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首页> 外文期刊>Journal of Asian earth sciences >Zinc, iron, and copper isotopic fractionation in Elsholtzia splendens Nakai: A study of elemental uptake and (re)translocation mechanisms
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Zinc, iron, and copper isotopic fractionation in Elsholtzia splendens Nakai: A study of elemental uptake and (re)translocation mechanisms

机译：s中Na中锌，铁和铜的同位素分馏：元素吸收和（再）易位机理的研究

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摘要

Zinc, Fe and previously reported Cu isotopic compositions were applied in a systematic investigation of uptake and translocation in Cu-tolerant Elsholtzia splendens Nakai. They exhibit characteristic isotopic fractionation during uptake: non-specific uptake for Zn, direct uptake as Fe(W)-complexes as strategy II species and a prerequisite of Cu(II) reduction to Cu(I) before uptake of Cu. There are, however, differences during translocation from stem and branch to leaf and flower. Light Zn and Fe isotopic compositions of flowers are dependent on their phloem pool, with enrichment in branch and stem. The similarity of Zn and Fe isotopic compositions in flowers, regardless of height, implies uniform mobility in phloem. Cu isotopic composition displays marked variations in leaves and flowers with height. Re-translocation from old tissue to new tissue has a significant influence on metal isotopic compositions in leaves and flowers during the late life stage. Light Zn and Fe isotopes are exported from leaves by transporters, leaving heavy isotopes in the remaining fraction. Cu readily forms complexes, and its heavy isotope is re-translocated preferentially and then light isotope by transporter proteins from old leaves dependent on the degree of remobilization. The remobilization efficiency follows the trend Zn < Fe < Cu, opposite to the trend of metal mobility in xylem and phloem (Zn > Fe > Cu).
机译：锌，铁和先前报道的铜同位素组成被用于系统地研究耐铜耐寒El（Elsholtzia splendens Nakai）的吸收和转运。它们在摄取过程中表现出特征性的同位素分级分离：对Zn的非特异性摄取，作为策略II物种的直接作为Fe（W）络合物的摄取以及在摄取Cu之前将Cu（II）还原为Cu（I）的先决条件。但是，在从茎和枝到叶和花的移位过程中存在差异。花的轻锌和铁同位素组成取决于韧皮部池，并富集在枝和茎中。花朵中Zn和Fe同位素组成的相似性，无论高度如何，都意味着韧皮部具有均匀的迁移率。铜同位素组成显示叶和花随高度的显着变化。在生命后期，从旧组织重新移位到新组织对叶片和花朵中的金属同位素组成具有重大影响。轻的锌和铁同位素通过转运蛋白从叶片中输出，其余部分则剩下重的同位素。铜很容易形成络合物，其重同位素优先迁移，然后由老叶片的转运蛋白吸收轻同位素，这取决于迁移的程度。迁移效率遵循Zn Fe> Cu）。

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  • 来源
    《Journal of Asian earth sciences》 |2020年第may1期|104227.1-104227.12|共12页
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    Chinese Acad Geol Sci Inst Geol MNR Key Lab Isotope Geol MNR Key Lab Deep Earth Dynam Beijing 100037 Peoples R China;

    Chinese Acad Sci Inst Soil Sci Key Lab Soil Environm & Pollut Remediat Nanjing 210008 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Zn isotopes; Fe isotopes; Cu isotopes; Uptake; Translocation; Remobilization;

    机译：锌同位素;铁同位素;铜同位素;吸收;易位;复员;

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