Syranidou Evdokia, Christofilopoulos Stavros, Gkavrou Georgia, Thijs Sofie, Weyens Nele, Vangronsveld Jaco, Kalogerakis Nicolas
School of Environmental Engineering, Technical University of CreteChania, Greece; Centre for Environmental Sciences, Hasselt UniversityDiepenbeek, Belgium.
School of Environmental Engineering, Technical University of Crete Chania, Greece.
Front Microbiol. 2016 Jul 4;7:1016. doi: 10.3389/fmicb.2016.01016. eCollection 2016.
This study investigated the potential of indigenous endophytic bacteria to improve the efficiency of the wetland helophyte Juncus acutus to deal with a mixed pollution consisting of emerging organic contaminants (EOCs) and metals. The beneficial effect of bioaugmentation with selected endophytic bacteria was more prominent in case of high contamination: most of the inoculated plants (especially those inoculated with the mixed culture) removed higher percentages of organics and metals from the liquid phase in shorter times compared to the non-inoculated plants without exhibiting significant oxidative stress. When exposed to the lower concentrations, the tailored mixed culture enhanced the performance of the plants to decrease the organics and metals from the water. The composition of the root endophytic community changed in response to increased levels of contaminants while the inoculated bacteria did not modify the community structure. Our results indicate that the synergistic relationships between endophytes and the macrophyte enhance plants' performance and may be exploited in constructed wetlands treating water with mixed contaminations. Taking into account that the concentrations of EOCs used in this study are much higher than the average contents of typical wastewaters, we can conclude that the macrophyte J. acutus with the aid of a mixed culture of tailored endophytic bacteria represents a suitable environmentally friendly alternative for treating pharmaceuticals and metals.
本研究调查了本地内生细菌提高湿地沼生植物锐尖灯心草应对由新兴有机污染物（EOCs）和金属组成的混合污染效率的潜力。在高污染情况下，用选定内生细菌进行生物强化的有益效果更为显著：与未接种的植物相比，大多数接种植物（尤其是接种混合培养物的植物）在更短时间内从液相中去除了更高百分比的有机物和金属，且未表现出明显的氧化应激。当暴露于较低浓度时，定制的混合培养物提高了植物降低水中有机物和金属的性能。随着污染物水平的增加，根内生群落的组成发生了变化，而接种的细菌并未改变群落结构。我们的结果表明，内生菌与大型植物之间的协同关系增强了植物的性能，可用于处理混合污染水体的人工湿地。考虑到本研究中使用的EOCs浓度远高于典型废水的平均含量，我们可以得出结论，借助定制内生细菌混合培养的大型植物锐尖灯心草是处理药物和金属的合适环保替代品。
