...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental and experimental botany >Citrate assisted phytoextraction of uranium by sunflowers: Study of fluxes in soils and plants and resulting intra-planta distribution of Fe and U
【24h】

Citrate assisted phytoextraction of uranium by sunflowers: Study of fluxes in soils and plants and resulting intra-planta distribution of Fe and U

机译：向日葵辅助柠檬酸盐对铀的植物提取：研究土壤和植物中的通量及其在植物体内铁和铀的分布

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This study aimed to determine how the citric acid assisted phytoextraction of uranium (U) by sunflowers impacted on the remobilisation of U in soil, its subsequent transfer to plants and its further distribution intra-planta. Consequences of the flux of nutrient elements [iron (Fe) and zinc (Zn)] able to interfere with U during this process were also specifically addressed. A U-contaminated soil receiving different citric acid treatments in terms of dose delivered and frequency of delivery was studied. Dynamics of remobilisation in soil were assessed using DGT (Diffusive Gradient in Thin-film) measurements, and phytoextraction experiments were conducted in a Rhizoplan device. All treatments induced a remobilisation of U and Fe from the soil solid-phase to the soil solution. Consequently, sunflower uptake of U was greatly enhanced, whereas the uptake of Fe was not affected - in accordance with the high regulation of this nutrient in the plant. As for U, the Zn uptake increased due to the citric acid treatment. The DGT-measured concentration correlated well with the concentration taken up by plants for U. Nevertheless, under all conditions, U fluxes to DGT were higher than U fluxes to plants, suggesting that DGT did not mimic the plant uptake mechanism for U. There was no correlation found for Fe, due to its plant uptake regulation. Distribution of these elements in planta was strongly impacted by citric acid, with an increase in translocation from root-to-shoot of both U and Fe, whereas Zn remained mainly in the roots. Such an increase was expected for U but was very surprising for Fe, suggesting that the presence of U in plants may have interfered with mechanisms that regulate Fe homeostasis. (C) 2011 Elsevier B.V. All rights reserved.
机译：这项研究的目的是确定向日葵对柠檬酸的辅助植物铀的提取对铀在土壤中的迁移，随后向植物的转移以及在植物体内的进一步分布的影响。还专门讨论了在此过程中会干扰U的营养元素[铁（Fe）和锌（Zn）]的通量的后果。研究了U污染的土壤，该土壤接受了不同的柠檬酸处理，其剂量和剂量均不同。使用DGT（薄膜中的扩散梯度）测量评估土壤中的迁移动态，并在Rhizoplan设备中进行植物提取实验。所有处理均导致U和Fe从土壤固相迁移到土壤溶液。因此，根据植物中这种养分的高度调节，向日葵的U吸收量大大提高，而Fe的吸收没有受到影响。至于U，由于柠檬酸处理，锌的吸收增加。 DGT测得的浓度与植物吸收U的浓度有很好的相关性。然而，在所有条件下，DGT的U通量都比植物的U通量高，这表明DGT不能模拟植物吸收U的机理。由于铁的植物吸收调节，未发现铁的相关性。这些元素在植物中的分布受到柠檬酸的强烈影响，U和Fe的从根到茎的易位增加，而Zn主要保留在根中。铀的增加预期如此，但铁的含量却令人惊讶，这表明植物中铀的存在可能干扰了调节铁稳态的机制。 （C）2011 Elsevier B.V.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号