Department of Biology, Queen's University, Kingston, Ontario, Canada.
Int J Phytoremediation. 2011 Aug;13(7):702-16. doi: 10.1080/15226514.2010.525553.
Phytoremediation at contaminated sites is often complicated by the presence of more than one chemical However, the effects of common co-contaminants such as ethylene glycol on the phytoremediation of other chemicals, e.g., 1,4-dioxane, is not well understood. Field studies with DN34 poplar trees revealed a 28% decline in growth rate in response to 10 g/L ethylene glycol in the groundwater, thus indicating a significant and deleterious effect on tree viability, and likely, the plants' utility for phytoremediation. Thorough investigations using Arabidopsis thaliana, with its small size and rapid life cycle, indicated significant growth reduction at 10 g/L and complete inhibition of germination at 40 g/L ethylene glycol Ethylene glycol was almost as severe a stressor as the well characterized osmotic inhibitor, sorbitoL Watering potted trees with 10 g/L ethylene glycol reduced their growth by more than 50%, and similar results were observed in hydroponically grown poplar and willow trees. Under hydroponic conditions, 60 g/L ethylene glycol inhibited the phytovolatilization of l,4-dioxane by more than 80%, and all trees evapo-transpired 1,4-dioxane less efficiently than water. In fact, this efficiency differed between trees and the difference became more pronounced in the presence of ethylene glycol.
在受污染的地点进行植物修复常常会因存在多种化学物质而变得复杂。然而，对于常见的共污染物（如乙二醇）对其他化学物质（如 1,4-二恶烷）的植物修复的影响，人们了解得并不充分。通过对 DN34 杨树进行的田间研究表明，地下水中存在 10 克/升乙二醇会导致生长速度下降 28%，这表明对树木的生存能力有显著的有害影响，而且可能对植物修复的利用也有影响。使用拟南芥进行的深入研究表明，在 10 克/升时生长明显减少，在 40 克/升时完全抑制发芽，表明其具有严重的生长抑制作用。乙二醇的胁迫作用几乎与特征明确的渗透抑制剂山梨糖醇一样严重。用 10 克/升乙二醇浇灌盆栽树木，会使其生长减少 50%以上，在水培条件下生长的杨树和柳树也观察到了类似的结果。在水培条件下，60 克/升乙二醇会抑制 1,4-二恶烷的植物挥发，超过 80%，而且所有树木的 1,4-二恶烷蒸腾效率都低于水。事实上，这种效率因树木而异，而且在存在乙二醇的情况下，差异更加明显。
