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. 1999 Oct;65(10):4334-9.
doi: 10.1128/AEM.65.10.4334-4339.1999.

Possible role of xanthobaccins produced by Stenotrophomonas sp. strain SB-K88 in suppression of sugar beet damping-off disease

T Nakayama  1 , Y Homma, Y Hashidoko, J Mizutani, S Tahara
Affiliations

Possible role of xanthobaccins produced by Stenotrophomonas sp. strain SB-K88 in suppression of sugar beet damping-off disease

T Nakayama et al. Appl Environ Microbiol. 1999 Oct.

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.

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Figures

FIG. 1
FIG. 1
Chemical structure of XB-A (6).
FIG. 2
FIG. 2
HPLC chromatograms (bottom) and UV spectra (top) of XB-A and rhizosphere extract obtained with a photodiode array detector. (A) Authentic XB-A. (B) Rhizosphere extract of sugar beet seedlings bacterized with Stenotrophomonas sp. strain SB-K88. The eluates were detected at UV 320 nm. The UV spectrum of peak 1 (maximum absorbance at 321 nm) corresponds to the UV spectrum of XB-A. The other two peaks in the chromatogram of the rhizosphere extract were not identified.
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