二氧化钛纳米颗粒对玉米幼苗吸收镉及其植物毒性的影响  

Impact of titanium dioxide nanoparticles on cadmium uptake in maize seedlings and its phytotoxicity

作　　者：郑泽其 李剑涛 吴佳妮 连加攀 史瑞滢 刘维涛[1] ZHENG Zeqi;LI Jiantao;WU Jiani;LIAN Jiapan;SHI Ruiying;LIU Weitao(Key Laboratory of Pollution Processes and Environmental Criteria,Ministry of Education/Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation,College of Environmental Science and Engineering,Nankai University,Tianjin 300350,China)

机构地区：[1]南开大学环境科学与工程学院污染过程与基准教育部重点实验室/天津市城市环境污染诊断与修复技术工程中心,天津300350

出　　处：《农业资源与环境学报》2022年第6期1217-1224,共8页Journal of Agricultural Resources and Environment

基　　金：国家自然科学基金项目(41471411);国家重点研发计划项目(2020YFC1808800)。

摘　　要：为研究二氧化钛纳米颗粒(TiO_(2)NPs)对镉(Cd)的植物毒性及吸收分布的影响,于2020年5—7月采用土壤盆栽试验,探究了不同浓度TiO_(2)NPs(0、50、200 mg·kg^(-1))和Cd(0、2、10、50 mg·kg^(-1))处理对玉米幼苗生长、叶绿素含量、抗氧化酶活性及Cd吸收的影响。结果表明:200 mg·kg^(-1)TiO_(2)NPs的施用可显著(P<0.05)提高50 mg·kg^(-1)Cd胁迫下玉米幼苗的干质量。在Cd浓度为50 mg·kg^(-1)时,外源添加200 mg·kg^(-1)TiO_(2)NPs可使玉米幼苗的叶绿素a和叶绿素b含量分别显著(P<0.05)增加42.48%和35.55%。在Cd和TiO_(2)NPs的共同暴露下,随着TiO_(2)NPs浓度的增加,超氧化物歧化酶(SOD)、抗坏血酸过氧化物酶(APX)、过氧化物酶(POD)的活性均逐渐增强。当Cd处理浓度为10 mg·kg^(-1)时,添加50 mg·kg^(-1)TiO_(2)NPs显著提高了Cd的转运系数和Cd提取量。研究表明,TiO_(2)NPs有望应用于强化植物修复土壤Cd污染。To study the effects of titanium dioxide nanoparticles(TiO_(2)NPs)on plant toxicity,uptake,and distribution of cadmium(Cd),a pot-culture experiment was conducted from May to July 2020.The effects of different concentrations of TiO_(2)NPs(0,50 mg·kg^(-1),and 200 mg·kg^(-1))and Cd(0,2,10 mg·kg^(-1),and 50 mg·kg^(-1))on growth,chlorophyll content,antioxidant enzyme activity,and Cd uptake in maize seedlings were investigated.The results showed that the application of 200 mg·kg^(-1)TiO_(2)NPs significantly(P<0.05)increased the dry weight of maize seedlings under 50 mg·kg^(-1)Cd stress.When the Cd concentration was 50 mg·kg^(-1),the exogenous addition of 200 mg·kg^(-1)TiO_(2)NPs significantly(P<0.05)enhanced chlorophyll a and b content by 42.48%and 35.55%,respectively.Under the co-exposure of Cd and TiO_(2)NPs,with the increase in TiO_(2)NPs concentration,the activities of SOD,APX,and POD gradually increased.When the concentration of Cd was 10 mg·kg^(-1),treatment with 50 mg·kg^(-1)TiO_(2)NPs significantly increased the translocation factor and the extraction amount of Cd.The results show that TiO_(2)NPs could be used to enhance the phytoremediation of Cd-contaminated soil.

关 键 词：纳米金属颗粒 镉 玉米 植物毒性 植物修复 

分 类 号：X173[环境科学与工程—环境科学] S513[农业科学—作物学]