数字农科院2.0

Case study on the relationship between transmission of antibiotic resistance genes and microbial community under freeze-thaw cycle on cold-region dairy farm

文献类型： 外文期刊

作者： Fanzi Kong;Zheng Qi;Hailong Tong;Nanqi Ren;Shijie You

作者机构：

关键词： Antibiotic resistance genes;Firmicutes;Freeze-thaw cycle;Microbial community;Mobile genetic elements

期刊名称： Science of the Total Environment

ISSN： 0048-9697

年卷期： 2024 年 952 卷

页码：

收录情况： SCIE（2024版） ; ; EI（2024版）

摘要： Freeze-thaw cycle (FTC) is a naturally occurring phenomenon in high-latitude terrestrial ecosystems, which may exert influence on distribution and evolution of microbial community in the soil. The relationship between transmission of antibiotic resistance genes (ARGs) and microbial community was investigated upon the case study on the soil of cold-region dairy farm under seasonal FTC. The results demonstrated that 37 ARGs underwent decrease in the abundance of blaTEM from 80.4 % for frozen soil to 71.7 % for thawed soil, and that sul2 from 8.8 % for frozen soil to 6.5 % for thawed soil, respectively. Antibiotic deactivation was identified to be closely related to the highest relative abundance of blaTEM, and the spread of sulfonamide resistance genes (SRGs) occurred mainly via target modification. Firmicutes in frozen soil were responsible for dominating the abundance of ARGs by suppressing the native bacteria under starvation effect in cold regions, and then underwent horizontal gene transfer (HGT) among native bacteria through mobile genetic elements (MGEs). The TRB-C (32.6–49.1 %) and tnpA-06 (0.27–7.5 %) were significantly increased in frozen soil, while Int3 (0.67–10.6 %) and tnpA-04 (11.1–19.4 %) were up-regulated in thawed soil. Moreover, the ARGs in frozen soil primarily underwent HGT through MGEs, i.e. TRB-C and tnpA-06, with increased number of Firmicutes serving as carrier. The case study not only demonstrated relationship between transmission of ARGs and microbial community in the soil under practically relevant FTC condition, but also emphasized the importance for formulating better strategies for preventing FTC-induced ARGs in dairy farm in cold regions.

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