Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 68, Issue 8, Pages 2457-2466Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.9b06634
Keywords
rhizosphere; antibiotic-resistant genes; manure; agricultural soil; low antibiotic concentration
Funding
- Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01Z134]
- National Natural Science Foundation of China [41807348, 41673111]
- Natural Science Foundation of Guangdong Province, China [2018A030313485]
- State Key Laboratory of Organic Geochemistry, GIGCAS [SKLOG-201733]
- Ten Thousand Talent Program of the Organization Department of the Central Committee of the CPC
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The influence of the rhizosphere on the abundance and diversity of antibiotic resistance genes (ARGs) has been recognized but there is a lack of consensus because of broad ranges of plant species and antibiotic concentrations across different habitats and the elusive underlying mechanisms. Here, we profiled antibiotic concentrations and resistomes in the rhizosphere and bulk soils by cultivating 10 types of crops in manure-amended agricultural soils. Rhizosphere effects altered the antibiotic resistome structure, significantly increased the absolute abundance of the antibiotic resistome, and decreased their relative abundance, contrasting previous studies. Such plantation-driven variation in ARGs resulted from the boost of bacterial lineages with negative relationships with ARGs and the constraint of the potential ARG-hosts in the rhizosphere of plants cultivated in soils with low antibiotic concentrations as the selective pressure. This mechanism is not reported previously and deepens our understanding about the rhizosphere effects on ARGs.
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