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오이 탄저병원균과 잿빛곰팡이병원균에 억제 효과가 있는 방선균 선발

Selection of Antagonistic Soil Actinomycetes Against Both Colletotrichum orbiculare and Botrytis cinerea in Cucumber Plants

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초록

The purpose of this study is to select actinomycetes with antifungal activity against Botrytis cinerea and Colletotrichum orbiculare, which are airborne pathogens in cucumber plants. In 2020, 560 species of actinomycetes were isolated from rhizome soils of various vegetables in Korea; 7 strains showing simultaneous antifungal activity against two pathogens were selected. Finally, strain S20-465 was selected through dual culture and plant assay. This strain was identified as Streptomyces sp. based on 16S rRNA analysis. The culture filtrate of strain S20-465 inhibited mycelial growth of both pathogens by more than 60%. In addition, when cucumber plants were treated with 20-fold and 40-fold diluted culture filtrates of S20-465, lesions caused by B. cinerea and C. orbiculare on cucumber leaves were significantly reduced compared to the control. This results suggest that strain S20-465 produces specific secondary metabolites with antifungal activity against both pathogens.

Abstract

The purpose of this study is to select actinomycetes with antifungal activity against Botrytis cinerea and Colletotrichum orbiculare, which are airborne pathogens in cucumber plants. In 2020, 560 species of actinomycetes were isolated from rhizome soils of various vegetables in Korea; 7 strains showing simultaneous antifungal activity against two pathogens were selected. Finally, strain S20-465 was selected through dual culture and plant assay. This strain was identified as Streptomyces sp. based on 16S rRNA analysis. The culture filtrate of strain S20-465 inhibited mycelial growth of both pathogens by more than 60%. In addition, when cucumber plants were treated with 20-fold and 40-fold diluted culture filtrates of S20-465, lesions caused by B. cinerea and C. orbiculare on cucumber leaves were significantly reduced compared to the control. This results suggest that strain S20-465 produces specific secondary metabolites with antifungal activity against both pathogens.

참고문헌 (36)

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