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http://dx.doi.org/10.3839/jabc.2009.021

Effects of Phytophthora Blight-antagonistic Microorganisms Bacillus subtilis AH18 and Bacillus licheniformis K11 on the Soil Microbial Community  

Park, Kee-Choon (Ginseng Research Division, Rural Development Administration)
Lim, Jong-Hui (Department of Applied Microbiology, College of Natural Resources, Yeungnam University)
Kim, Sang-Dal (Department of Applied Microbiology, College of Natural Resources, Yeungnam University)
Yi, Young-Keun (School of Bioresource Science, Andong National University)
Publication Information
Journal of Applied Biological Chemistry / v.52, no.3, 2009 , pp. 121-125 More about this Journal
Abstract
We measured the influence of antifungal antagonists Bacillus subtilis AH18 and Bacillus licheniformis K11 on soil microbial community in microcosms. Both antifungal antagonists were confirmed to suppress hot pepper phytophthora blight. Phospholipid fatty acids (PLFA) were analyzed to investigate the soil microbial community. B. subtilis AH18 changed the total PLFA composition and bio-indicators of PLFA, compared with other treatments. B. subtilis AH18 decreased the proportion of bacteria and gram negative/gram positive bacteria, and increased the fungi/bacteria and anaerobic/aerobic microorganisms. In addition cy19:0/18:$1{\omega}7c$, which means adaptation to unfavorable environmental conditions, was increased by the application of B. subtilis AH18. On the other hand the inoculation of B. licheniformis K11 or combined inoculation of both antifungal strains did not affect soil microbial community. The suppression of phytophthora blight and preservation of indigenous soil microbial community may be achieved by the combined application of B. subtilis AH18 and B. licheniformis K11.
Keywords
antifungal antagonist; microbial control agent; soil microbial community;
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