"Global profiling of antibiotic resistomes in maize rhizospheres" by Dung Ngoc Pham, Qiong Wu et al.
 

Global profiling of antibiotic resistomes in maize rhizospheres

Document Type

Article

Publication Date

3-1-2023

Abstract

The spreading of antimicrobial resistance (AMR) in crops and food products represents a global concern. In this study, we conducted a survey of resistomes in maize rhizosphere from Michigan, California, the Netherlands, and South Africa, and investigated potential associations with host bacteria and soil management practices in the crop field. For comparison, relative abundance of antibiotic resistance genes (ARGs) is normalized to the size of individual metagenomes. Michigan maize rhizosphere metagenomes showed the highest abundance and diversity of ARGs, with the detection of blaTEM-116, blaACT-4/-6, and FosA2, exhibiting high similarity (≥ 99.0%) to those in animal and human pathogens. This was probably related to the decade-long application of manure/composted manure from antibiotic-treated animals. Moreover, RbpA, vanRO, mtrA, and dfrB were prevalently found across most studied regions, implying their intrinsic origins. Further analysis revealed that RbpA, vanRO, and mtrA are mainly harbored by native Actinobacteria with low mobility since mobile genetic elements were rarely found in their flanking regions. Notably, a group of dfrB genes are adjacent to the recombination binding sites (attC), which together constitute mobile gene cassettes, promoting the transmission from soil bacteria to human pathogens. These results suggest that maize rhizosphere resistomes can be distinctive and affected by many factors, particularly those relevant to agricultural practices.

Identifier

85147948079 (Scopus)

Publication Title

Archives of Microbiology

External Full Text Location

https://doi.org/10.1007/s00203-023-03424-z

e-ISSN

1432072X

ISSN

03028933

PubMed ID

36781495

Issue

3

Volume

205

Grant

1903597

Fund Ref

Michigan State University

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