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

郑泽其; 李剑涛; 吴佳妮; 连加攀; 史瑞滢; 刘维涛

文章摘要

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

Received:August 18, 2021

DOI：10.13254/j.jare.2021.0535

中文关键词: 纳米金属颗粒，镉，玉米，植物毒性，植物修复

英文关键词: metal nanoparticles, cadmium, maize, phytotoxicity, phytoremediation

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

Author Name	Affiliation	E-mail
ZHENG Zeqi	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
LI Jiantao	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
WU Jiani	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
LIAN Jiapan	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
SHI Ruiying	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
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	lwt@nankai.edu.cn

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中文摘要:

为研究二氧化钛纳米颗粒（TiO₂ 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TiO₂ 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 TiO₂ 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 TiO₂ 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TiO₂ NPs的共同暴露下，随着TiO₂ 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 TiO₂ NPs显著提高了Cd的转运系数和Cd提取量。研究表明，TiO₂ NPs有望应用于强化植物修复土壤Cd污染。

英文摘要:

To study the effects of titanium dioxide nanoparticles（TiO₂ 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 TiO₂ 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 TiO₂ 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 TiO₂ 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 TiO₂ NPs, with the increase in TiO₂ 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 TiO₂ NPs significantly increased the translocation factor and the extraction amount of Cd. The results show that TiO₂ NPs could be used to enhance the phytoremediation of Cd-contaminated soil.

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