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首页> 外文期刊>Environmental Science & Technology >Phosphorus Stress-Induced Changes in Plant Root Exudation Could Potentially Facilitate Uranium Mobilization from Stable Mineral Forms
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Phosphorus Stress-Induced Changes in Plant Root Exudation Could Potentially Facilitate Uranium Mobilization from Stable Mineral Forms

机译：磷胁迫诱导的植物根系分泌物变化可能潜在地促进了稳定矿物质形式的铀动员

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Apparent deficiency of soil mineral nutrients often triggers specific physio-morphological changes in plants, and some of these changes could also inadvertently increase the ability of plants to mobilize radionuclides from stable mineral forms. This work, through a series of sand-culture, hydroponics, and batch-equilibration experiments, investigated the differential ability of root exudates of Andropogon virginicus grown under conditions with variable phosphorus (P) availability (KH2PO4, FePO4, Ca-3 (PO4)(2), and no P) to solubilize uranium (U) from the uranyl phosphate mineral Chernikovite. The mineral form of P, and hence the bioavailability of P, affected the overall composition of the root exudates. The lower bioavailable forms of P (FePO4 and Ca-3 (PO4)(2)), but not the complete absence of P, resulted in a higher abundance of root metabolites with chelating capacity at 72 hrs after treatment application. In treatments with lower P-bioavailability, the physiological amino acid concentration inside of the roots increased, whereas the concentration of organic acids in the roots decreased due to the active exudation. In batch dissolution experiments, the organic acids, but not amino acids, increase the dissolution U from Chernikovite. The root exudate matrix of plants exposed to low available forms of P induced a 60% increase in U dissolution from Chernikovite due to 5-16 times greater abundance of organic acids in these treatments. However, this was ca. 70% of the theoretical dissolution achievable by this exudate matrix. These results highlight the potential of using active management of soil P as an effective tool to alter the plant-mediated mobilization of U in contaminated soil.
机译：土壤矿质养分的明显缺乏通常会触发植物的特定生理形态变化，其中一些变化也可能无意中增加了植物从稳定矿物质形态中调集放射性核素的能力。这项工作通过一系列的沙培养，水培和间歇平衡实验，研究了在磷（P）利用率（KH2PO4，FePO4，Ca-3（PO4） （2），并且没有P）从磷酸铀酰矿物Chernikovite中溶解铀（U）。磷的矿物质形式以及磷的生物利用度影响根系分泌物的总体组成。 P的较低生物利用度形式（FePO4和Ca-3（PO4）（2）），但并非完全不存在P，导致根系代谢物的丰度更高，在施药后72小时具有螯合能力。在P生物利用度较低的处理中，根系内部的生理氨基酸浓度增加，而根系中有机酸的浓度由于活跃的渗出而降低。在间歇溶解实验中，有机酸而不是氨基酸增加了切尔尼科维特的溶解度U。暴露于低效磷素形式的植物的根系分泌物基质，由于这些处理中有机酸丰度提高了5-16倍，因此从切尔尼科夫岩中溶出的U量增加了60％以上。但是，这是大约。该渗出物基质可达到理论溶解度的70％。这些结果突出了使用土壤P的主动管理作为改变污染土壤中植物介导的U迁移的有效工具的潜力。

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  • 来源
    《Environmental Science & Technology》 |2018年第14期|7652-7662|共11页
  • 作者

    Edayilam Nimisha; Montgomery Dawn; Ferguson Brennan; Maroli Amith S.; Martinez Nicole; Powell Brian A.; Tharayil Nishanth;

  • 作者单位

    Clemson Univ, Dept Plant & Environm Sci, Clemson, SC 29634 USA;

    Clemson Univ, Dept Environm Engn & Earth Sci, 342 Comp Court, Anderson, SC 29625 USA;

    Clemson Univ, Dept Environm Engn & Earth Sci, 342 Comp Court, Anderson, SC 29625 USA;

    Clemson Univ, Dept Plant & Environm Sci, Clemson, SC 29634 USA;

    Clemson Univ, Dept Environm Engn & Earth Sci, 342 Comp Court, Anderson, SC 29625 USA;

    Clemson Univ, Dept Environm Engn & Earth Sci, 342 Comp Court, Anderson, SC 29625 USA;

    Clemson Univ, Dept Plant & Environm Sci, Clemson, SC 29634 USA;

  • 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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