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首页> 外文期刊>Environmental toxicology and chemistry >Effect of toxic cations on copper rhizotoxicity in wheat seedlings.
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Effect of toxic cations on copper rhizotoxicity in wheat seedlings.

机译：有毒阳离子对小麦幼苗铜根际毒性的影响。

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摘要

Copper pollution may occur in acidic soils where the low pH leads to release of Al and Mn in soil solution, which could interact with Cu toxicity. Very little information exists regarding the influence of toxic cations on the phytotoxicity of Cu. In this study, we tested the hypothesis that phytotoxicity of Cu2+ may be overestimated in acidic soils due to synergism between Al or Mn and Cu toxicity. Rhizotoxicity of Al, Mn, and Cu to wheat seedlings was studied in well-defined nutrient solutions, with these elements present singly or in combination. Toxicity was expressed on a solution metal-activity basis, with metal activities calculated using GEOCHEM-PC and verified using Donnan dialysis. Of the three ions, Cu2+ was the most rhizotoxic, with activities of Cu2+, Al3+, and Mn2+ resulting in a 25% reduction in root elongation of 0.12, 1.26, and 211 microM, respectively. Although there was no interaction between Mn2+ and Cu2+ toxicity, Cu2+ was significantly less toxic on a relative basis in the presenceof Al3+. Thus, critical thresholds for soil solution Cu2+ activity determined in acidic soils will be underprotective compared to soils that contain low concentrations of soluble Al (e.g., limed or nonacidic soils).
机译：铜质污染可能发生在酸性土壤中，低pH值导致土壤溶液中铝和锰的释放，这可能与铜的毒性相互作用。关于毒性阳离子对铜的植物毒性的影响的信息很少。在这项研究中，我们测试了以下假设：由于Al或Mn与Cu毒性之间的协同作用，在酸性土壤中Cu2 +的植物毒性可能被高估了。在明确定义的营养液中研究了铝，锰和铜对小麦幼苗的根际毒性，其中这些元素单独或组合存在。毒性以溶液中的金属活性表示，金属活性使用GEOCHEM-PC计算，并使用Donnan透析进行验证。在这三个离子中，Cu2 +的根际毒性最高，具有Cu2 +，Al3 +和Mn2 +的活性，导致根伸长分别降低25％0.12、1.26和211 microM。尽管Mn2 +和Cu2 +毒性之间没有相互作用，但是在存在Al3 +的情况下，Cu2 +的毒性相对较低。因此，与含有低浓度可溶性Al的土壤（例如，石灰或非酸性土壤）相比，在酸性土壤中确定的土壤溶液Cu2 +活性的临界阈值保护性不足。

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