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Different Concentrations of Doxycycline in Swine Manure Affect the Microbiome and Degradation of Doxycycline Residue in Soil

文献类型： 外文期刊

作者： Yan, Qiufan 1 ; Li, Xiaoyang 1 ; Ma, Baohua 2 ; Zou, Yongde 2 ; Wang, Yan 1 ; Liao, Xindi 1 ; Liang, Junboo 6 ; Mi, Jiand 1 ;

作者机构： 1.South China Agr Univ, Coll Anim Sci, Natl Engn Res Ctr Breeding Swine Ind, Guangzhou, Guangdong, Peoples R China

2.Nanhai Entry Exit Inspect & Quarantine Bur, Foshan, Peoples R China

3.Guangdong Enterprise Lab Hlth Anim Husb & Environ, Yunfu, Peoples R China

4.South China Agr Univ, Key Lab Trop Agr Environm, Minist Agr, Guangzhou, Guangdong, Peoples R China

5.South China Agr Univ, Guangdong Prov Key Lab Agroanim Genom & Mol Breed, Guangzhou, Guangdong, Peoples R China

6.Univ Putra Malaysia, Inst Trop Agr, Lab Anim Prod, Serdang, Malaysia

7.Univ Putra Malaysia, Inst Biosci, Lab Mol Biomed, Serdang, Malaysia

关键词： doxycycline degradation; soil microbiome; interaction effect; resistance gene; swine manure

期刊名称：FRONTIERS IN MICROBIOLOGY （ 影响因子：5.64； 五年影响因子：6.32 ）

ISSN： 1664-302X

年卷期： 2018 年 9 卷

页码：

收录情况： SCI

摘要： Antibiotic residues that enter the soil through swine manure could disturb the number, community structure and functions of microbiota which could also degrade antibiotics in soil. Five different concentrations of doxycycline (DOX) incorporated into swine manure were added to soil to explore the effects of DOX on microbiota in soil and degradation itself. The results showed that the soil microbiome evolved an adaptation to the soil containing DOX by generating resistance genes. Moreover, some of the organisms within the soil microbiome played crucial roles in the degradation of DOX. The average degradation half-life of DOX in non-sterile groups was 13.85 +/- 0.45 days, which was significantly shorter than the 29.26 +/- 0.98 days in the group with sterilized soil (P < 0.01), indicating that the soil microbiome promoted DOX degradation. DOX addition affected the number of tetracycline resistance genes, depending on the type of gene and the DOX concentration. Among these genes, tetA, tetM, tetW, and tetX had significantly higher copy numbers when the concentration of DOX was higher. In contrast, a lower concentration of DOX had an inhibitory effect on tetG. At the same time, the microbial compositions were affected by the initial concentration of DOX and the different experimental periods. The soil chemical indicators also affected the microbial diversity changes, mainly because some microorganisms could survive in adversity and become dominant bacterial groups, such as the genera Vagococcus and Enterococcus (which were associated with electrical conductivity) and Caldicoprobacter spp. (which were positively correlated with pH). Our study mainly revealed soil microbiota and DOX degradation answered differently under variable concentrations of DOX mixed with swine manure in soil.

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