Abstract
Environmentally friendly control measures are needed for suppression of soilborne pathogens of vegetable crops in the Republic of Korea. In vitro challenge assays were used to screen approximately 500 bacterial isolates from 20 Korean greenhouse soils for inhibition of diverse plant pathogens. One isolate, Bacillus subtilis ME488, suppressed the growth of 39 of 42 plant pathogens tested. Isolate ME488 also suppressed the disease caused by Fusarium oxysporum f. sp. cucumerinum on cucumber and Phytophthora capsici on pepper in pot assays. Polymerase chain reaction was used to screen isolate ME488 for genes involved in biosynthesis of 11 antibiotics produced by various isolates of B. subtilis. Amplicons of the expected sizes were detected for bacD and bacAB, ituC and ituD, and mrsA and mrsM involved in the biosynthesis of bacilysin, iturin, and mersacidin, respectively. The identity of these genes was confirmed by DNA sequence analysis of the amplicons. Bacilysin and iturin were detected in culture filtrates from isolate ME488 by gas chromatography coupled with mass spectroscopy and by thin layer chromatography, respectively. Detection of mersacidin in ME488 culture filtrates was not attempted. Experiments reported here indicate that B. subtilis ME488 has potential for biological control of pathogens of cucumber and pepper possibly due to the production of antibiotics.
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Acknowledgements
The authors are grateful to K.-M. Kim, Yeungnam University; K.-C. Park, Gyeongbuk Agricultural Research and Extension Services; and Laurie McKenna, Sustainable Agricultural Systems Laboratory, USDA–ARS. This research was supported in part by the Korean Innovative Technology Fund from the Small and Mid-Size Business Administration to S. Chung (S0050382). A Korean patent was obtained for B. subtilis ME488 (Patent Registration Number: 10-045725-00-00).
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Chung, S., Kong, H., Buyer, J.S. et al. Isolation and partial characterization of Bacillus subtilis ME488 for suppression of soilborne pathogens of cucumber and pepper. Appl Microbiol Biotechnol 80, 115–123 (2008). https://doi.org/10.1007/s00253-008-1520-4
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DOI: https://doi.org/10.1007/s00253-008-1520-4