数字农科院2.0

Temporal Effects Of Repeated Application Of Biogas Slurry On Soil Antibiotic Resistance Genes And Their Potential Bacterial Hosts

文献类型： 外文期刊

作者： Liu, C; Chen, YX; Li, XH; Zhang, YR; Ye, J; Huang, HK; Zhu, CX

作者机构：

关键词： Biogas Slurry; Soil; Antibiotics; Bacterial Community Composition; Args; Antimicrobial Resistance

期刊名称： ENVIRONMENTAL POLLUTION

ISSN： 0269-7491

年卷期： 2020 年 258 卷

页码：

收录情况： JCR（2021版） ; EI（2021版）

摘要： Biogas slurry, a liquid end product of animal manure fermentation, is widely used as fertilizer in crop fields. Land application may introduce antibiotics and related resistance genes from livestock production into agricultural soil. Nevertheless, changes in antimicrobial resistance in soil where biogas slurry has been repeatedly applied are not fully understood. In the present study, 13 veterinary antibiotics were analyzed in soils that were repeatedly sprayed with biogas slurry, and simultaneously, temporal changes in antibiotic resistance genes (ARGs) and bacterial community composition were investigated using a real-time quantitative PCR assay and MiSeq sequencing. Long-term repeated application of biogas slurry did not result in excessive accumulation of antibiotic residuals in the soil but increased the abundance of ARGs and facilitated ARG transfer among potential hosts. Although the quantitative PCR assay showed a decreasing trend for the relative abundance of ARGs over time, a relevance network analysis revealed highly complex bacteria-ARG co-occurrence after long-term application, which implied that repeated application might intensify horizontal gene transfer (HGT) of ARGs among different bacterial hosts in soil. The increased relative abundance of the intl1 gene supported the shift in ARG-bacteria co-occurrence. Furthermore, ordination analysis showed that the distributions of antibiotic resistance bacteria (ARB) and ARGs were closely related to application duration than to the influence of antibiotic residuals in the biogas slurry-treated soil environment. Additionally, natural level of ARG abundance in untreated soils indirectly suggested the presence/absence of antibiotics was not a key determinant causing the spread of antimicrobial resistance. This study provides improved insight into the effects of long-term repeated application of biogas slurry on the shift in ARG abundances and bacteria-ARG co-occurrence in soils, highlighting the need to focus on the influence of changed soil environment on the ARG transfer. (C) 2019 Elsevier Ltd. All rights reserved.

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