A Brevibacillus sp. antagonistic to mycotoxigenic Fusarium spp
2015
Joo, Hae Jin | Kim, Hwang-Yong | Kim, Lee-Han | Lee, Soohyung | Ryu, Jae-Gee | Lee, Theresa
Antagonistic microbes were isolated from soils to control mycotoxin contamination of cereals by limiting the growth of mycotoxigenic Fusarium species. In total, 341 bacterial isolates were examined for antifungal activity against eight mycotoxigenic Fusarium species using dual culture assays. The screening identified 11 isolates that inhibited mycelial growth of all Fusarium species tested. The culture filtrates of 2 of the 11 isolates completely inhibited germination of conidia up to 21days of incubation. These two isolates exhibited identical activity toward the fungi tested and were identified as Brevibacillus spp. based on 16S rRNA sequence homology. The most closely related species based on phylogenetic analysis was Brevibacillus reuszeri. Additional dual culturing using further fungal species showed that the antagonistic Brevibacillus inhibited the growth of most Fusarium species tested (39 of 46 species), two Epicoccum spp., one Alternaria sp., three Aspergillus spp. (3 of 11), and three Penicillium spp. (3 of 8). The in vivo assay was performed to test the efficacy of antagonistic Brevibacillus isolates on maize ears and revealed that the application of microbes suppressed ear rot (ANOVA, p=0.0020). This Brevibacillus sp. may be an antagonist of the majority of Fusarium species, including mycotoxigenic species.
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