摘要

       抗生素耐药性 (AR) 已成为公共卫生的潜在问题。它主要与环境中抗生素的过度使用和滥用有关。有几个因素影响抗生素抗性基因 (ARG) 的发展和传播；然而，几乎没有描述这些因素的相对贡献。为了研究每个因素的影响，我们检查了五种抗生素、八种重金属、五种理化特性和细菌群落对冶炼厂附近收集的农业土壤中 310 种 ARG 丰度的影响。与其他四种抗生素相比，所有样品中四环素的含量最高，最严重的污染（1738.534 μg/kg）发生在离植物最远的样品（2556 m）中，而 ARG 的拷贝数最高（磺胺抗性基因，3.63 × 10-1 个拷贝/16SrRNA）和最严重的重金属污染（Cd，18.900 mg/kg；Pb，1938.000 mg/kg）在靠近植物的样品柜（741 米）中被检测到。 Pearson 和 Spearman 秩相关分析表明，土壤中 84 个 ARGs 的丰度受这四个因素的影响。细菌门贡献了 79.76% 的 ARGs 变异，而抗生素、重金属和理化性质分别贡献了 4.76%、1.19% 和 3.57%。细菌群落是影响ARGs分布的主要因素。抗生素和重金属不仅可以通过自身影响ARGs的分布，还可以通过影响土壤中细菌群落的结构来影响ARGs的分布。该研究提供了有关因素对 AR 控制的不同贡献的见解。

       Antibiotic resistance (AR) has become a potential concern to public health. It is mainly associated with the overuse and misuse of antibiotics in the environment. Several factors influence the development and dissemination of antibiotic resistance genes (ARGs); however, the relative contribution of these factors has been scarcely characterized. To study the impact of each factor, we examined the effects of five antibiotics, eight heavy metals, five physicochemical properties, and bacterial community on the abundance of 310 ARGs in agricultural soils collected near a smelter. Tetracycline was found in the highest levels of all the samples compared to the other four antibiotics, with the most severe contamination (1738.534 μg/kg) occurring in the sample farthest from the plant (2556 m), whereas the highest copy number of ARGs (sulfonamide resistance genes, 3.63 × 10−1 copies/16SrRNA) and the worst heavy metal pollution (Cd, 18.900 mg/kg; Pb, 1938.000 mg/kg) were detected in the sample closet to the plant (741 m). Pearson and Spearman rank correlation analysis showed that the abundance of 84 ARGs was impacted by these four factors in the soil. The bacterial phyla contributed to 79.76% of ARGs variation, whereas antibiotics, heavy metals, and physicochemical properties contributed 4.76%, 1.19%, and 3.57%, respectively. Bacterial community was the main factor influencing the distribution of ARGs. Antibiotics and heavy metals may affect the distribution of ARGs not only by themselves but also by influencing the structure of bacterial community in the soil. The research provides insights into the different contributions of factors to AR control.

https://www.sciencedirect.com/science/article/abs/pii/S1164556320303393