Cultural Characteristics of Antagonistic Bacterium, Bacillus licheniformis N1 against Botrytis cinerea

잿빛공팜이에 대한 길항균 Bacillus Iicheniformis N1의 배양적 특성

This study was conducted to estimate the cultural characteristics, the production of antibiotic, and the selection of optimal media for mass culture of Bacillus licheniformis N1 isolate which was previously reported as an antagonistic bacterium to Botrytis cinerea. We investigated initial pH, temperatures and shaking speed for good cultural conditions and antibiotics production by N1 isolate. According to the results, the optimal conditions of initial pH, temperatures, and shaking speed were determined to be pH 5.0~5.5, 30~35$^{\circ}C$ and 250 rpm, respectively. Also, the optimal conditions for the antagonism by N1 isolate highly appeared in the initial pH as 5.0, and the mycelial growth inhibition was high when the substances used such as glucose or corn starch as carbon sources, and biji(soybean curd residue) flour as a nitrogen source. Furthermore, inhibitory area was significantly expanded, when 3% or 5% of corn starch was added into 5% of Biji flour as nitrogen source, were respectivley selected for mass culture of N1 isolate. Among them, 5% Biji flour medium showed higher cell density more than 10 times that in NB medium after 48 hour incubation. Therefore, the optimal medium was determined as 5% biji flour added 3~5% of corn starch for high density of cells.