Composting reduces the risks of antibiotic resistance genes in maize seeds posed by gentamicin fermentation waste

文献类型： 外文期刊

第一作者： Liu, Yuanwang

作者： Liu, Yuanwang;Feng, Minmin;Liu, Yuanwang;Feng, Yao;Li, Zhaojun;Johansen, Anders;Cheng, Dengmiao;Xue, Jianming;Xue, Jianming;Fan, Shuanghu

作者机构：

关键词： Antibiotic fermentation waste; Endophyte; High-throughput quantitative PCR; Bacterial community; Mobile genetic element

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：9.8； 五年影响因子：9.6 ）

ISSN： 0048-9697

年卷期： 2023 年 870 卷

页码：

收录情况： SCI

摘要： Using high-throughput quantitative PCR and next generation sequencing, the impact of land application of raw and composted gentamicin fermentation waste (GFW) on antibiotic resistance genes (ARGs) in maize seeds was studied in a three-year field trial. The raw and composted GFW changed both the bacterial community composition and the ARGs diversity in the maize seeds compared to non-amended controls and chemical fertilizer. The abundance of ARGs after raw GFW amendment was significantly higher than other treatments because of a high abundance of aadA1, qacEdeltal and aph(2 ')-Id-02; probably induced by gentamicin selection pressure in maize tissues. Meanwhile, the potential host of these three ARGs, pathogenic bacteria Tenacibaculum, also increased significantly in maize seeds after the application of raw GFW. But our result proved that composting could weaken the risk posed by GFW. We further reveal that the key biotic driver for shaping the ARG profiles in maize seeds is bacterial community followed by heavy metal resistance genes, and ARGs are more likely located on bacterial chromosomes. Our findings provide new insight into ARGs dispersal mechanism in maize seeds after long-term GFW application, demonstrate the potential benefits of composting the GFW to reduce risks as well as the potential efficient management method to GFW.

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