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KMID : 0364820120480010016
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Korean Journal of Microbiology
2012 Volume.48 No. 1 p.16 ~ p.21
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Antifungal Activity and Plant Growth Promotion by Rhizobacteria Inhibiting Growth of Plant Pathogenic Fungi
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Jung Taeck-Kyung
Kim Ji-Hyun
Song Hong-Gyu
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Abstract
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Since many pesticides cause various health and environmental problems, alternative measures to replace them are
needed, and the bacteria producing the antifungal substances can be one of them. In this study, several rhizobacteria
were isolated and their antifungal activities against some important plant pathogenic fungi were examined.
Pseudomonas otitidis TK1 and Paenibacillus peoriae RhAn32 inhibited the growth of Fusarium oxysporum f. sp.
niveum and F. oxysporum f. sp. lycopersici by 49.8% and 45.6%, and 45.1% and 48.3%, respectively compared to
those of the control. P. peoriae RhAn32 also decreased the growth of F. oxysporum f. sp. raphani by 37.5%. This
growth inhibition might be due to the production of antifungal substances, such as siderophore, hydrogen cyanide
and chitinase, which were produced by these rhizobacteria. P. otitidis TK1 also produced plant growth hormones
indole acetic acid and indole butyric acid at 293.41 μg/mg protein and 418.53 μg/mg protein, respectively. When P.
otitidis TK1 and B. cereus TK2 were inoculated together with F. oxysporum f. sp. lycopersici to the 4 weeks grown
tomato seedlings and incubated additional 8 weeks, the stem lengths of tomato increased up to 45.7% and 55.3% and
root lengths were raised to 64.9% and 60.8%, respectively than those of the control group. The wet weights
increased by 118% and 182%, respectively compared to the control group.
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KEYWORD
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antifungal substances, plant growth promotion, plant pathogenic fungi, rhizobacteria
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