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首页> 外文期刊>Environmental Science & Technology >Root Uptake and Phytotoxicity of ZnO Nanoparticles
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Root Uptake and Phytotoxicity of ZnO Nanoparticles

机译：ZnO纳米粒子的根吸收和植物毒性

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Increasing application of nanotechnology highlights the need to clarify nanotoxicity. However, few researches have focused on phytotoxicity of nanomaterials; it is unknown whether plants can uptake and transport nanoparticles. This study was to examine cell internalization and upward translocation of ZnO nanoparticles by Lolium perenne (ryegrass). The dissolution of ZnO nanoparticles and its contribution to the toxicity on ryegrass were also investigated. Zn~(2+) ions were used to compare and verify the rootuptake and phytotoxicity of ZnO nanoparticles in a hydroponic culture system. The root uptake and phytotoxicity were visualized by light scanning electron, and transmission electron microscopies. In the presence of ZnO nanoparticles, ryegrass biomass significantly reduced, root tips shrank, and root epidermal and cortical cells highly vacuolated or collapsed. Zn~(2+) ion concentrations in bulk nutrient solutions with ZnO nanoparticles were lower than the toxicity threshold of Zn~(2+) to the ryegrass; shoot Zn contents under ZnO nanoparticle treatments were much lower than that under Zn~(2+) treatments. Therefore, the phytotoxicity of ZnO nanoparticles was not directly from their limited dissolution in the bulk nutrient solution or rhizosphere. ZnO nanoparticles greatly adhered onto the root surface. Individual ZnO nanoparticles were observed present in apoplast and protoplast of the root endodermis and stele. However, translocation factors of Zn from root to shoot remained very low under ZnO nanoparticle treatments, and were much lowerthan that under Zn~(2+) treatments, implying that little (if any) ZnO nanoparticles could translocate up in the ryegrass in this study.
机译：纳米技术的日益应用凸显了澄清纳米毒性的必要性。但是，很少有研究关注纳米材料的植物毒性。尚不清楚植物是否可以摄取和运输纳米颗粒。这项研究旨在检查黑麦草（黑麦草）对ZnO纳米颗粒的细胞内在化和向上移位。还研究了ZnO纳米颗粒的溶解及其对黑麦草毒性的影响。 Zn〜（2+）离子用于比较和验证水培培养系统中ZnO纳米粒子的根吸收和植物毒性。通过光扫描电子和透射电子显微镜观察根吸收和植物毒性。在存在ZnO纳米颗粒的情况下，黑麦草的生物量显着减少，根尖收缩，并且根表皮和皮质细胞高度空泡化或塌陷。含有ZnO纳米颗粒的大量营养液中的Zn〜（2+）离子浓度低于Zn〜（2+）对黑麦草的毒性阈值。 ZnO纳米粒子处理的茎秆锌含量远低于Zn〜（2+）处理。因此，ZnO纳米颗粒的植物毒性并非直接来自其在整体营养液或根际中的有限溶解。 ZnO纳米颗粒极大地粘附在根表面。在根部内胚层和石碑的质外体和原生质体中观察到单独的ZnO纳米颗粒。然而，在ZnO纳米颗粒处理下，锌从根到芽的转运因子仍然很低，并且远低于在Zn〜（2+）处理下，这表明该研究中几乎没有（如果有的话）ZnO纳米颗粒可以在黑麦草中向上转运。 。

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  • 来源
    《Environmental Science & Technology》 |2008年第15期|5580-5585|共6页
  • 作者

    DAOHUI LIN; BAOSHAN XING;

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  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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