根际细菌促进湿地植物中硒和汞的积累。

Rhizosphere bacteria enhance the accumulation of selenium and mercury in wetland plants.

作者信息

Huang CP, Chee N, Terry N

机构信息

University of California, Berkeley, Department of Plant and Microbial Biology, 111 Koshland Hall, Berkeley, CA 94720-310, 2, USA

出版信息

Planta. 1999 Aug 12;209(2):259-263. doi: 10.1007/s004250050630.

DOI:10.1007/s004250050630

PMID:10436229

Abstract

The role of rhizosphere bacteria in facilitating Se and Hg accumulation in two wetland plants, saltmarsh bulrush (Scirpus robustus Pursh) and rabbitfoot grass (Polypogon monspeliensis (L.) Desf.), was studied. Ampicillin-amended plants (i.e., with inhibited rhizosphere bacteria) supplied with Na(2)SeO(4) or HgCl(2) had significantly lower concentrations of Se and Hg, respectively, in roots than plants without ampicillin. These results were confirmed by inoculating axenic saltmarsh bulrush plants with bacteria isolated from the rhizosphere of plants collected from the field; these plants accumulated significantly more Se and Hg compared to axenic controls. Therefore, rhizosphere bacteria can increase the efficiency of Se and Hg phytoremediation by promoting the accumulation of Se and Hg in tissues of wetland plants.

摘要

研究了根际细菌在促进两种湿地植物——盐沼芦苇（Scirpus robustus Pursh）和兔尾草（Polypogon monspeliensis (L.) Desf.）中硒和汞积累方面的作用。用氨苄青霉素处理的植物（即根际细菌受到抑制），在供应Na₂SeO₄或HgCl₂时，其根部的硒和汞浓度分别显著低于未用氨苄青霉素处理的植物。通过用从田间采集的植物根际分离的细菌接种无菌盐沼芦苇植物，证实了这些结果；与无菌对照相比，这些植物积累的硒和汞显著更多。因此，根际细菌可以通过促进湿地植物组织中硒和汞的积累来提高硒和汞植物修复的效率。