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http://dx.doi.org/10.3839/jabc.2013.038

Characterization of Microbial Nitrate Uptake by Bacillus sp. PCE3  

Yun, Yeong-Bae (Department of Environmental and Biological Chemistry, Chungbuk National University)
Park, Soo-Jin (Department of Environmental and Biological Chemistry, Chungbuk National University)
Han, Min-Woo (Department of Environmental and Biological Chemistry, Chungbuk National University)
Kim, Young-Kee (Department of Environmental and Biological Chemistry, Chungbuk National University)
Publication Information
Journal of Applied Biological Chemistry / v.56, no.4, 2013 , pp. 241-244 More about this Journal
Abstract
Nitrate is one of the major nutrients in plants, and nitrate fertilizer often overused for the high yields of crops. Nitrate deposit in soil became one of the major reasons causing salt stress. Specially, salt stress is a serious problem in the soils of plastic film or glass houses. In this study, six microorganisms have been isolated from the wet soils near the disposals of livestock farms and their nitrate uptake activities were investigated. These bacteria were able to remove nitrate as high as 1,000-3,000 ppm (10-50 mM). The strain PCE3 showed the highest nitrate uptake activity and it removed more than 3,700 ppm. In order to identify these bacteria, genes of 16S rRNA were sequenced and analyzed. Phylogenetic trees were constructed with the neighbor-joining methods. Among these bacteria, strain PCE3 was identified as Bacillus species. When the growth and nitrate uptake activities were measured, both were maximal at $37^{\circ}C$ and optimal pH was pH 7-9. Bacillus sp. PCE3 removed nitrate up to 40-60 mM (2,500-3,700 ppm) depending on the nitrate concentration in media. Therefore, Bacillus sp. PCE3 can be a good candidate for the microbial remediation of nitrate-deposited soils in glass and plastic film houses.
Keywords
microbial remediation; nitrate uptake; salt stress; soil microorganism;
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