In vitrointeraction of actinomycetes isolates withAspergillus flavus: impact on aflatoxins B1 and B2 production

Abstract : This work aimed to study the interaction between Actinomycetal isolates and Aspergillus flavus to promote mutual antagonism in contact. Thirty‐seven soilborn Streptomyces spp. isolates were chosen as potential candidates. After a 10‐day in vitro co‐incubation period, 27 isolates respond to the criteria, that is, mutual antagonism in contact. Further aflatoxins B1 and B2 analysis revealed that those 27 isolates reduced aflatoxin B1 residual concentration from 38·6 to 4·4%, depending on the isolate. We selected 12 isolates and tested their capacity to reduce AFB1 in pure culture to start identifying the mechanisms involved in its reduction. AFB1 was reduced by eight isolates. The remaining AFB1 concentration varied between 82·2 and 15·6%. These findings led us to suggest that these eight isolates could be used as biocontrol agents against AFB1 and B2 with low risk of impacting the natural microbial equilibrium.
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Carol Verheecke, Thierry Liboz, Marion Darriet, Nasserdine Sabaou, Florence Mathieu. In vitrointeraction of actinomycetes isolates withAspergillus flavus: impact on aflatoxins B1 and B2 production. Letters in Applied Microbiology, Wiley, 2014, 58 (6), pp.597-603. ⟨10.1111/lam.12233⟩. ⟨hal-01888666⟩

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