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http://dx.doi.org/10.4489/KJM.2013.41.2.112

Antifungal Activity of Bacillus sp. GJ-1 Against Phytophthora capsici  

Lee, Gun-Joo (Department of Applied Biology, Kangwon National University)
Han, Joon-Hee (Department of Applied Biology, Kangwon National University)
Shin, Jong-Hwan (Department of Applied Biology, Kangwon National University)
Kim, Heung Tae (Department of Plant Medicine, Chungbuk National University)
Kim, Kyoung Su (Department of Applied Biology, Kangwon National University)
Publication Information
The Korean Journal of Mycology / v.41, no.2, 2013 , pp. 112-117 More about this Journal
Abstract
Phytophthora capsici is one of major limiting factors in production of pepper and other important crops worldwide by causing foliage blight and rot on fruit and root. Increased demand for the replacement of fungicides has led to searching a promising strategy to control the fungal diseases. To meet eco-friendly agriculture practice, we isolated microorganisms and assessed their beneficial effects on plant health and disease control efficacy. A total of 360 bacterial strains were isolated from rhizosphere soil of healthy pepper plants, and categorized to 5 representative isolates based on colony morphology. Among the 5 bacterial strains (GJ-1, GJ-4, GJ-5, GJ-11, GJ-12), three bacterial strains (GJ-1, GJ-11, GJ-12) presented antifungal activity against P. capsici in an fungal inhibition assay. In phosphate solubilization and siderophore production, the strain GJ-1 was more effective than others. The strain GJ-1 was identified as Bacillus sp. using 16S rDNA analysis. Bacillus sp. GJ-1 was also found to be effective in inhibiting other plant pathogenic fungi, including Rhizoctonia solani, Pythium ultimum and Fusarium solani. Therefore, the Bacillus sp. GJ-1 can serve as a biological control agent against fungal plant pathogens.
Keywords
Antifungal activity; Biological control; Phosphate solubilization; Siderophore;
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