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KMID : 1234420100380030302
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Korean Journal of Microbiololgy and Biotechnology
2010 Volume.38 No. 3 p.302 ~ p.307
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Characterization of a Nitrogen Fixing Bacteria Mycobacterium hominis sp. AKC-10 Isolated from the Wetland
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Hong Sun-Hwa
Shin Ki-Chul
Lee Eun-Young
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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 25oC (237.50 ± 39.65 nmole · mg-protein-1 · h-1 and pH 7 (168.335 ± 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.
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KEYWORD
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Mycobacterium hominis sp., nitrogen, nitrogen fixing bacteria, plant growth-promoting rhizobacteria
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