Al-Mansoory Asia Fadhile, Idris Mushrifah, Abdullah Siti Rozaimah Sheikh, Anuar Nurina
School of Environmental and Natural Resource Sciences, Universiti Kebangsaan Malaysia, 43600, UKM Bangi, Selangor, Malaysia.
Department of Biology, Science College, Basrah University, Basrah, Iraq.
Environ Sci Pollut Res Int. 2017 May;24(13):11998-12008. doi: 10.1007/s11356-015-5261-5. Epub 2015 Sep 2.
Greenhouse experiments were carried out to determine the phytotoxic effects on the plant Ludwigia octovalvis in order to assess its applicability for phytoremediation gasoline-contaminated soils. Using plants to degrade hydrocarbons is a challenging task. In this study, different spiked concentrations of hydrocarbons in soil (1, 2, and 3 g/kg) were tested. The results showed that the mean efficiency of total petroleum hydrocarbon (TPH) removal over a 72-day culture period was rather high. The maximum removal of 79.8 % occurred for the 2 g/kg concentration, while the removal rate by the corresponding unplanted controls was only (48.6 %). The impact of gasoline on plants included visual symptoms of stress, yellowing, growth reduction, and perturbations in the developmental parameters. The dry weight and wet weight of the plant slightly increased upon exposure to gasoline until day 42. Scanning electron microscopy (SEM) indicated change to the root and stem structure in plant tissue due to the direct attachment with gasoline contaminated compared to the control sample. The population of living microorganisms in the contaminated soil was found to be able to adapt to different gasoline concentrations. The results showed that L. octovalvis and rhizobacteria in gasoline-contaminated soil have the potential to degrade organic pollutants.
进行了温室试验，以确定对水龙的植物毒性效应，从而评估其在植物修复汽油污染土壤中的适用性。利用植物降解碳氢化合物是一项具有挑战性的任务。在本研究中，测试了土壤中不同加标浓度的碳氢化合物（1、2和3克/千克）。结果表明，在72天的培养期内，总石油烃（TPH）的平均去除效率相当高。2克/千克浓度下的最大去除率为79.8%，而相应未种植对照的去除率仅为48.6%。汽油对植物的影响包括胁迫的视觉症状、变黄、生长减少以及发育参数的扰动。在暴露于汽油的情况下，直到第42天植物的干重和湿重略有增加。扫描电子显微镜（SEM）表明，与对照样品相比，由于与汽油污染直接接触，植物组织的根和茎结构发生了变化。发现污染土壤中活微生物的数量能够适应不同的汽油浓度。结果表明，水龙和汽油污染土壤中的根际细菌具有降解有机污染物的潜力。
