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Jechalke, S.* ; Radl, V. ; Schloter, M. ; Heuer, H.* ; Smalla, K.*

Do drying and rewetting cycles modulate effects of sulfadiazine spiked manure in soil?

FEMS Microbiol. Ecol. 92:fiw066 (2016)

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Naturally occurring drying-rewetting events in soil have been shown to affect the dissipation of veterinary antibiotics entering soil by manure fertilization. However, knowledge of effects on the soil microbial community structure and resistome is scarce.Here, consequences of drying-rewetting cycles on effects of sulfadiazine (SDZ) in soil planted withDactylis glomerataL. were investigated in microcosms. Manure containing SDZ or not was applied to the pregrown grass and incubated for 56 days in a climate chamber. Water was added either daily or was reduced during two drying events of seven days, each followed by a recovery phase. Total community DNA was analyzed to reveal effects on the bacterial community structure and on the abundance ofsul1,sul2,intI1,intI2,qacE+qacEΔ1,traNandkorBgenes relative to 16S rRNA genes.16S rRNA gene based DGGE fingerprints indicated that drying-rewetting cycles modulated effects of SDZ on the bacterial community structure in the soil. Furthermore, the SDZ treatment increased the relative abundance of sulfonamide resistance and integrase genes compared to the control. However, this increase was not different between moisture regimes, indicating that drying-rewetting had only a negligible effect on the selection of the resistome by SDZ in the manured soil.

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