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Applied and Environmental Microbiology, October 1999, p. 4334-4339, Vol. 65, No. 10
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Possible Role of Xanthobaccins Produced by Stenotrophomonas sp. Strain SB-K88 in Suppression of Sugar Beet Damping-Off Disease

Takato Nakayama,1,dagger Yoshihisa Homma,2,Dagger Yasuyuki Hashidoko,1,3 Junya Mizutani,1 and Satoshi Tahara1,3,*

Department of Applied Bioscience, Faculty of Agriculture, Hokkaido University, Kita-ku, Sapporo 060-8589,1 Upland Agriculture Research Center, Hokkaido National Agricultural Experiment Station, Hokkaido 082-0071,2 and CREST, Japan Science and Technology Corporation, 4-1-8 Honmachi, Kawaguchi 332-0012,3 Japan

Received 29 December 1998/Accepted 20 July 1999

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 µg 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.

* Corresponding author. Mailing address: Department of Applied Bioscience, Faculty of Agriculture, Hokkaido University, Kita-ku, Sapporo 060-8589, Japan. Phone: 81-11-706-3840. Fax: 81-11-747-5453. E-mail: tahara{at}abs.agr.hokudai.ac.jp.

dagger Present address: National Agriculture Research Center, 3-1-1 Kan-nondai, Tsukuba 305-8666, Japan.

Dagger Present address: Japan International Research Center for Agricultural Science, 1-2 Owashi, Tsukuba 305-8686, Japan.

Applied and Environmental Microbiology, October 1999, p. 4334-4339, Vol. 65, No. 10
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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