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KMID : 1234420120400030190
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Korean Journal of Microbiololgy and Biotechnology
2012 Volume.40 No. 3 p.190 ~ p.196
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Selection and Identification of Phytohormones and Antifungal Substances Simultaneously Producing Plant Growth Promoting Rhizobacteria from Microbial Agent Treated Red-pepper Fields
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Jung Byung-Kwon
Lim Jong-Hui
An Chang-Hwan
Kim Yo-Hwan
Kim Sang-Dal
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Abstract
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In this study, a total of more than 1,000 bacteria, including 739 species of aerobic bacteria, 80 species of urease producing bacteria and 303 species of photosynthetic bacteria, were isolated from red-pepper field soils located in the Gyeongsan Province of the Republic of Korea. Amongst these, 158 species of aerobic bacteria, 70 species of urease producing bacteria and 228 species of photosynthetic bacteria were found to be auxin producing soil bacteria through quantification analysis with the Salkowski test. The latter groupings were then tested for antifungal activities to β-Glucanase and siderophore using CMC congo red agar and CAS blue agar media. In addition, the selected strains were examined for antifungal activity against various phytopathogenic fungi on PDN agar media. Six strains; BCB14, BCB17, C10, HA46, HA143, and HJ5, were noted for their ability to both produce auxin and act as antifungal substances. 16S rDNA sequence comparison analyses of these six strains identified them as Bacillus subtilis BCB14, B. methylotrophicus BCB17, B. methylotrophicus C10, B. sonorensis HA46, B. subtilis HA143, and B. safensis HJ5.
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KEYWORD
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microbial agent, phytohormone, PGPR, antifungal activity
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