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首页> 外文期刊>Environmental toxicology and chemistry >INFLUENCE OF ESSENTIAL ELEMENTS ON CADMIUM UPTAKE AND TOXICITY IN A UNICELLULAR GREEN ALGA: THE PROTECTIVE EFFECT OF TRACE ZINC AND COBALT CONCENTRATIONS
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INFLUENCE OF ESSENTIAL ELEMENTS ON CADMIUM UPTAKE AND TOXICITY IN A UNICELLULAR GREEN ALGA: THE PROTECTIVE EFFECT OF TRACE ZINC AND COBALT CONCENTRATIONS

机译：基本元素对单细胞绿藻中镉吸收和毒性的影响：痕量锌和钴浓度的保护作用

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Within the biotic ligand model (BLM) construct, major cations are considered to be simple competitors for metal binding to uptake sites and may offer some protection against metal-induced toxicity, but the influence of essential trace elements and cell preconditioning to different micronutrient concentrations on metal uptake and toxicity is considered negligible. To test these underlying assumptions, we monitored Cd uptake and toxicity in a green alga (Chlamydomonas reinhardtii) after long-term exposures (60 h) to a range of environmentally realistic free Zn~(2+), Co~(2+), Fe~(3+), Mn~(2+), Ca~(2+), and Cu~(2+) concentrations buffered with nitrilotriacetic acid. A 200-fold increase in free [Mn~(2+)] as well as a 100-fold increase in free [Fe~(3+)] did not affect Cd uptake or toxicity, whereas a 50-fold increase in free [Ca~(2+)] effectively offered some protection, as predicted by the BLM. However, a 10-fold increase in free [Cu~(2+)] significantly enhanced Cd toxicity by a factor of approximately 2, whereas a 100-fold increase in free [Zn~(2+)] and [Co~(2+)] from 10~(-11) to 10~(-9) M significantly decreased Cd uptake and toxicity by more than twofold. These effects did not change with prior algal acclimation to different essential micronutrient concentrations. Low essential trace metal concentrations may strongly affect the uptake and toxicity of Cd in freshwater algae and should be taken into consideration in future developments of the BLM.
机译：在生物配体模型（BLM）构建体中，主要阳离子被认为是金属与摄取位点结合的简单竞争者，并可能对金属诱导的毒性提供某些保护，但必需的微量元素和细胞预处理对不同微量营养素浓度的影响金属吸收和毒性被认为可以忽略不计。为了测试这些基本假设，我们在长期暴露于一系列环境上可行的游离Zn〜（2 +），Co〜（2 +），60％汞后，监测了绿藻（Chlamydomonas reinhardtii）中Cd的吸收和毒性。 Fe〜（3 +），Mn〜（2 +），Ca〜（2+）和Cu〜（2+）浓度用次氮基三乙酸缓冲。游离[Mn〜（2+）]增加200倍，游离[Fe〜（3+）]增加100倍不影响Cd的吸收或毒性，而游离[Mn]增加50倍。如BLM所预测，Ca〜（2+）]有效地提供了一些保护。但是，游离[Cu〜（2+）]的10倍增加显着提高了Cd毒性约2倍，而游离[Zn〜（2+）]和[Co〜（2）则增加了100倍+）]从10〜（-11）到10〜（-9）M可使Cd吸收和毒性显着降低两倍以上。在事先适应不同的必需微量营养素浓度的藻类后，这些影响没有改变。必需的痕量金属浓度低可能会严重影响淡水藻类中Cd的吸收和毒性，因此在BLM的未来开发中应予以考虑。

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