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Microbiology and Biotechnology Letters

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Microbiol. Biotechnol. Lett. 2008; 36(4): 326-335

Bacillus subtilis AH18의 고추역병 방제능과 $Siderophore_{AH18}$의 구조분석

Structural Identification of $Siderophore_{AH18}$ from Bacillus subtilis AH18, a Biocontrol agent of Phytophthora Blight Disease in Red-pepper

Sang-Min Woo and Sang-Dal Kim

Department of Applied Microbiology, Yeungnam University, 1Department of Applied Microbiology, Yeungnam University

Abstract

The siderophore ($siderophore_{AH18}$) of Bacillus subtilis AR18 was determined to be one of catechol type and purified by using Amberlite XAD-2, Sephadex LR-20 chromatography, and reversed-phase RPLC. The $Siderophore_{AH18}$ was identified bacillibactin with its structure by GC-MS, $^1H$-NMR, and $^{13}C$-NMR. $Siderophore_{AH18}$ (bacillibactin) had been confirmed its molecular weight of 883 and chemical structure of $(2,3-dihydroxybenzoate-glycine-threonine)_3$. Purified $siderophore_{AH18}$ showed strong biocontrol ability towards the spore of Phytophthora capsici on PDA and able to effectively suppress (55%) P. capsici causing red-pepper blight in the pot in vivo test.

Keywords: Bacillibactin, PGPR (plant growth promoting rhizobacterium), siderophore, Bacillus subtilis AH18

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