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首页> 外文期刊>Environmental Science & Technology >Zinc Isotope Fractionation in the Hyperaccumulator Noccaea caerulescens and the Nonaccumulating Plant Thlaspi arvense at Low and High Zn Supply
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Zinc Isotope Fractionation in the Hyperaccumulator Noccaea caerulescens and the Nonaccumulating Plant Thlaspi arvense at Low and High Zn Supply

机译：高和低供锌条件下超级蓄积夜蛾和非蓄积拟南芥中的锌同位素分馏

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摘要

On the basis of our previous field survey, we postulate that the pattern and degree of zinc (Zn) isotope fractionation in the Zn hyperaccumulator Noccaea caerulescens (J. & C. Presl) F. K. Mey may reflect a relationship between Zn bioavailability and plant uptake strategies. Here, we investigated Zn isotope discrimination during Zn uptake and translocation in N. caerulescens and in a nonaccumulator Thlaspi arvense L. with a contrasting Zn accumulation ability in response to low (Zn-L) and high (Zn-H) Zn supplies. The average isotope fractionations of the N. caerulescens plant as a whole, relative to solution (Δ~(66)Zn_(plant-solution), were -0.06 and -0.12‰ at Zn-L-C and Zn-H-C, respectively, indicative of the predominance of a high-affinity (e.g., ZIP transporter proteins) transport across the root cell membrane. For T. arvense, plants were more enriched in light isotopes under Zn-H-A (Δ~(66)Zn_(plant-solution) = -0.26‰) than under Zn-L-A and N. caerulescens plants, implying that a low-affinity (e.g., ion channel) transport might begin to function in the nonaccumulating plants when external Zn supply increases. Within the root tissues of both species, the apoplast fractions retained up to 30% of Zn mass under Zn-H. Moreover, the highest δ~(66)Zn (0.75‰-0.86‰) was found in tightly bound apoplastic Zn, pointing to the strong sequestration in roots (e.g., binding to high-affinity ligands/ precipitation with phosphate) when plants suffer from high Zn stress. During translocation, the magnitude of isotope fractionation was significantly greater at Zn-H (Δ~(66)Zn_(root-shoot) = 0.79‰) than at Zn-L, indicating that fractionation mechanisms associated with root-shoot translocation might be identical to the two plant species. Hence, we clearly demonstrated that Zn isotope fractionation could provide insight into the internal sequestration mechanisms of roots when plants respond to low and high Zn supplies.
机译：根据我们先前的现场调查，我们假设锌超富集夜蛾Noccaea caerulescens（J.＆C. Presl）FK Mey中锌（Zn）同位素分馏的模式和程度可能反映了锌生物利用度与植物吸收策略之间的关系。 。在这里，我们研究了青菜猪笼草和非蓄积拟南芥中锌的吸收和转运过程中的锌同位素歧视，其中低（Zn-L）和高（Zn-H）锌供应对锌的累积能力形成了鲜明的对比。相对于溶液（Δ〜（66）Zn_（植物溶液），Zn-LC和Zn-HC而言，整个芥蓝植物的平均同位素分馏分别为-0.06和-0.12‰。高亲和力（例如，ZIP转运蛋白）在根细胞膜上的转运。对于T. arvense，在Zn-HA（Δ〜（66）Zn_（plant-solution）= -0.26‰）比Zn-LA和芥蓝植物下的浓度高，这意味着当外部锌供应增加时，低亲和力（例如离子通道）运输可能在非积累型植物中开始起作用。在两个物种的根组织中，在Zn-H下，质外体组分最多保留Zn质量的30％。此外，在紧密结合的质外性Zn中发现最高的δ〜（66）Zn（0.75‰-0.86‰），这表明根部的固存力强（例如： ，当植物遭受高锌胁迫时，与高亲和力配体结合/磷酸盐沉淀）。 Zn-H（Δ〜（66）Zn_（root-shoot）= 0.79‰）处的同位素分馏显着大于Zn-L处的同位素分馏，表明与根茎易位相关的分馏机制可能与这两种植物相同。因此，我们清楚地表明，当植物对低锌和高锌供应作出反应时，锌同位素分馏可以提供对根内部固存机制的了解。

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  • 来源
    《Environmental Science & Technology》 |2016年第15期|8020-8027|共8页
  • 作者

    Ye-Tao Tang; Christophe Cloquet; Teng-Hao-Bo Deng; Thibault Sterckeman; Guillaume Echevarria; Wen-Jun Yang; Jean-Louis Morel; Rong-Liang Qiu;

  • 作者单位

    School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, P.R. China,Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University,Guangzhou 510275, P.R. China;

    CRPG-CNRS, Universite de Lorraine (UMR 7358N), 15 rue Notre-Dame-des-Pauvres BP 20, 54501 Vandoeuvre les Nancy, France;

    School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, P.R. China;

    Laboratoire Sols et Environnement, INRA-Universite de Lorraine, 2 avenue de la Foret de Haye, TSA 40602, F-54518 Vandoeuvre-les-Nancy Cedex, France;

    Laboratoire Sols et Environnement, INRA-Universite de Lorraine, 2 avenue de la Foret de Haye, TSA 40602, F-54518 Vandoeuvre-les-Nancy Cedex, France;

    School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, P.R. China;

    Laboratoire Sols et Environnement, INRA-Universite de Lorraine, 2 avenue de la Foret de Haye, TSA 40602, F-54518 Vandoeuvre-les-Nancy Cedex, France;

    School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, P.R. China,Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University,Guangzhou 510275, P.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);
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