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Characterization of Bacillus luciferensis Strain KJ2C12 from Pepper Root, a Biocontrol Agent of Phytophthora Blight of Pepper

Authors
Kim, Hye-SookSang, Mee KyungMyung, Inn-ShikChun, Se-ChulKim, Ki Deok
Issue Date
Mar-2009
Publisher
KOREAN SOC PLANT PATHOLOGY
Keywords
Antagonistic bacteria; Bacillus luciferensis; Biological control; Phytophthora capsici
Citation
PLANT PATHOLOGY JOURNAL, v.25, no.1, pp.62 - 69
Indexed
SCIE
SCOPUS
KCI
Journal Title
PLANT PATHOLOGY JOURNAL
Volume
25
Number
1
Start Page
62
End Page
69
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/120459
DOI
10.5423/PPJ.2009.25.1.062
ISSN
1598-2254
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 MgSO4 buffer-treated controls. Strain KJ2C12 produced significantly higher microbial activity than the MgSO4-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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