School of Resources and Environmental Science, Wuhan University, Wuhan 430079, China.
Hubei Jingzhou Environmental Protection Science and Technology Co., Ltd, Jingzhou 434000, China.
J Agric Food Chem. 2020 Oct 7;68(40):11242-11252. doi: 10.1021/acs.jafc.0c03959. Epub 2020 Sep 29.
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.
研究了 TiO 和 ZnO 纳米颗粒对农业土壤中土壤细菌的影响，以及在有无共存污染物 的情况下，这些纳米颗粒对半衰期金属axyl（-金属axyl）的对映选择性转化的影响。在暴露于 2‰ ZnO 70 天后，微生物生物量碳减少了 66%，细菌群落组成发生了显著变化。同时，ZnO 使 的叶绿素积累减少了 34%。ZnO 还抑制了金属axyl 对映体的对映选择性转化，并改变了金属axyl 的对映体分数。TiO 表现出类似的但程度较小的影响。 促进了 -金属axyl 的转化，并摄取了 TiO 和 ZnO。 改变了土著土壤和暴露于 TiO 和 ZnO 的土壤中的细菌共现网络和生物标志物。 降低了 TiO 和 ZnO 对 -金属axyl 转化的抑制作用。土壤关键类群（如 Acidobacteria 和 ）的相对丰度下降可能是由于 TiO 和 ZnO 暴露土壤中 -金属axyl 的相应缓慢转化所致，而 则无关紧要。我们的结果表明，工程纳米颗粒对陆地生态系统中不同成分（微生物、植物和共存污染物）的影响之间存在相互作用。
