Interaction of Cd/Zn hyperaccumulating plant (Sedum alfredii) and rhizosphere bacteria on metal uptake and removal of phenanthrene.
Interaction of Cd/Zn hyperaccumulating plant (Sedum alfredii) and rhizosphere bacteria on metal uptake and removal of phenanthrene.
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DOI：
10.1016/j.jhazmat.2012.01.055
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发表时间：
2012-03
影响因子：
13.6
通讯作者：
W. C. Li;M. Wong
中科院分区：
文献类型：
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作者：
W. C. Li;M. Wong
研究了洋葱伯克霍尔德氏菌（Burkholderia cepacia）对超积累植物东南景天（Sedum alfredii）生长、金属吸收、耐性指数和菲降解的影响。结果表明，接种细菌并没有促进植物生长和金属吸收，但金属转运系数（Cd最高达84%，Zn最高达42%）和耐性指数（地上部最高达23.2%，根部最高达72%）均显著提高。此外，接种细菌还可以缓解As、Cu和Zn的生物富集系数和植物提取效率随污染土壤施用比例的增加而降低的趋势，而Cd和Pb的生物富集系数和植物提取效率则有所增加（分别达到31.2%和124%）。试验结束时，植物和细菌联合处理对菲的去除率可达96.3%。植物对重金属的吸收与磷的积累呈正相关，表明高磷吸收直接参与了植物对重金属的解毒过程，从而增加了植物对磷的需求。在细菌的辅助下，S. alfredii能够承受更高的金属浓度，它也可以提供一个实用的工具，植物修复。
The effects of bacteria (Burkholderia cepacia) on plant growth, metal uptake, tolerance index and phenanthrene degradation by a hyperaccumulating plant (Sedum alfredii) were investigated. It was found that inoculation of bacteria did not enhance plant growth and metal uptake; while both metal translocation factor (up to 84% for Cd and 42% for Zn) and tolerance index (up to 23.2% for shoot and 72% for root) were significantly increased. In addition, inoculation of bacteria also alleviated the reductions of bioaccumulation factor and phytoextraction efficiency of As, Cu and Zn with the increasing proportions of polluted soil applied, while they were even increased for Cd and Pb (up to 31.2 and 124%, respectively). Up to 96.3% of phenanthrene was removed in the treatment with both plant and bacteria at the end of the experiment. A positive correlation between metal and P accumulation in plants was observed, it is suggested that high P uptake is directly involved in metal detoxification and leading to an increased P requirement. With the assistance of bacteria, S. alfredii could be able to withstand higher metal concentrations and it could also provide a practical tool for phytoremediation.