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首页> 外文期刊>Journal of Hazardous Materials >The roles of silicon in combating cadmium challenge in the Marine diatom Phaeodactylum tricornutum
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The roles of silicon in combating cadmium challenge in the Marine diatom Phaeodactylum tricornutum

机译：硅在对抗海洋硅藻Phaeodactylum tricornutum中的镉挑战中的作用

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摘要

Marine phytoplankton possess a sophisticated homeostatic network to counteract metal toxicity. Changes in environmental conditions such as ambient nutrient concentrations can significantly impact their intrinsic metal sensitivity. In this study, we evaluated the role of silicon (Si) in counteracting cadmium (Cd) toxicity in the marine diatom Phaeodactylum tricornutum. We first demonstrated that Si enrichment dramatically enhanced Cd tolerance and changed the Cd accumulation in the diatom. Our modeling suggested that Si-enriched cells adsorbed more Cd but had a higher Cd elimination rate than the Si-starved cells. Examinations by atomic force microscopy and X-ray photoelectron spectroscopy revealed that the Si-enriched cells had better silification and more SiO- in the cell walls, which markedly lowered the surface potential of the diatom cells and allowed them to attract more Cd. Although the Si-enriched cells tended to have a high Cd burden when facing Cd stress, they suppressed the increase of intracellular Cd by both down-regulating the influx transporter ZIP and up-regulating the efflux transporter ATPase5-1B. Our study shows the significant roles Si plays in maintaining metal homeostasis and combating Cd challenge in marine diatoms.
机译：海洋浮游植物拥有完善的体内平衡网络以抵消金属毒性。环境条件的变化（例如环境营养物浓度）会显着影响其固有的金属敏感性。在这项研究中，我们评估了硅（Si）在抵消海洋硅藻Phaeodactylum tricornutum中镉（Cd）毒性中的作用。我们首先证明了Si富集显着提高了Cd耐受性并改变了硅藻中Cd的积累。我们的模型表明，富硅细胞比缺硅细胞吸收更多的镉，但镉去除率更高。通过原子力显微镜和X射线光电子能谱检查发现，富硅细胞具有更好的硅化作用，并且细胞壁中的SiO-含量更高，这显着降低了硅藻细胞的表面电势并使它们吸收更多的Cd。尽管富含Si的细胞在面对Cd胁迫时趋向于具有高的Cd负担，但是它们通过下调流入转运蛋白ZIP和上调流出转运蛋白ATPase5-1B两者抑制细胞内Cd的增加。我们的研究表明，硅在维持金属稳态和对抗海洋硅藻中的Cd挑战中起着重要作用。

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  • 来源
    《Journal of Hazardous Materials》 |2020年第may5期|121903.1-121903.10|共10页
  • 作者

  • 作者单位

    Shenzhen Univ Inst Adv Study Shenzhen 518060 Peoples R China|Shenzhen Univ Coll Optoelect Engn Key Lab Optoelect Devices & Syst Minist Educ & Guangdong Prov Shenzhen 518060 Peoples R China;

    Xiamen Univ Coll Environm & Ecol Key Lab Coastal & Wetland Ecosyst Minist Educ Xiamen 361102 Fujian Peoples R China|Xiamen Univ Ctr Marine Environm Chem & Toxicol Xiamen 361102 Fujian Peoples R China;

    Chinese Acad Sci South China Sea Inst Oceanol Key Lab Trop Marine Bioresources & Ecol Guangzhou 510301 Peoples R China|Chinese Acad Sci Innovat Acad South China Sea Ecol & Environm Engn Guangzhou 510301 Peoples R China;

    Shenzhen Univ Inst Adv Study Shenzhen 518060 Peoples R China;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Metal toxicity; Marine diatom; Silicon; Cadmium; Cell wall;

    机译：金属毒性;海洋硅藻;硅;镉;细胞壁;

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