期刊
BIORESOURCE TECHNOLOGY
卷 351, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127007
关键词
Bacteriophage antibiotic resistance genes; Extracellular antibiotic resistance genes; Hosts; Mesophilic anaerobic digestion; Thermophilic anaerobic digestion
资金
- Special funds for the major science and technology of Shaanxi Province [2020zdzx03-02-01]
- Shaanxi Key Research and Development Projects [2019ZDLNY01-01]
- Shaanxi Innovation Capability Support Program [2020PT-015, 2019PT-13]
- National key research and development program of China [2021YFD1600400]
- China Postdoctoral Science Foundation [BX20200281]
This study investigated the characteristics of intracellular antibiotic resistance genes (iARGs), extracellular ARGs (eARGs) and bacteriophage ARGs (bARGs) during mesophilic and thermophilic anaerobic digestion of cow manure. The results showed a significant decrease in the abundance of iARGs and an increase in the abundance of eARGs and bARGs, with eARGs mainly derived from the non-specific lysis of Firmicutes and Bacteroidetes.
The fate of intracellular antibiotic resistance genes (iARGs), extracellular ARGs (eARGs) and bacteriophage ARGs (bARGs) during anaerobic digestion (AD) of cow manure is unclear. Thus, the characteristics of iARGs, eARGs and bARGs during mesophilic AD (MAD) and thermophilic AD (TAD) of cow manure were investigated. The absolute abundances of iARGs decreased by 69.82% after TAD. After MAD and TAD, the total absolute abundances of eARGs increased by 63.5 times and 67.6 times, respectively, whereas those of the bARGs increased by 47.60% and 59.22%. eARGs were mainly derived from the non-specific lysis of Firmicutes, Bacteroidetes, while bacteriophages had a wide range of hosts. The variations in iARGs, eARGs and bARGs were affected by the microbial hosts but also directly driven by physicochemical factors (e.g., pH). Overall, the findings of this study revealed that there may be a risk of eARGs and bARGs disseminating during the AD of cow manure.
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