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The relationship between culturable doxycycline-resistant bacterial communities and antibiotic resistance gene hosts in pig farm wastewater treatment plants

文献类型： 外文期刊

作者： Yang, Yiwen 1 ; Chen, Yingxi 1 ; Cai, Yingfeng 1 ; Xing, Sicheng 1 ; Mi, Jiandui 1 ; Liao, Xindi 1 ;

作者机构： 1.South China Agr Univ, Coll Anim Sci, Guangdong Lab Lingnan Modern Agr, Guangzhou 510642, Peoples R China

2.South China Agr Univ, Coll Anim Sci, Natl Engn Res Ctr Breeding Swine Ind, Guangzhou 510642, Peoples R China

3.South China Agr Univ, Guangdong Prov Key Lab Agroanim Genom & Mol Breed, Guangzhou 510642, Peoples R China

4.South China Agr Univ, Key Lab Trop Agr Environm, Minist Agr, Guangzhou 510642, Peoples R China

关键词： Antimicrobial resistance gene (ARG); Resistant bacterial community (RBC); Wastewater treatment plant (WWTP); Doxycycline (DOX); Hosts; Pig farm

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.291； 五年影响因子：6.393 ）

ISSN： 0147-6513

年卷期： 2020 年 206 卷

页码：

收录情况： SCI

摘要： Pig farm wastewater treatment plants (WWTPs) are an important repository for resistant bacterial communities (RBCs) and antibiotic resistance genes (ARGs). However, the relationship between RBCs and ARG hosts has not been well characterized. In this study, water samples from influent and effluent from five pig farm WWTPs were collected. Gradient concentrations of doxycycline (DOX) were used to screen the culturable RBCs. The abundance of 21 subtypes of ARGs and the bacterial community were investigated. This study detected a large number of culturable DOX-RBCs and ARGs in the influent and effluent of pig farm WWTPs. The abundances of ARGs and RBCs in all effluent samples was significantly lower than that in the influent samples (P < 0.05), which indicated that the WWTPs can effectively remove most ARGs and RBCs in pig farm wastewater. The main potential culturable RBCs in pig farm wastewater were the dominant bacteria Proteobacteria, Actinobacteria, Pseudomonas, and Rheinheimera. However, most of the ARGs were mainly present in Bacteroidetes, Actinobacteria, Corynebacteriaceae, Macellibacteroides, Acinetobacter, and Enterobacteriaceae, which are considered potential ARG hosts. The results presented here showed that there were obvious differences between the species of culturable DOX-RBCs and ARG hosts in the pig farm WWTPs, which may be due to various environmental factors. This highlights the urgent need for further research on the relationship between RBCs and ARG hosts.

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