Impact of TiO and ZnO Nanoparticles on Soil Bacteria and the Enantioselective Transformation of Racemic-Metalaxyl in Agricultural Soil with : A Wild Greenhouse Cultivation.

The effects of TiO and ZnO nanoparticles on soil bacteria and enantioselective transformation of racemic-metalaxyl (-metalaxyl) in agricultural soil with or without were investigated in an outdoor greenhouse. After a 70-day exposure to 2‰ ZnO, microbial biomass carbon decreased by 66% and bacterial community composition significantly changed. Meanwhile, ZnO decreased chlorophyll cumulation in by 34%. ZnO also inhibited the enantioselective transformation of metalaxyl enantiomers and changed the enantiomer fraction of metalaxyl. TiO showed similar effects but to a lesser extent. promoted the transformation of -metalaxyl and ingested TiO and ZnO. changed the bacterial co-occurrence networks and biomarkers in native soil and soil exposed to TiO and ZnO. reduced the inhibition effects of TiO and ZnO on the transformation of -metalaxyl. The decrease in the relative abundance of soil keystone taxa such as Acidobacteria and might respond to the corresponding slow transformation of -metalaxyl in soils exposed to TiO and ZnO, regardless of . Our results demonstrated the existence of mutual interactions among the impact of engineered nanoparticles on different components (microbes, plants, and coexisting pollutants) in the terrestrial ecosystem.