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벼 깨씨무늬병 및 잎집썩음병에 항진균 활성을 갖는 길항 미생물의 탐색

Screening of Antagonistic Bacteria Having Antifungal Activity against Brown Spot and Sheath Rot of Rice

한국균학회지 2019년 47권 3호 p.259 ~ 269
류명선 ( Ryu Myeong-Seon ) - (재)발효미생물산업진흥원

양희종 ( Yang Hee-Jong ) - (재)발효미생물산업진흥원
정수지 ( Jeong Su-Ji ) - (재)발효미생물산업진흥원
서지원 ( Seo Ji-Won ) - (재)발효미생물산업진흥원
 ( Jeong Do-Youn ) - (재)발효미생물산업진흥원

Abstract


Brown spot and sheath rot of rice are caused by fungal pathogens such as Curvularia lunata, Cochliobolus miyabeanus, and Sarocladium oryzae, and cause losses such as reduced rice yield and quality, which is an enormous problem with serious long-term effects. To search biological control agents of phytopathogenic fungi, five kinds of useful Bacillus-like isolates which are excellent in extracellular enzyme activity and produce siderophore were selected from paddy soil of Sunchang in Korea. The selected isolates were tested for excellent antifungal activity against three of the phytopathogenic fungi that frequently occur in rice, and JSRB 177 strain had the most excellent antifungal activity. Based on the experimental results, JSRB 177 is finally selected as a candidate for biological control and identified to Bacillus subtilis through 16S rRNA sequence analysis. In addition, physiological characteristics of JSRB 177 confirmed by analysis of carbohydrate fermentation patterns and enzyme production ability. Based on the above results, JSRB 177 is expected to be used as a biological control agent for the rice pathogenic fungi. In the future, further studies related to industrialization such as port test and establishment of mass production process are needed.

키워드

Antagonistic bacteria; Bacillus subtilis; Biological control agents; Brown spot; Sheath rot
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