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The changes in antibiotic resistance genes during 86 years of the soil ripening process without anthropogenic activities.

Abstract：

:This study aimed to reveal the baseline of natural variations in antibiotic resistance genes (ARGs) in soil without anthropogenic activities over the decades. Nine soil samples with different time of soil formation were taken from the Yancheng Wetland National Nature Reserve, China. ARGs and mobile genetic elements (MGEs) were characterized using metagenomic analysis. A total of 196 and 192 subtypes of ARGs were detected in bulk soil and rhizosphere, respectively. The diversity and abundance of ARGs were stable during 69 years probably due to the alkaline pH soil environment but not due to antibiotics. Increases in ARGs after 86 years were probably attributed to more migrant birds inhabited compared with other sampling sites. Multidrug was the most abundant type, and largely shared by soil samples. It was further shown that soil samples could not be clearly distinguished, suggesting a slow process of succession of ARGs in the mudflat. The variation partitioning analysis revealed that the ARG profile was driven by the comprehensive effects exhibited by the bacterial community, MGEs, and environmental factors. Besides, pathogenic bacteria containing ARGs mediated by migrant birds in the area with 86 years of soil formation history nearing human settlements needed special attention. This study revealed the slow variations in ARGs in the soil ripening process without anthropogenic activities over decades, and it provided information for assessing the effect of human activities on the occurrence and dissemination of ARGs.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Tang X,Shen M,Zhang Y,Zhu D,Wang H,Zhao Y,Kang Y

doi

10.1016/j.chemosphere.2020.128985

subject

Has Abstract

pub_date

2021-03-01 00:00:00

pages

128985

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(20)33182-9

journal_volume

266

pub_type

杂志文章

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