Assessing the potential for rhizoremediation of PCB contaminated soils in northern regions using native tree species.
Assessing the potential for rhizoremediation of PCB contaminated soils in northern regions using native tree species.
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DOI：
10.1016/j.chemosphere.2011.04.058
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发表时间：
2011-06
期刊：
影响因子：
8.8
通讯作者：
Leigh MB
中科院分区：
文献类型：
--
作者：
Slater H;Gouin T;Leigh MB
多氯联苯的微生物修复提供了一种潜在的廉价方法来修复污染土壤，在包括北极在内的偏远地区特别有吸引力。我们评估的能力，两个树种原产于阿拉斯加，柳alaxensis（毡叶杨柳）和云杉（白色云杉），以促进微生物降解的多氯联苯通过释放植物化学物质后细根死亡。粉碎的细根，联苯（PCB类似物）或水杨酸盐（杨柳二级化合物）被添加到含有多氯联苯和由此产生的PCB消失，土壤毒性和微生物群落的变化进行了研究。180 d后，杨柳根crushates处理的土壤显示出显着更大的PCB损失比未经处理的土壤中的一些PCB同系物，包括有毒的同系物，PCB 77，105和169，并表现出类似的PCB损失模式（在降解程度和同系物降解）联苯处理的缩影。无论是P. glauca（白色云杉）的根，也没有水杨酸盐增强PCB的损失，表明生物刺激是植物物种特异性的，并不介导水杨酸盐。使用Microtox生物测定法评估的土壤毒性表明，杨柳处理导致毒性较小的土壤环境。分子微生物群落分析表明，联苯和水杨酸促进微生物群落结构和组成的变化，明显不同于彼此和破碎的根治疗。利用联苯的细菌贪铜菌（Cupriavidus spp.）从土壤中分离出来。研究结果表明，S.阿拉善植物可能通过改变土壤微生物群落结构、促进某些PCB同系物的流失和降低土壤环境毒性而成为一种有效的根际修复植物。
Rhizosphere bioremediation of polychlorinated biphenyls (PCBs) offers a potentially inexpensive approach to remediating contaminated soils that is particularly attractive in remote regions including the Arctic. We assessed the abilities of two tree species native to Alaska, Salix alaxensis (felt-leaf willow) and Picea glauca (white spruce), to promote microbial biodegradation of PCBs via the release of phytochemicals upon fine root death. Crushed fine roots, biphenyl (PCB analogue) or salicylate (willow secondary compound) were added to microcosms containing soil spiked with PCBs and resultant PCB disappearance, soil toxicity and microbial community changes were examined. After 180 d, soil treated with willow root crushates showed a significantly greater PCB loss than untreated soils for some PCB congeners, including the toxic congeners, PCB 77, 105 and 169, and showed a similar PCB loss pattern (in both extent of degradation and congeners degraded) to biphenyl-treated microcosms. Neither P. glauca (white spruce) roots nor salicylate enhanced PCB loss, indicating that biostimulation is plant species specific and was not mediated by salicylate. Soil toxicity assessed using the Microtox bioassay indicated that the willow treatment resulted in a less toxic soil environment. Molecular microbial community analyses indicated that biphenyl and salicylate promoted shifts in microbial community structure and composition that differed distinctly from each other and from the crushed root treatments. The biphenyl utilizing bacterium, Cupriavidus spp. was isolated from the soil. The findings suggest that S. alaxensis may be an effective plant for rhizoremediation by altering microbial community structure, enhancing the loss of some PCB congeners and reducing the toxicity of the soil environment.
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影响因子：
11.4
作者：
Leigh, MB;Fletcher, JS;Schmitz, FJ
通讯作者：
Schmitz, FJ
影响因子：
3.2
作者：
Fujihara, Hidehiko;Yoshida, Hideyuki;Furukawa, Kensuke
通讯作者：
Furukawa, Kensuke
影响因子：
4.4
作者：
Gilbert, ES;Crowley, DE
通讯作者：
Crowley, DE
DOI：
10.1016/j.ibiod.2009.03.009
发表时间：
2009-09-01
影响因子：
4.8
作者：
Ionescu, Marieta;Beranova, Katarina;Mackova, Martina
通讯作者：
Mackova, Martina
影响因子：
4.4
作者：
Leigh, MB;Prouzová, P;Fletcher, JS
通讯作者：
Fletcher, JS