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http://dx.doi.org/10.11625/KJOA.2015.23.1.77

Search for Plant-originated Antibacterial Compounds Against Pathogen (Acidovorax avenae subsp. citrulli) of Watermelon Bacterial Fruit Blotch  

Noh, Jin-Taek (경북대학교 과학기술대학원 식물생명과학과)
Choi, Yong-Hwa (경북대학교 생태환경대학 생태환경시스템학부)
Publication Information
Korean Journal of Organic Agriculture / v.23, no.1, 2015 , pp. 77-89 More about this Journal
Abstract
133 Species of medicinal plants were used for the development of natural agrichemicals with anti-microbial activity against Acidovorax avenae subsp. citrulli, a pathogen of bacterial fruit blotch in watermelon. The MeOH-extracts of these medicinal plants were examined for anti-microbial activity by bioassay. The MeOH-extract of Citrus unshiu Markovich had the strongest antibacterial activity against Acidovorax avenae subsp. citrulli. To identify anti-microbial compounds from Citrus unshiu Markovich, solvent-fractionation was used. The fraction of hexane, which showing the highest value of anti-microbial activity, was analyzed by GC-MS. Each mass spectra, corresponding to each peak of chromatogram, was compared to mass database of Wiley library. As a result, d-Limonene, ${\gamma}$-terpinene, ${\beta}$-linalool, terpineol, palmitic acid, 9,12-octadecadienoic acid, Linolenic acid, and stigmasterol were identified. Among them, d-Limonene, ${\gamma}$-terpinene, ${\beta}$-linalool, and terpineol confirmed to be shown the anti-microbial activity by bioassay. Especially, d-Limonene and ${\gamma}$-terpinene found to have strong activity. In conclusion, we thought d-limonene and ${\gamma}$-terpinene from Citrus unshiu Markovich. Latin, had anti-microbial activity against Acidovorax avenae subsp. citrulli and could be candidates for the control agents for the control of bacterial fruit blotch in watermelon.
Keywords
acidovorax avenae subsp. cirulli; bacterial fruit blotch; citrus unshiu markovich; d-limonene; ${\gamma}$-terpinene;
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