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首页> 外文期刊>Environmental Science & Technology >Spatially Resolved Localization of Lanthanum and Cerium in the Rare Earth Element Hyperaccumulator Fern Dicranopteris linearis from China
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Spatially Resolved Localization of Lanthanum and Cerium in the Rare Earth Element Hyperaccumulator Fern Dicranopteris linearis from China

机译：中国稀土元素超富集蕨类Dicranopteris linearis的镧和铈的空间分辨定位

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摘要

The fern Dicranopteris linearis (Gleicheniaceae) from China is a hyperaccumulator of rare earth element (REE), but little is known about the ecophysiology of REE in this species. This study aimed to clarify tissue-level and organ-level distribution of REEs via synchrotron-based X-ray fluorescence microscopy (XFM). The results show that REEs (La + Ce) are mainly colocalized with Mn in the pinnae and pinnules, with the highest concentrations in necrotic lesions and lower concentrations in veins. In the cross sections of the pinnules, midveins, rachis, and stolons, La + Ce and Mn are enriched in the epidermis, vascular bundles, and pericycle (midvein). In these tissues, Mn is localized mainly in the cortex and mesophyll. We hypothesize that the movement of REEs in the transpiration flow in the veins is initially restricted in the veins by the pericycle between vascular bundle and cortex, while excess REEs are transported by evaporation and cocompartmentalized with Mn in the necrotic lesions and epidermis in an immobile form, possibly a Si-coprecipitate. The results presented here provide insights on how D. linearis regulates high concentrations of REEs in vivo, and this knowledge is useful for developing phytotechnological applications (such as REE agromining) using this fern in REE-contaminated sites in China.
机译：来自中国的蕨类植物Dicranopteris linearis（Gleicheniaceae）是稀土元素（REE）的过度积累者，但对该物种的REE生理生态知之甚少。这项研究旨在通过基于同步加速器的X射线荧光显微镜（XFM）阐明REE的组织水平和器官水平分布。结果表明，稀土元素（La + Ce）主要在叶突和叶突中与Mn共存，坏死病变中的浓度最高，而静脉中的浓度较低。在针状，中脉，轴突和茎的横截面中，La + Ce和Mn富含表皮，维管束和周生环（中脉）。在这些组织中，Mn主要位于皮层和叶肉中。我们假设，REEs在静脉中的蒸腾流的运动最初受血管束和皮层之间的周缘循环限制，而多余的REEs通过蒸发运输，并与坏死性病变和表皮中的Mn共同分隔成不可移动的形式，可能是Si共沉淀物。此处提供的结果提供了关于线虫如何在体内调节高浓度REEs的见识，并且该知识对于在中国被REE污染的地区使用这种蕨类植物开发植物技术应用（例如REE农业）非常有用。

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  • 来源
    《Environmental Science & Technology》 |2020年第4期|2287-2294|共8页
  • 作者

    Wen-Shen Liu; Antony van der Ent; Peter D. Erskine; Jean Louis Morel; Guillaume Echevarria; Kathryn M. Spiers; Emmanuelle Montargès-Pelletier; Rong-Liang Qiu; Ye-Tao Tang;

  • 作者单位

    School of Environmental Science and Engineering Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology and Guangdong Provincial Engineering Research Center for Heavy Metal Contaminated Soil Remediation Sun Yat-sen University Guangzhou 510275 China;

    Centre for Mined Land Rehabilitation Sustainable Minerals Institute The University of Queensland St Lucia Queensland 4072 Australia Université de Lorraine INRA Laboratoire Sols et Environnement Nancy 54000 Prance;

    Centre for Mined Land Rehabilitation Sustainable Minerals Institute The University of Queensland St Lucia Queensland 4072 Australia;

    Université de Lorraine INRA Laboratoire Sols et Environnement Nancy 54000 France;

    Centre for Mined Land Rehabilitation Sustainable Minerals Institute The University of Queensland St Lucia Queensland 4072 Australia Université de Lorraine INRA Laboratoire Sols et Environnement Nancy 54000 France;

    Photon Science Deutsches Elektronen-Synchrotron DESY Hamburg 22607 Germany;

    CNRS-Université de Lorraine Laboratoire Interdisciplinaire des Environnements Continentaux Vandoeuvre-lês-Nancy F-54500 France;

    School of Environmental Science and Engineering Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology and Guangdong Provincial Engineering Research Center for Heavy Metal Contaminated Soil Remediation Sun Yat-sen University Guangzhou 510275 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);
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