Ministry of Education Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, College of Environmental Science and Engineering, Hohai University, Nanjing, P. R. China.
Water Environ Res. 2010 Feb;82(2):147-54. doi: 10.2175/106143009x442970.
An indoor experiment was undertaken to investigate the response of phytochelatins and their relationship to cadmium toxicity in Pistia stratiotes L., a free-floating macrophyte, exposed to low concentrations of cadmium typically found in realistic environments. Cadmium concentrations of 0.01 to 0.08 microM had no toxic effects on the growth of this plant, as indicated by no significant changes in the fresh weights of leaves and roots and the slight induction of phytochelatins in plant tissues, whereas cadmium concentrations of 0.16 to 1 microM were toxic, and cadmium toxicity increased with the increase of cadmium concentrations in solutions, accompanied by the dramatic production of phytochelatins in plant tissues, especially in roots. There was a positive correction between root phytochelatin levels and cadmium toxicity, as measured by the growth inhibition rate of the root fresh weight. The results suggested that phytochelatins in aquatic macrophytes can serve as sensitive biomarkers for heavy metal toxicity in a moderately polluted water environment.
开展了一项室内实验，以研究在浮萍（Pistia stratiotes L.）中植物螯合肽的反应及其与镉毒性的关系，浮萍是一种自由漂浮的大型水生植物，暴露于现实环境中常见的低浓度镉下。0.01 至 0.08 μM 的镉浓度对这种植物的生长没有毒性作用，这表现为叶片和根的鲜重没有明显变化，并且植物组织中植物螯合肽的轻微诱导，而 0.16 至 1 μM 的镉浓度则具有毒性，并且随着溶液中镉浓度的增加，镉毒性增加，同时植物组织中植物螯合肽的大量产生，特别是在根中。根中植物螯合肽水平与镉毒性之间存在正相关关系，这可以通过根鲜重生长抑制率来衡量。结果表明，水生大型植物中的植物螯合肽可以作为中度污染水环境中重金属毒性的敏感生物标志物。
