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KMID : 1160220020300010031
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Mycobiology
2002 Volume.30 No. 1 p.31 ~ p.36
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Selection and Efficacy of Soil Bacteria Inducing Systemic Resistance Against Colletotrichum orbiculare on Cucumber
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Kwack Min-Sun
Park Seung-Gyu
Jeun Yong-Chull
Kim Ki-Deok
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Abstract
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Soil bacteria were screened for the ability to control cucumber anthracnose caused by Colletotrichum orbiculare through induced systemic resistance (ISR). Sixty-four bacterial strains having in vitro antifungal activity were used for selecting ISRinducing strains in cucumber. Cucumber seeds (cv. Baeknokdadagi) were sown in potting mixtures incorporated with the soil bacteria, at a rate of ca. 108 cells per gram of the mixture. Two week-old plants were then transplanted into the steamsterilized soil. Three leaf-stage plants were inoculated with a conidial suspension (5×105 conidia/ml) of C. orbiculare. Diseased leaf area (%) and number of lesions per cm2 leaf were evaluated on third leaves of the plants, 5~6 days after inoculation. Among 64 strains tested, nine strains, GC-B19, GC-B35, GK-B18, MM-B22, PK-B14, RC-B41, RC-B64, RC-B65, and RCB77 significantly (P = 0.05) reduced anthracnose disease compared to the untreated control. In contrast, some bacterial strains promoted susceptibility of cucumber to the disease. From the repeated experiments using the nine bacterial strains, GCB19, MM-B22, PK-B14, and RC-B65 significantly (P = 0.05) reduced both diseased leaf area (%) and number of lesions per cm2 leaf in at lease one experiment. These strains with control efficacy of 37~80% were determined to be effective ISRinducing strains.
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KEYWORD
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Anthracnose, Colletotrichum orbiculare, Cucumber, Induced systemic resistance, Soil bacteria
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