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- W2096611164 abstract "A soil bacterium, designated strain no. 27, was found to produce aflatoxin-production inhibitors. The strain was identified as a species of the genus Stenotrophomonas, and was found to be closely related to Stenotrophomonas rhizophila. Two diketopiperazines, cyclo(l-Ala–l-Pro) and cyclo(l-Val–l-Pro), were isolated from the bacterial culture filtrate as main active components. These compounds inhibited aflatoxin production of Aspergillus parasiticus and Aspergillus flavus in liquid medium at concentrations of several hundred µM without affecting fungal growth. Both inhibitors inhibited production of norsorolinic acid, a biosynthetic intermediate involved in an early step of the aflatoxin biosynthetic pathway, and reduced the mRNA level of aflR, which is a gene encoding a key regulatory protein necessary for the expression of aflatoxin-biosynthetic enzymes. These results indicated that the inhibitors targets are present in early regulatory steps leading to AflR expression. Co-culture of strain no. 27 with aflatoxigenic fungi in liquid medium effectively suppressed aflatoxin production of the fungus without affecting fungal growth. Furthermore, application of the bacterial cells to peanuts in laboratory experiments and at a farmer’s warehouse in Thailand by dipping peanuts in the bacterial cell suspension strongly inhibited aflatoxin accumulation. The inhibitory effect was dependent on bacterial cell numbers. These results indicated that strain no. 27 may be a practically effective biocontrol agent for aflatoxin control." @default.
- W2096611164 created "2016-06-24" @default.
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- W2096611164 date "2013-05-01" @default.
- W2096611164 modified "2023-10-01" @default.
- W2096611164 title "Prevention of aflatoxin contamination by a soil bacterium of Stenotrophomonas sp. that produces aflatoxin production inhibitors" @default.
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- W2096611164 doi "https://doi.org/10.1099/mic.0.065813-0" @default.
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