title: Possible role of xanthobaccins produced by Stenotrophomonas sp. strain SB-K88 in suppression of sugar beet damping-off disease.
abstract: Three antifungal compounds, designated xanthobaccins A, B, and C, were isolated from the culture fluid of Stenotrophomonas sp. strain SB-K88, a rhizobacterium of sugar beet that suppresses damping-off disease. Production of xanthobaccin A in culture media was compared with the disease suppression activities of strain SB-K88 and less suppressive strains that were obtained by subculturing. Strain SB-K88 was applied to sugar beet seeds, and production of xanthobaccin A in the rhizosphere of seedlings was confirmed by using a test tube culture system under hydroponic culture conditions; 3 microg of xanthobaccin A was detected in the rhizosphere on a per-plant basis. Direct application of purified xanthobaccin A to seeds suppressed damping-off disease in soil naturally infested by Pythium spp. We suggest that xanthobaccin A produced by strain SB-K88 plays a key role in suppression of sugar beet damping-off disease.
authors.affiliation: Department of Applied Bioscience, Faculty of Agriculture, Hokkaido University, Kita-ku, Sapporo 060-8589, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Nakayama
authors.forename: Y
authors.initials: Y
authors.lastname: Homma
authors.forename: Y
authors.initials: Y
authors.lastname: Hashidoko
authors.forename: J
authors.initials: J
authors.lastname: Mizutani
authors.forename: S
authors.initials: S
authors.lastname: Tahara
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D000935:Antifungal Agents / Q000302:isolation & purification / Q000494:pharmacology*; D019663:Chenopodiaceae / Q000382:microbiology*; D018942:Macrolides; D011775:Pythium / Q000187:drug effects*; D012988:Soil Microbiology; D014974:Xanthomonas / Q000502:physiology*
chemical_list: D000900:Anti-Bacterial Agents; D000935:Antifungal Agents; D018942:Macrolides; C122002:xanthobaccin A