Transmission and retention of antibiotic resistance genes (ARGs) in chicken and sheep manure composting

被引:12
|
作者
Zhang, Wenming [1 ]
Yu, Chenxu [2 ]
Yin, Siqian [1 ]
Chang, Xinyi [1 ]
Chen, Kaishan [1 ]
Xing, Yanhong [1 ]
Yang, Yingxiang [1 ]
机构
[1] Gansu Agr Univ, Coll Resources & Environm Sci, Lanzhou 730070, Peoples R China
[2] Iowa State Univ, Dept Agr & Biosyst Engn, Ames, IA 50010 USA
关键词
Antibiotic resistance genes; Horizontal gene transfer; Mobile genetic elements; Host bacteria; Metagenomic sequencing; BACTERIAL COMMUNITY; PIG MANURE; BIODEGRADATION; DIVERSITY; REMOVAL;
D O I
10.1016/j.biortech.2023.129190
中图分类号
S2 [农业工程];
学科分类号
0828 ;
摘要
Transmission of ARGs during composting with different feedstocks (i.e., sheep manure (SM), chicken manure (CM) and mixed manure (MM, SM:CM = 3:1 ratio) was studied by metagenomic sequencing. 53 subtypes of ARGs for 22 types of antibiotics were identified as commonly present in these compost mixes; among them, CM had higher abundance of ARGs, 1.69 times than that in SM, while the whole elimination rate of CM, MM and SM were 55.2%, 54.7% and 42.9%, respectively. More than 50 subtypes of ARGs (with 8.6%, 11.4% and 20.9% abundance in the initial stage in CM, MM and SM composting) were "diehard" ARGs, and their abundance grew significantly to 56.5%, 63.2% and 69.9% at the mature stage. These "diehard" ARGs were transferred from initial hosts of pathogenic and/or probiotic bacteria to final hosts of thermophilic bacteria, by horizontal gene transfer (HGT) via mobile gene elements (MGEs), and became rooted in composting products.
引用
收藏
页数:11
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