate the diversity and abundance of ARGs in river water, to which two different microplastics (PVC and PVA) were added for aerated incubation. The results showed that ARGs in river water were diverse, and microplastics could induce more types of ARGs. Although the number and abundance of ARGs decreased in all three treatments, which were cultivated for 14 d by aeration, compared to those in non-treated samples, the total abundance of ARGs in treatments aerated with MPs were higher than those aerated without MPs, especially in the samples treated with water-soluble microplastics (PVA). Significant correlations between the abundance of ARGs and mobile genetic elements (MGEs) were observed, implying that the occurrence of MGEs may potentially affect the transmission and distribution of ARGs through horizontal gene transfer (HGT) in river water.