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

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

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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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eISSN 2234-7305
pISSN 1598-642X

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Jung HK, Kim JR, Woo SM, Kim SD. An Auxin Producing Plant Growth Promoting Rhizobacterium Bacillus subtilis AH18 which has Siderophore-Producing Biocontrol Activity. Kor. J. Microbiol. Biotechnol 2006;34:94-100.

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eISSN 2234-7305
pISSN 1598-642X

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Auxin과 Siderophore 생산성 다기능 생물방제균 Bacillus subtilis AH18