Repeated glyphosate exposure induces shifts in nitrifying communities and metabolism of phenylpropanoids

摘要: Abstract Glyphosate is the most used herbicide worldwide. Repeated applications are very common in field due to increasing incidence of glyphosate resistant (GR) weeds. Although several studies have considered effects single applications, information related with impact repeated on soil microbial communities comparatively less. We designed a laboratory experiment at microcosm level assess up three soils (H) and without history (NH) exposure herbicide. The overall bacterial community specific group, ammonia-oxidizing bacteria (AOB), were considered. Control microcosms (no glyphosate) those one, two or active ingredient (AI, N-(phosphonomethyl)glycine potassium salt) commercial formulation (CF, Roundup Full II) sampled after final application. A higher respiratory quotient (RQ) was detected p-coumaric acid as C source for (AI CF) relative control. Estimations abundance amoA gene (AOB) 16S rRNA (Eubacteria) using Quantitative Real Time PCR (qPCR) indicated no CF). However, significant differences CF when AOB Eubacteria. Additionally, shift structure either AI CF. Together these results reflect an groups involved key processes N cycling soil.