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Plant-microbe association for rhizoremediation of chloronitroaromatic pollutants with Comamonas sp. strain CNB-1.

Comamonas sp. strain CNB-1, isolated from activated sludge and having a strong ability to degrade 4-chloronitrobenzene (4CNB), was applied for rhizoremediation of 4CNB-polluted soil through association with alfalfa. Confocal laser scanning microscopy revealed that strain CNB-1 successfully colonized alfalfa roots. Determination of strain CNB-1 populations by cultivation method and by quantitative competitive PCR technique targeting the chloronitrobenzene nitroreductase gene showed that the population of strain CNB-1 in the rhizosphere was about 10-100 times higher than that in the bulk soil. Gnotobiotic and outdoor experiments showed that pollutant 4CNB was completely removed within 1 or 2 days after 4CNB application into soil, and that its phytotoxicity to alfalfa was eliminated by inoculation of strain CNB-1. Results from PCR-denaturing gradient gel electrophoresis and analysis of 16S rRNA gene libraries revealed that the indigenous soil microbial community mainly consisted of alphaproteobacteria, betaproteobacteria, gammaproteobacteria, the CFB bacteria (Cytophaga-Flavabacterium-Bacteriodes), and Acidobacteria. This microbial community was not significantly influenced by inoculation of strain CNB-1. Thus, this study has developed a Comamonas-alfalfa system for rhizoremediation of 4CNB.[1]

References

  1. Plant-microbe association for rhizoremediation of chloronitroaromatic pollutants with Comamonas sp. strain CNB-1. Liu, L., Jiang, C.Y., Liu, X.Y., Wu, J.F., Han, J.G., Liu, S.J. Environ. Microbiol. (2007) [Pubmed]
 
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