A bacterial strain YC5194 that showed antifungal activity against Colletotrichum gloeosporioides was isolated from the rhizosphere soil of pepper root collected at Jinju. The strain inhibited the growth of mycelia and the formation of appressorium of ...
A bacterial strain YC5194 that showed antifungal activity against Colletotrichum gloeosporioides was isolated from the rhizosphere soil of pepper root collected at Jinju. The strain inhibited the growth of mycelia and the formation of appressorium of C. gloeosporioides. Mycelial growth of the plant fungal pathogens such as Fusarium oxysporum, Botrytis cinerea, Rhizoctonia solani, Botryosphaeria dothidea was also inhibited by this isolate. Identification of the isolate was conducted using biochemical and molecular biological characterization. Cells of the strain were gram-negative, rod-shaped and facultatively anaerobes and grow at 15℃ to 37℃. The bacterial strain YC5194 was identified as a new species of Lysobacter based on its physiological, biochemical characteristics and 16S rDNA sequences. The antibiotic compound in culture media was extracted by butanol partitioning and purified by RP-18 chromatography and preparative HPLC. The purified antibiotic compound appears to be a novel compound and stable at high temperatures and all pH conditions.