The Plant Pathology Journal

The Korean Society of Plant Pathology (한국식물병리학회)
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Laboratory Culture Media-Dependent Biocontrol Ability of Burkholderia gladioli strain B543

  • Bae, Yeoung-Seuk (Plant Pathology Division, National Institute of Agricultural Science and Technology, Rural Development Administration) ;
  • Park, Kyung-Seok (Plant Pathology Division, National Institute of Agricultural Science and Technology, Rural Development Administration) ;
  • Choi, Ok-Hee (Department of Applied Biology and Environmental Science, Gyeongsang National University)
  • Published : 2007.09.30
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Abstract

Cultivation of a biocontrol agent on a certain medium often results in reduced biocontrol efficacy and alters physiological state. In our previous study, Burkholderia gladioli strain B543 with long-term subculture on tryptic soy agar resulted in significantly reduced biocontrol ability against cucumber damping-off caused by P. ultimum. Therefore, we investigated the influence of laboratory culturing media on biocontrol activity and physiological state of Burkholderia gladioli strain B543 by using long-term repeated culture on a certain medium. When isolate B543 were successionally cultured on King's B agar (KBA), tryptic soy agar, nutrient agar (NA), or soil extract agar more than 20 times, the isolate cultured on KBA or NA showed a significantly enhanced biocontrol efficacy and higher population density in the rhizosphere of cucumber compared to that of the others. However, the isolates cultured on KBA more than 20 times showed the lowest production of protease, siderophore, or antifungal substance(s), measured by skim milk agar, Chrome-Azurol-S agar, and potato dextrose agar amended with 10% of the culture filtrate, respectively. Our results suggest that adaptation to proper culturing medium can alter biocontrol ability and physiological state, and we must consider laboratory media in optimizing the use of biocontrol agents.

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References

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