The Plant Pathology Journal

The Korean Society of Plant Pathology (한국식물병리학회)
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Characterization of Bacillus luciferensis Strain KJ2C12 from Pepper Root, a Biocontrol Agent of Phytophthora Blight of Pepper

  • Kim, Hye-Sook (Laboratory of Plant Disease and Biocontrol, College of Lift Sciences and Biotechnology, Korea University) ;
  • Sang, Mee-Kyung (Laboratory of Plant Disease and Biocontrol, College of Lift Sciences and Biotechnology, Korea University) ;
  • Myung, Inn-Shik (Division of Agricultural Microbiology, National Academy of Agricultural Science, RDA) ;
  • Chun, Se-Chul (Department of Molecular Biotechnology, Konkuk University) ;
  • Kim, Ki-Deok (Laboratory of Plant Disease and Biocontrol, College of Lift Sciences and Biotechnology, Korea University)
  • Published : 2009.03.31
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Abstract

In this study, we characterized the bacterial strain KJ2C12 in relation with its biocontrol activity against Phytophthora capsici on pepper, and identified this strain using morphological, physiological, biochemical, fatty acid methyl ester, and 16S rRNA gene sequence analyses. Strain KJ2C12 significantly (P=0.05) reduced both final disease severity and areas under the disease progress curves of 5-week-old pepper plants inoculated with P. capsici compared to buffer-treated controls. As for the production of antibiotics, biofilms, biosurfactant, extracellular enzyme, HCN, and swarming activity, strain KJ2C12 produced an extracellular enzyme with protease activity, but no other productions or swarming activity. However, Escherichia coli produced weak biofilm only. Strain KJ2C12 could colonize pepper roots more effectively in a gnotobiotic system using sterile quartz sand compared to E. coli over 4 weeks after treatments. However, no bacterial populations were detected in 10 mM $MgSO_4$ buffer-treated controls. Strain KJ2C12 produced significantly higher microbial activity than the $MgSO_4$-treated control or E. coli over 4 weeks after treatments. Bacterial strain KJ2C12 was identified as Bacillus luciferensis based on morphological, physiological, and biochemical characteristics as well as FAME and 16S rRNA gene sequence analyses. In addition, these results suggested that B. luciferensis strain KJ2C12 could reduce Phytophthora blight of pepper by protecting infection courts through enhanced effective root colonization with protease production and an increase of soil microbial activity.

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