Tetracycline and sulfamethazine alter dissimilatory nitrate reduction processes and increase N2 O release in rice fields

Environmental Pollution
Jun ShanXiaoyuan Yan

Abstract

Effects of antibiotics on the transformation of nitrate and the associated N2O release in paddy fields are obscure. Using soil slurry experiments combined with 15N tracer techniques, the influence of tetracycline and sulfamethazine (applied alone and in combination) on the denitrification, anaerobic ammonium oxidation (anammox), dissimilatory nitrate reduction to ammonium (DNRA) and N2O release rates in the paddy soil were investigated, while genes related to nitrate reduction and antibiotic resistance were quantified to explore the microbial mechanisms behind the antibiotics' effects. The potential rates of denitrification, anammox, and DNRA were significantly (p < 0.05) reduced, which were mainly attributed to the inhibitory effects of the antibiotics on nitrate-reducing microbes. However, the N2O release rates were significantly (p < 0.05) stimulated by the antibiotic treatments (0.6-6000 μg kg-1 soil dry weight), which were caused by the different inhibition effects of antibiotics on N2O production and N2O reduction as suggest by the changes in abundance of nirS (nitrite reduction step) and nosZ (N2O reduction to N2 step) genes. Antibiotic resistance gene (tetA, tetG, sulI, and sulIII) abundances were significantly (p < 0.0...Continue Reading

Citations

Aug 14, 2019·Environmental Science. Processes & Impacts·Hua ZouXiang-Yu Guan
Mar 12, 2020·Environmental Science and Pollution Research International·Xiaoxuan SuQiang He
Aug 20, 2019·The Science of the Total Environment·Zuzana BílkováKarel Hrich
Aug 16, 2019·The Science of the Total Environment·Shuntao ChenJun Shan
Nov 22, 2019·European Journal of Pharmacology·Ewa FelisEwa Korzeniewska
Feb 13, 2021·Environmental Pollution·Rayane Kunert LangbehnHugo Moreira Soares
Feb 10, 2020·The Science of the Total Environment·Stephanie L DeVriesPengfei Zhang
Mar 26, 2021·Environmental Science and Pollution Research International·Sakina BombaywalaSunil Kumar
Jan 27, 2019·Environment International·Mohit KumarPratyoosh Shukla

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