Characterization of phenol and trichloroethene degradation by the rhizobium Ralstonia taiwanensis

Wen Ming Chen, Jo-Shu Chang, Chih Hui Wu, Shu Chen Chang

研究成果: Article

40 引文 斯高帕斯(Scopus)

摘要

Ralstonia taiwanensis is a root nodule bacterium originally isolated from Mimosa sp. in southern Taiwan. Some strains of R. taiwanensis demonstrated the ability to grow on medium containing phenol as the sole carbon source, especially strain TJ86, which was able to survive and grow at phenol concentrations of up to 900 mg/l. The dependence of the phenol degradation rate on the phenol concentration can be described by Haldane's model with a low KS (the apparent half-saturation constant) of 5.46 μM and an extremely high KSI (the apparent inhibition constant) 9075 μM. The optimal phenol degradation rate was 61 μmol/min/g cell, which occurred at a phenol concentration of 228 μM. The phenol-limited growth kinetics of TJ86 by Andrews's model also followed a similar trend to that of phenol degradation, indicating the close links between phenol degradation and cell growth. Strain TJ86 also achieved 100 and 40% degradation for soil samples amended with 500 and 1000 μg phenol/g soil (dry weight) within 9 days, respectively. Moreover, strain TJ86 cometabolically degraded trichloroethene (TCE) after being cultivated with media containing phenol or m-cresol as the carbon substrate. The sequence of the large-subunit phenol hydroxylase (LmPH) gene obtained from TJ86 displayed high homology to that of other phenol-utilizing bacteria. Results from kinetic and phylogenetic analyses suggest that strain TJ86 most likely belongs to group I phenol-degrading bacteria which are considered to be efficient TCE degraders. It is proposed that the symbiotic relationship between rhizobia R. taiwanensis and its host plant Mimosa sp. may have the potential for rhizoremediation of aquatic and soil environments contaminated by phenol and TCE.

原文English
頁(從 - 到)672-680
頁數9
期刊Research in Microbiology
155
發行號8
DOIs
出版狀態Published - 2004 十月 1

All Science Journal Classification (ASJC) codes

  • Microbiology
  • Molecular Biology

指紋 深入研究「Characterization of phenol and trichloroethene degradation by the rhizobium Ralstonia taiwanensis」主題。共同形成了獨特的指紋。

  • 引用此