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Microbiology and Biotechnology Letters

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Microbiol. Biotechnol. Lett. 2007; 35(1): 58-65

중금속 내성 및 식물 생장 향상 근권세균 Methylobacterium sp. SY-NiR1의 분리 및 특성

Characterization of a Heavy Metal-Resistant and Plant Growth-Promoting Rhizobacterium, Methylobacterium sp. SY-NiR1

So-Yeon Koo and Kyung-Suk Cho

Department of Environmental Science and Engineering, Ewha Womans University, 1Department of Environmental Science and Engineering, Ewha Womans University

Abstract

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The role of soil microorganisms, specifically rhizobacteria, in the development of rhizoremediation techniques is important to speed up the process and to increase the rate of mobilization or absorption of heavy metals to the plant. In this study, Methylobacterium sp. SY-NiR1 was isolated from the rhizosphere soils of plants in oil and heavy metal-contaminated soil. Based on its pink pigmented colony, rod-shape cells, and belonging in $alpha-Proteobacteria$, Methylobacterium sp. SY-NiR1 is considered a pink-pigmented facultative methylotroph. SY-NiR1 had the ability to produce indole acetic acid which is one of phytohormones. This bacterium showed resistance against multiple heavy metals such as Cd, Cr, Cu, Pb, Ni, Zn, and the order of its resistance based on $EC_{50}$ was Zn > Ni > Cu > Pb > Cd > Cr. Therefore, Methylobacterium sp. SY-NiR1 can stimulate seed germination and plant growth in soil contaminated with heavy metals.

Keywords: Phytoremediation, heavy metal, Methylobacterium, plant growth-promoting rhizobacteria (PGPR)

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