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Physiological Characterization of BTEX Degrading Bacteria Microbacterium sp. EMB-1 and Rhodococ-cus sp. EMB-2 Isolated from Reed Rhizosphere of Sunchon Bay  

Kang Sung-Mi (Department of Environmental Education, Sunchon National Univeristy)
Oh Kye-Heon (Department of Life Science, Sonnchunhyang University)
Kahng Hyung-Yeel (Department of Environmental Education, Sunchon National Univeristy)
Publication Information
Microbiology and Biotechnology Letters / v.33, no.3, 2005 , pp. 169-177 More about this Journal
Abstract
This study focuses on investigating roles of microorganisms in decontamination of reed rhizosphere in Sunchon Bay, Korea, which is considered one of the marsh and mud environment severely affected by human activities such as agriculture and fisheries. In general, the bay is known to play the role of the buffering zone to reduce the sudden impact or change by environmental stresses. In our initial efforts to elucidate the microbial functions in decontamination process in reed rhizosphere, pure bacteria capable of degrading aromatic hydrocarbons were isolated from reed (Phragmites communis) rhizosphere of Sunchon bay by enrichment culture using either benzene, toluene, ethylbenzene, or xylene (BTEX) as a sole source of carbon and energy. Measurement of the rates of BTEX degradation and cell growth during the incubation in BTEX media under several temperature conditions demonstrated maximized degradation of BTEX at $37^{\circ}C$ in both strains. Both strains were also resistant to all the heavy metals and antibiotics tested in this study, as well as they grew well at $42^{\circ}C$. Identification of the isolates based on 16S rRNA gene sequences, and a variety of phenotypic and morphologic properties revealed that the two strains capable of BTEX catabolism were among Microbacterium sp., and Rhodococcus sp. with over $95{\%}$ confidence, designated Microbacterium sp. EMB-1 and Rhodococcus sp. EMB-2, respectively This result suggested that in the rhizosphere of reed, one of major salt marsh plants they might play an important roles in decontamination process of reed rhizosphere contaminated with petroleum such as BTEX.
Keywords
Sunchon bay; reed rhizosphere; BTEX; Phragmites communis;
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