Huang Yingping, Huang Jueying, Song Yizhi, Liu Huigang
Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002, PR China.
Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002, PR China.
Ecotoxicol Environ Saf. 2017 Sep;143:1-5. doi: 10.1016/j.ecoenv.2017.05.001. Epub 2017 May 5.
Polycyclic aromatic hydrocarbons (PAHs) are among the most dangerous of environmental contaminants, due to their toxicity, carcinogenicity and mutagenicity. This study investigated the use of selenium (Se) to protect plants from the toxic effects of naphthalene (NPH). Exposing Trifolium repens L. (white clover) to a high concentration of NPH (soil spiked to 500mgkg) for 60 d significantly decreased biomass, CO assimilation rate (Pn), stomatal conductance (Gs) and intercellular CO concentration (Ci), while inducing production of HO and malondialdehyde (MDA). Application of Se (soil spiked to 0.5mgkg) to plants exposed to NPH clearly protected the plants; biomass, Pn, Gs and Ci were significantly higher and contents of MDA and HO decreased. The protection provided to Trifolium repens L. by Se is attributed primarily to an increase in photosynthesis and a decrease in oxidative stress. This study demonstrates that a low concentration of Se protects plants against oxidative stress induced by NPH and can provide a means for improving phytoremediation in PAHs contaminated soils.
多环芳烃（PAHs）是最危险的环境污染物之一，因其具有毒性、致癌性和致突变性。本研究调查了利用硒（Se）保护植物免受萘（NPH）毒性影响的情况。将白三叶草暴露于高浓度的NPH（土壤中添加至500mg/kg）60天，显著降低了生物量、CO2同化率（Pn）、气孔导度（Gs）和细胞间CO2浓度（Ci），同时诱导了过氧化氢（H2O2）和丙二醛（MDA）的产生。向暴露于NPH的植物施用硒（土壤中添加至0.5mg/kg）明显保护了植物；生物量、Pn、Gs和Ci显著更高，MDA和H2O2含量降低。硒对白三叶草的保护作用主要归因于光合作用的增加和氧化应激的降低。本研究表明，低浓度的硒可保护植物免受NPH诱导的氧化应激，并可为改善PAHs污染土壤中的植物修复提供一种方法。
