The Plant Pathology Journal

The Korean Society of Plant Pathology (한국식물병리학회)
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Biocontrol of Korean Ginseng Root Rot Caused by Phytophthora cactorum Using Antagonistic Bacterial Strains ISE13 and KJ1R5

  • Sang, Mee-Kyung (Division of Bioscience and Technology, College of Life and Environmental Sciences, Korea University) ;
  • Chiang, Mae-Hee (Division of Environmental and Life Sciences, College of Natural Sciences, Seoul Women s University) ;
  • Yi, Eun-Seob (Gyeonggido Agricultural Research and Extension Service) ;
  • Park, Kuen-Woo (Division of Bioscience and Technology, College of Life and Environmental Sciences, Korea University) ;
  • Kim, Ki-Deok (Division of Bioscience and Technology, College of Life and Environmental Sciences, Korea University)
  • Published : 2006.03.01
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Abstract

In this biocontrol research, we evaluated disease suppressive effects of antagonistic bacterial strains ISE13 and KJ1R5 against Korean ginseng root rot caused by P. eaetorum. We also examined the effects of nutrient solution in the hydroponic culture system for Korean ginseng on biological activity of the bacterial strains. As results of dual culture tests of the bacterial strains on $V_{8}$ juice agar, the strain ISE13 showed antifungal activity against P. eaetorum and other plant pathogenic fungi, but the strain KJ1R5 did not. When their inhibitory effects against infection of P. eaetorum on the roots grown in either nutrient solution or water were tested, the strains ISE13 and KJ1R5 inhibited the disease severity of Korean ginseng roots only grown with water, compared to buffer-treated, inoculated controls. However, the nutrient solution used for hydroponic cultures of ginseng in pots caused higher levels of disease severity by the strains ISE13 and KJ1R5 from 418.8\%$ to 40.0\%$ and from 24.3\%$ to 45.0\%$, respectively. In this study, the bacterial strains ISE13 and KJ1R5 could be potentially biocontrol agents to suppress Korean ginseng root rot caused by P. eaetorum. However, more attention using nutrient solution in hydroponic cultures for Korean ginseng production should be applied in biocontrol of plant diseases using the antagonistic microorganisms.

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References

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