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Microbiology and Biotechnology Letters

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Microbiol. Biotechnol. Lett. 2006; 34(2): 94-100

Auxin과 Siderophore 생산성 다기능 생물방제균 Bacillus subtilis AH18

An Auxin Producing Plant Growth Promoting Rhizobacterium Bacillus subtilis AH18 which has Siderophore-Producing Biocontrol Activity

Hee-Kyoung Jung , Jin-Rak Kim , Sang-Min Woo and Sang-Dal Kim

Department of Applied Microbiology, College of Natural Resources, Yeungnam University, 1Department of Applied Microbiology, College of Natural Resources, Yeungnam University, 2Department of Applied Microbiology, College of Natural Resources, Yeungnam University, 3Department of Applied Microbiology, College of Natural Resources, Yeungnam University

Abstract

To isolate a bacterium that produces plant growth promoting hormone, a total of 29 bacteria were obtained from the soil in Gyeongsan, Korea. Among these, 14 strains were selected by their positive reaction on Salkowski to produce auxin. All of these were then tested for their property to produce siderophore using CAS (chrome azurol S) blue agar, and one was chosen for its ability to produce both, auxin and siderophore. This strain, denoted, AHl8, showed 1.5 times higher adventitious root induction rates than controls, using mung-beans. The strain also showed efficient biocontrol properties towards Fusarium-wilt of tomatoes in artificial pot assays. The strain was identified as Bacillus subtilis by 16s rDNA comparison and Biolog analyses. Growth and media conditions for Bacillus subtilis AH1 8 to highly produce siderophore were also investigated.

Keywords: Biocontrol, siderophore, auxin, Fusarium oxysporum, Bacillus subtilis

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