Antagonistic activity of Streptomyces species against Fusarium solani causing ginseng root rot
1989
Chung, Y.R. (Korea Research Institute of Chemical Technology, Taejon (Korea R.). Chemical Technology) | Ohh, S.H. (Korea Ginseng and Tobacco Research Institute, Suwon (Korea R.). Laboratory of Phytopathology) | Chung, H.S. (Seoul National Univ., Suwon (Korea R.). Coll. of Agriculture)
Antagonistic effects of Streptomyces species against Fusarium solani causing ginseng root rot were investigated in terms of chitinase activity and growth inhibition in vitro. Among 131 isolates of streptomycetes obtained from ginseng cultivating soil, 9 isolates producing large clear zone around the colony on a chitin agar medium were selected for further study. All 9 isolates produced chitinase in a range from 0.10 to 0.38 U lysing cells of F. solani and inhibited germination of the conidia. In the ten-fold concentrated culture filtrate of S. alboniger ST59 and S. roselilacinus ST129, the number ST59 and F. solani were grown simultaneously in the mineral salt medium, chitinase activity increased with incubation period, whereas mycelial volume of F. solani decreased. In a chitin added mineral salt medium, chitinase activity increased during the first four days and maintained steady level until the 8th day, and increased thereafter. S. alboniger ST59 lysed mycelia, conidia and even chlamydospores of F. solani. It is probable that the antagonistic activity of this streptomycete against F. solani is the lysis of fungal cell wall by streptomycete producing chitinase affected by antifungal substances
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