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길항균 Bacillus subtilis CAP134의 대량생산을 위한 배양조건
박훙섭 ( Park Heung-sub ),조정일 ( Cho Jung-ii ) 한국유기농업학회 1996 韓國有機農業學會誌 Vol.5 No.1
Cultural conditions for mass production of the antagonistic bacteria, Bacillus subtilis CAP134 against pathogens causing major airborne diseases to apple trees, effects of temperature, pH, carbon and nitrogen source in the culture broth were investigated. The bacterial growth was most vigorous when the temperature and pH of the culture broth was 30℃~35℃ and 7, respectively. As for carbon source, dextrose was best followed in order by dextrose(monosaccharides)>sucrose(disaccharides)≥saccharose (di-saccharides)>starch(polysaccharides). Among different sugars, bacterial growth was favored by in the order of brown, black and white sugars, indicating that the bacterial growth might be promoted by the minor elements presented as impurities in the less purified sugars. As for nitrogen source, organic forms were better to bacterial growth than inorganic forms, that is polypeptone was best followed in order by soy sauce, soybean milk and inorganic nitrogens. Differences in bacterial growth among different forms of inorganic nitrogen were negligible.
박홍섭 ( Park Heung-sub ),조정일 ( Cho Jung-ii ) 한국유기농업학회 1996 韓國有機農業學會誌 Vol.5 No.1
For the purpose of acquiring microbial agents that can be utilized to biologically control the major airborne diseases to apple trees, such as canker(Botryosphaeria dothidea), bitter rot(Glomerella cingulata), altemaria leaf spot(Alternaria mali), root rot(Rosellinia necatrix), canker(Valsa ceratosperma) and gray mold rot(Botrytis cinerea), the effective microorgaisms were isolated, tested for antagonistic activity to the pathogens causing major diseases to apple trees and identifed. Screening of more than 5,000 species of microorganisms collected in nature for them antagonistic action to the pathogens causing 5 major diseases to apple trees resulted in selection of effective species. Out of the 11 species, one species designated as CAP134 demonstrated outstanding activity. The bacterial strain, CAP134 exerted antagonistic efficiency of 57% on an isolated strain and 40% on a donated strain of Botryosphaeria dothidea., 52% on an isolated strain and 46% on a purchased strain of Altemaria mali, 60% on Valsa ceratosperma 25% on Glomerella cingulata, and 64% Rosellinia necatrix. The CAP134 was identified as a bacterial strain to Bacillus subtilis ATCC 6633 based on morphology, culture conditions, and physio-biochemical characteristics.