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Microbiology and Biotechnology Letters

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Microbiol. Biotechnol. Lett. 2010; 38(3): 302-307

습지에서 분리한 질소고정 세균인 Mycobacterium hominis sp. AKC-10의 특성

Characterization of a Nitrogen Fixing Bacteria Mycobacterium hominis sp. AKC-10 Isolated from the Wetland

Sun-Hwa Hong , Ki-Chul Shin and Eun-Young Lee

Department of Environmental Engineerin and Environmental Microbiology, Suwon University, 1Department of Environmental Engineerin and Environmental Microbiology, Suwon University, 2Department of Environmental Engineerin and Environmental Microbiology, Suwon University

Abstract

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Nitrogen is an element need to grow plants growth. Plants take up nitrogen in the form of nitrate or ammonium. Most of plants absorb nitrogen source as fertilizers. But from 50 to 70% of fertilizers applied were washed away. This study was conducted to isolate free-living nitrogen fixing bacteria from reed and to examine its beneficial traits for developing sustainable biofertilizers. Enriched consortium obtained from a reed in Ansan was developed for the fixing of nitrogen. Nitrogen fixing bacteria isolated from an enriched culture in Congo Red Medium was analyzed by 16s rDNA sequencing. AKC-10 was isolated and shown to have excellent nitrogen fixing ability. The optimum conditions of nitrogen fixing ability were $25^{circ}C$ ($237.50{pm}39.65;nmole{cdot}mg-protein^{-1}{cdot}h^{-1}$ and pH 7 ($168.335{pm}12.84$ nmole/hr mg-protein). It was identified as Microbacterium hominis [(AKC-10 (similarity : 99%)]. This strain was had to IAA (indole-3-acetic acid) productivity and ACC(1-aminocyclopropane-1-carboxylic acid) deaminase activity. Therefore, Microbacterium hominis AKC-10 stimulated plant development in the soil, enhancing the efficiency of remediation.

Keywords: Mycobacterium hominis sp., nitrogen, nitrogen fixing bacteria, plant growth-promoting rhizobacteria

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