College of Environment and Resource, Center of Environmental Science and Engineering, Shanxi University, Taiyuan, Shanxi 030006, PR China.
Waste Manag. 2010 May;30(5):856-62. doi: 10.1016/j.wasman.2010.01.023. Epub 2010 Feb 11.
With an increasing focus on phyto-remediation options for landfill leachate, it is important to understand the responses of plant systems to landfill leachate stress. It is especially important to study the tolerant mechanisms of plant systems. We investigated several physiological changes of Zea mays L. (maize) in response to landfill leachate. Specifically, we investigated growth, chlorophyll content, lipid peroxidation, protein oxidation and activities of antioxidant enzymes. The results indicate that landfill leachate affected the growth and chlorophyll level of maize seedlings. Furthermore, landfill leachate elevated the levels of lipid peroxidation and protein oxidation in leaf tissues in a time-dependent manner, accompanied by the changes in antioxidant status. The physiological responses varied as a function of leachate concentration, and the growth inhibition, chlorophyll content inhibition and oxidative stress occurred after the exposure of higher concentrations of leachate. Higher concentrations of landfill leachate contained higher levels of pollutants. Our results indicate that landfill leachate affected the metabolic responses of plant systems. The risk of pollution occurred mainly in samples of higher concentration. Therefore, the critical aspect of phyto-remediation for landfill leachate is controlling its concentration. In doing so, plant systems may be able to tolerate the environmental stress of landfill leachate.
随着人们越来越关注植物修复方法来处理垃圾渗滤液，了解植物系统对垃圾渗滤液胁迫的响应就显得尤为重要。研究植物系统的耐受机制尤为重要。本研究调查了玉米（Zea mays L.）对垃圾渗滤液的几种生理变化。具体来说，我们研究了生长、叶绿素含量、脂质过氧化、蛋白质氧化和抗氧化酶活性。结果表明，垃圾渗滤液影响了玉米幼苗的生长和叶绿素水平。此外，垃圾渗滤液会随时间的推移，以时间依赖的方式增加叶片组织中的脂质过氧化和蛋白质氧化水平，同时改变抗氧化状态。生理反应随渗滤液浓度的变化而变化，在暴露于较高浓度的渗滤液后，出现了生长抑制、叶绿素含量抑制和氧化应激。较高浓度的垃圾渗滤液含有更高水平的污染物。我们的结果表明，垃圾渗滤液影响了植物系统的代谢反应。污染风险主要发生在浓度较高的样本中。因此，垃圾渗滤液植物修复的关键方面是控制其浓度。这样，植物系统可能能够耐受垃圾渗滤液的环境胁迫。
