Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 69, Issue 19, Pages 5471-5480Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.1c01162
Keywords
Serratia plymuthica; serratamid; antibacterial activity; tomato bacterial wilt; fire blight
Funding
- Cooperative Research Program for Agricultural Science and Technology Development [PJ015296042021]
- Rural Development Administration, Republic of Korea
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A new hybrid non-ribosomal peptide-polyketide antibiotic, serratamid, isolated from soil bacterium Serratia plymuthica C1, showed strong antibacterial activity against phytopathogenic bacteria, particularly Ralstonia solanacearum and Xanthomonas spp., and effectively reduced bacterial wilt and fire blight in plant experiments.
A new hybrid non-ribosomal peptide-polyketide antibiotic (serratamid) for phytoprotection was isolated from the ethyl acetate layer of tryptic soy agar culture of the soil bacterium Serratia plymuthica C1 through bioassay-guided fractionation. Its chemical structure was elucidated using instrumental analyses, such as mass and nuclear magnetic resonance spectrometry. Serratamid showed antibacterial activity against 15 phytopathogenic bacteria, with minimum inhibitory concentration (MIC) values ranging from 0.244 to 31.25 mu g/mL. In vitro, it displayed strong antibacterial activity against Ralstonia solanacearum and four Xanthomonas spp., with MIC values (0.244-0.488 mu g/mL) superior to those of streptomycin sulfate, oxolinic acid, and oxytetracycline. Further, serratamid and the ethyl acetate layer of S. plymuthica C1 effectively reduced bacterial wilt caused by R. solanacearum on tomato seedlings and fire blight caused by Erwinia on apple fruits in a dose-dependent manner. These results suggest that serratamid is a promising candidate as a potent bactericide for controlling bacterial diseases.
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