稀土氧化物纳米颗粒对植物的毒性效应及影响因素研究进展
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摘要
稀土氧化物纳米颗粒(Rare Earth Oxide Nanoparticles,REO NPs)具有纳米毒性和金属毒性的双重效应,其毒性效应、生态环境风险引起国内外学者的广泛关注。随着纳米技术的快速发展,纳米颗粒必然通过各种途径进入环境,给生态环境与人类健康造成危害。因此,研究REO NPs在环境介质中的迁移转化及其对植物的毒性效应机制,对REO NPs合理应用及其生态安全评价具有重要的理论价值和实践指导意义。本文通过查阅文献资料,总结了在水培、土培条件下REO NPs对蔬菜和农作物毒性效应、毒性机理及其影响因素,并在此基础上就REO NPs毒性效应和机理研究进行了展望。REO NPs毒性效应主要表现为:(1)抑制根系生长发育;(2)抑制叶绿素合成进而影响光合效率和生物量。毒性机理主要包括:(1)REO NPs溶出离子直接致毒或与矿质营养离子发生竞争,抑制营养吸收;(2)REO NPs破坏细胞选择透性、产生活性氧自由基、使细胞膜发生脂质过氧化而丧失功能;(3)REO NPs附着于组织表面,阻碍水分、营养物质运输和离子交换。影响REO NPs毒性的因子主要包括REO NPs特性(如溶解性、带电性、粒径大小及形状)、植物本身敏感性或耐受性、环境条件(如酸碱性、带电性等)。REO NPs的毒性效应研究存在选择的污染物类型较少,主要针对幼苗期的植物,少有分子生物学、土培方式、全环境条件研究等问题,后期可从上述方面进行深入研究。
Rare earth oxide nanoparticles(REO NPs) have caught the attention by scientists worldwide as they can potentially harm the environment due to the toxicity associated with the particle size as well as the chemical property. With the advancement of nanotechnology, NPs inevitably enter the environment through various channels causing detrimental effects on the environment and human health. Therefore, studying the translocation and transformation of REO NPs in media and the response mechanism of plants toward the toxicity carries important theoretical and practical significance for the material applications and ecological security. This article summarizes the mechanism and affecting factors associated with the toxicity of REO NPs on the crops cultivated on soil or hydroponics and discusses the prospects of future research and utilization of the NPs. Currently, the toxic effects induced by REO NPs on plants were believed to include(1) the inhibition of root growth and development and(2) the retardation of chlorophyll synthesis reducing the photosynthetic efficiency and biomass accumulation. The toxicity mechanisms focused by various studies were mainly on(1) the functions directly caused by the dissolved REO NPs ions or their competing with other mineral ions on nutrient absorption,(2) the obstruction of selective cellular permeability, the production of oxygen free radicals, and the lipid peroxidation of cell membrane, and(3) the adherence of particles on surface of the plant tissues interfering normal water and nutrients transportation and ion exchange. Major factors that affect the toxicity might encompass the properties of REO NPs(such as, solubility, electrification, particle size, and shape), the sensitivity or tolerance of a plant to REO NPs, and the environmental conditions(such as, acidity, alkalinity, electrification, etc.).The study on toxic effects of REO NPs has fewer types of selected pollutants, mainly for plants in seedling stage, and fewer study on molecular biology, soil culture methods, and all environmental conditions. In the later stage, we can conduct in-depth research from the above aspects.
Rare earth oxide nanoparticles(REO NPs) have caught the attention by scientists worldwide as they can potentially harm the environment due to the toxicity associated with the particle size as well as the chemical property. With the advancement of nanotechnology, NPs inevitably enter the environment through various channels causing detrimental effects on the environment and human health. Therefore, studying the translocation and transformation of REO NPs in media and the response mechanism of plants toward the toxicity carries important theoretical and practical significance for the material applications and ecological security. This article summarizes the mechanism and affecting factors associated with the toxicity of REO NPs on the crops cultivated on soil or hydroponics and discusses the prospects of future research and utilization of the NPs. Currently, the toxic effects induced by REO NPs on plants were believed to include(1) the inhibition of root growth and development and(2) the retardation of chlorophyll synthesis reducing the photosynthetic efficiency and biomass accumulation. The toxicity mechanisms focused by various studies were mainly on(1) the functions directly caused by the dissolved REO NPs ions or their competing with other mineral ions on nutrient absorption,(2) the obstruction of selective cellular permeability, the production of oxygen free radicals, and the lipid peroxidation of cell membrane, and(3) the adherence of particles on surface of the plant tissues interfering normal water and nutrients transportation and ion exchange. Major factors that affect the toxicity might encompass the properties of REO NPs(such as, solubility, electrification, particle size, and shape), the sensitivity or tolerance of a plant to REO NPs, and the environmental conditions(such as, acidity, alkalinity, electrification, etc.).The study on toxic effects of REO NPs has fewer types of selected pollutants, mainly for plants in seedling stage, and fewer study on molecular biology, soil culture methods, and all environmental conditions. In the later stage, we can conduct in-depth research from the above aspects.
引文
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