二氧化钛纳米颗粒对大豆根部吸收芘的影响  

Effect of titanium dioxide nanoparticles on the uptake of pyrene by soybean(Glycine max L.)roots

作　　者：马晓玥 袁彬彬 方国东[1] 高娟[1] 周东美[1] MA Xiao-yue;YUAN Bin-bin;FANG Guo-dong;GAO Juan;ZHOU Dong-mei(Institute of Soil Science,Chinese Academy of Science,Nanjing 210008,China;University of Chinese Academy of Sciences,Beijing 100864,China)

机构地区：[1]中国科学院南京土壤研究所,南京210008 [2]中国科学院大学,北京100864

出　　处：《农业环境科学学报》2020年第12期2719-2725,共7页Journal of Agro-Environment Science

基　　金：国家重点研发计划项目(2017YFA0207000)。

摘　　要：为研究纳米颗粒(NPs)对植物根部吸收与累积多环芳烃(PAHs)的影响,分别选择TiO2 NPs、芘作为NPs和PAHs的代表,对大豆植株根部进行不同的处理。结果表明:芘的存在使大豆根部钛含量增加了82.3%,但TiO2 NPs的添加显著抑制了大豆根部对芘的吸收与累积,使大豆根部芘的累积量降低了97.1%;在芘的胁迫下,TiO2 NPs的存在未能减轻大豆根部的脂质过氧化作用,对大豆根部的超氧化物歧化酶(SOD)活性没有显著影响,而显著减少了大豆根部谷胱甘肽(GSH)的含量。Nanoparticles(NPs)have excellent physicochemical properties,but research on the effect of NPs on the uptake and accumulation of polycyclic aromatic hydrocarbons(PAHs)by plant roots is still limited.In this study,the roots of soybean were exposed to TiO2 NPs and pyrene,which were selected as the representative NPs and PAHs,respectively,or both.The results showed that the content of Ti ions in soybean roots increased by 82.3%in the presence of pyrene,but the addition of TiO2 NPs significantly inhibited the uptake and accumulation of pyrene by soybean roots,and hence,the accumulation of pyrene in soybean roots decreased by 97.1%.Under pyrene stress,the presence of TiO2 NPs did not reduce the lipid peroxidation of soybean roots and had no significant effect on the activity of superoxide dismutase(SOD),but significantly reduced the content of glutathione(GSH)in soybean roots.This study provides a theoretical basis for understanding inhibition of the uptake of PAHs by plants and provides a new idea for safe production of agricultural products.

关 键 词：二氧化钛纳米颗粒 芘 大豆 吸收 抗氧化作用 

分 类 号：X173[环境科学与工程—环境科学]