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首页> 外文期刊>Environmental toxicology and chemistry >CALCIUM AND MAGNESIUM ENHANCE ARSENATE RHIZOTOXICITY AND UPTAKE IN TRIT1CUM AESTIVUM
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CALCIUM AND MAGNESIUM ENHANCE ARSENATE RHIZOTOXICITY AND UPTAKE IN TRIT1CUM AESTIVUM

机译：钙和镁增强砷对人参的根际毒性和摄取

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摘要

Cations such as calcium (Ca) and magnesium (Mg) alleviate toxicities of cationic toxicants and increase those of anionic toxicants such as arsenic (As) present as arsenate under aerobic conditions. Increasing evidence exists that these phenomena are related to the outer surface electrical potential (ψ_0~o) of the root cell plasma membrane (PM). Short-term (48-h) nutrient culture experiments with wheat (Triticum aestivum L.) seedlings investigated Ca and Mg effects on arsenate rhizotoxicity and uptake. Increased Ca and Mg in solution from 0.2 to 3.5 mM equally reduced the negativity of ψ_0~o from -45 to - 15mV. This increased arsenate activity at the PM surface from 0.3 to 0.9 μM at the same bulk concentration of 2.0 μM NaH_2AsO_4 consequently increased arsenate uptake and rhizotoxicity. However, increased Mg was more effective than Ca in enhancing As uptake by roots, especially with the activity of As in the range of 0.5 to 1.5 μM in the bulk medium. This was explained by a modified electrostatic uptake model which indicated a mechanism other than through an effect on ψ_0~o. Subcellular fractionation of roots indicated that > 95% of As was associated with cellular debris and heat-stable protein (HSP). The results of the present study show that Ca and Mg reduce the negativity of ψ_0~o, increasing arsenate uptake and rhizotoxicity, and suggest that Mg is more efficient than Ca in enhancing the uptake of As due, in large part, to inducing greater As binding by peptides in the HSP fraction.
机译：诸如钙（Ca）和镁（Mg）的阳离子可减轻阳离子有毒物质的毒性，并增加好氧条件下以砷酸盐形式存在的诸如砷（As）等阴离子有毒物质的毒性。越来越多的证据表明这些现象与根细胞质膜（PM）的外表面电势（ψ_0〜o）有关。小麦（Triticum aestivum L.）幼苗的短期（48小时）营养培养试验研究了Ca和Mg对砷酸盐根际毒性和吸收的影响。溶液中的Ca和Mg从0.2升高到3.5 mM，将ψ_0〜o的负性从-45降低到-15 mV。在相同体积浓度为2.0μMNaH_2AsO_4的情况下，PM表面的砷酸盐活性从0.3μM增加到0.9μM，因此增加了砷酸盐的吸收和根际毒性。但是，增加镁比增加钙对根的吸收更有效，特别是在散装培养基中，砷的活性在0.5至1.5μM范围内。这可以通过修改后的静电吸收模型来解释，该模型指出了除通过影响ψ_0〜o以外的其他机制。根的亚细胞分级分离表明> 95％的As与细胞碎片和热稳定蛋白（HSP）有关。本研究的结果表明，Ca和Mg降低了ψ_0〜o的负电性，增加了砷的吸收和根际毒性，并且表明Mg在提高As吸收方面比Ca更有效，这在很大程度上是由于诱导了更大的As通过HSP馏分中的肽结合。

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  • 来源
    《Environmental toxicology and chemistry》 |2011年第7期|p.1642-1648|共7页
  • 作者

    Peng Wang; Dongmei Zhou; Nanyan Weng; Dengjun Wang; Willie J.G.M. Peunenburg;

  • 作者单位

    Key Laboratory of Soil Environment & Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China,Graduate School of Chinese Academy of Sciences, Beijing, China;

    Key Laboratory of Soil Environment & Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China;

    Key Laboratory of Soil Environment & Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China,Graduate School of Chinese Academy of Sciences, Beijing, China;

    Key Laboratory of Soil Environment & Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China,Graduate School of Chinese Academy of Sciences, Beijing, China;

    National Institute of Public Health and the Environment, Laboratory for Ecological Risk Assessment, Bilthoven, The Netherlands,Leiden University, Leiden, The Netherlands;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    arsenate; calcium; magnesium; surface electrical potential; root growth;

    机译：砷钙;镁;表面电势根系生长;

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