Accumulation of phenanthrene and its metabolites in lettuce (Lactuca sativa L.) as affected by magnetic carbon nanotubes and dissolved humic acids,Environmental Science: Nano

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Accumulation of phenanthrene and its metabolites in lettuce (Lactuca sativa L.) as affected by magnetic carbon nanotubes and dissolved humic acids
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2020-10-27 , DOI: 10.1039/d0en00932f
Weili Jia _{1,

2,

3,

4,

5} , Chuanxin Ma _{6,

7,

8,

9,

10} , Mengfei Yin _{1,

2,

3,

4,

5} , Hongwen Sun _{1,

2,

3,

4,

5} , Qing Zhao _{10,

11,

12,

13,

14} , Jason C. White _{15,

16,

17} , Cuiping Wang _{1,

2,

3,

4,

5} , Baoshan Xing _{17,

18,

19,

20}

Affiliation

Key Laboratory of Pollution Processes and Environmental Criteria
Ministry of Education
Tianjin Key Laboratory of Environmental Remediation and Pollution Control
College of Environmental Science and Engineering
Nankai University
Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education
Institute of Environmental and Ecological Engineering
Guangdong University of Technology
Guangzhou 510006
China
Key Laboratory of Pollution Ecology and Environmental Engineering Institute of Applied Ecology
Institute of Applied Ecology
Chinese Academy of Sciences
Shenyang 110016
The Connecticut Agricultural Experiment Station
New Haven
USA
Stockbridge School of Agriculture
University of Massachusetts
Amherst

This study investigated the behavior of phenanthrene (Phe) in lettuce (Lactuca sativa L.) as affected by carbon nanotubes (CNTs)/magnetic carbon nanotubes (MCNTs) and dissolved humic acids (DHAs) under hydroponic conditions for 10 days. MCNTs alone or combined with DHAs reduced Phe accumulation in roots by more than 50%; in shoots, CNTs increased the Phe accumulation from 72.1 to 114.8%, regardless of the presence of DHAs. DHAs decreased the total Phe metabolites content in lettuce by 21.7–98.9%. Nine Phe-related metabolites were identified and a possible Phe metabolism pathway in lettuce was proposed. A positive correlation was found between Fe and Phe content in lettuce under treatments of MCNTs/CNTs combined with DHA1, indicating exogenous Fe in conjunction with DHA1 affected Phe accumulation in lettuce. Additionally, MCNTs/CNTs and DHAs reduced Phe-induced toxicity to lettuce by elevating the activity of shoot glutathione S-transferase (GST). The addition of MCNTs/CNTs alone and combination with DHAs enhanced photosynthesis. The upregulation of genes related to photosynthesis and carotenoid biosynthesis in the treatments with DHAs or the combinations of CNT/MCNTs and DHAs alleviated Phe-induced phytotoxicity and negative impacts on photosynthesis. Our findings provide important information on Phe accumulation and its metabolism in plant–soil systems and on the roles of DHAs and MCNTs in alleviating the contaminant-induced phytotoxicity.

中文翻译：

受磁性碳纳米管和可溶性腐殖酸影响的莴苣中菲及其代谢物的积累

本研究在调查生菜菲丙氨酸（Phe）的行为（莴苣在水培条件下受碳纳米管（CNT）/磁性碳纳米管（MCNT）和溶解的腐殖酸（DHA）影响10天。单独或与DHA结合使用MCNT可以减少根中Phe的积累50％以上；在芽中，无论是否存在DHA，CNT都会将Phe积累从72.1增加到114.8％。DHA使生菜中的总Phe代谢物含量降低了21.7–98.9％。鉴定了9种Phe相关代谢物，并提出了莴苣中Phe可能的代谢途径。MCNTs / CNTs结合DHA1处理后，莴苣中的Fe和Phe含量呈正相关，表明外源Fe与DHA1结合会影响生菜中Phe的积累。此外，MCNTs / CNTs和DHAs通过提高芽谷胱甘肽的活性来降低Phe诱导的对莴苣的毒性S-转移酶（GST）。单独添加MCNT / CNT并与DHA结合使用可增强光合作用。在DHA或CNT / MCNT和DHA的组合中，与光合作用和类胡萝卜素生物合成相关的基因上调可减轻Phe诱导的植物毒性和对光合作用的负面影响。我们的发现为植物体内土壤中Phe的积累及其代谢以及DHA和MCNT在减轻污染物引起的植物毒性中的作用提供了重要信息。

更新日期：2020-11-03

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