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| Effects of selenium on the growth and phytoremediation efficiency of Plantago asiatica L. in soil exposed to naphthalene |
| Received:April 18, 2019 |
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| KeyWord:selenium;naphthalene;Plantago asiatica L.;growth;physiological indexes;phytoremediation |
| Author Name | Affiliation | E-mail | | ZHU Can | College of Hydraulic&Environmental Engineering, China Three Gorges University, Yichang 443002, China
Hubei Engineering Technology Research Center for Farmland Environment Monitoring, China Three Gorges University, Yichang 443002, China
Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002, China | | | LIU Hui-gang | Hubei Engineering Technology Research Center for Farmland Environment Monitoring, China Three Gorges University, Yichang 443002, China
Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002, China | | | GU Yan | College of Hydraulic&Environmental Engineering, China Three Gorges University, Yichang 443002, China
Hubei Engineering Technology Research Center for Farmland Environment Monitoring, China Three Gorges University, Yichang 443002, China
Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002, China | | | XI Ying | Hubei Engineering Technology Research Center for Farmland Environment Monitoring, China Three Gorges University, Yichang 443002, China
Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002, China | | | REN Dong | Hubei Engineering Technology Research Center for Farmland Environment Monitoring, China Three Gorges University, Yichang 443002, China
Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002, China | | | HUANG Ying-ping | College of Hydraulic&Environmental Engineering, China Three Gorges University, Yichang 443002, China
Hubei Engineering Technology Research Center for Farmland Environment Monitoring, China Three Gorges University, Yichang 443002, China
Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002, China | chem_ctgu@126.com |
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| Abstract: |
| Pollution by polycyclic aromatic hydrocarbons(PAHs) is emerging as an acute global environmental issue. High-level contamination by PAHs can limit phytoremediation efficiency. In this work, naphthalene and Plantago asiatica L. were selected as a typical lowmolecular-weight PAH pollutant and a potential remediation plant, respectively. The effects of an exogenous substance, i.e., selenium(Se, 0.2 mg·kg-1), on the growth, physiological characteristics, and soil remediation efficiency of P. asiatica L. under exposure to different concentrations of naphthalene(0, 50, 200, and 800 mg·kg-1) were studied using pot simulation experiments. The results showed that biomass, root morphology(root surface area, root volume, root node number, and root mean diameter), and naphthalene removal efficiency decreased with an increase in naphthalene concentration in soil, whereas malondialdehyde(MDA) and glutathione(GSH) content and catalase(CAT) activity in the root increased. The addition of Se alleviated the stress of naphthalene and increased biomass and root morphogenesis by more than 10.7%, decreased MDA content by 8.4%~15.8%, and increased CAT activity by 4.0%~13.4% and GSH content by 13.1%~33.3% compared with the Se-free group. Selenium supplementation in the soil also increased PAH phytoremediation after 60 days of plant growth, and the removal ratio of naphthalene in the soil tended to rise by 0.5%~11.6% under different levels of naphthalene stress. A low concentration of Se enhanced plant tolerance toward naphthalene exposure by an alleviation of oxidative stress and an increase in biomass. Thus, the addition of Se is a good strategy for the phytoremediation of soils contaminated by PAHs in the field. |
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