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Pseudomonas fluorescens  strain 3JW1, which has a broad-spectrum antimicrobial activity, was studied to investigate whether it affects the amounts of aflatoxin B 1  (AFB 1 ) produced by  Aspergillus flavus . It was found that the bacterium reduced the amounts of AFB 1  in potato dextrose broth (PDB) and peanut medium by 97.8% and 99.4%, respectively. It also reduced AFB 1  by ~183 μg/kg (55.8%) when applied onto peanut kernels. This strain reduced AFB 1  via three mechanisms. First, it significantly inhibited  A .  flavus  growth; second, our data showed that strain 3JW1 inhibits aflatoxin biosynthesis by  A .  flavus ; and third,  P .  fluorescens  strain 3JW1 is capable of degrading AFB 1  at a rate as high as 88.3% in 96 hours. This is the first report demonstrating that  Pseudomonas fluorescens  can reduce toxin contamination caused by  A .  flavus  on peanut kernels. Our findings indicate that  P .  fluorescens  strain 3JW1 had multiple effects including reducing  A .  flavus  infection and aflatoxin contamination. And the results also highlight the potential applications of the strain 3JW1 for the biological control of aflatoxin contamination in peanuts and other susceptible crops.

Investigation of Pseudomonas fluorescens strain 3JW1 on preventing and reducing aflatoxin contaminations in peanuts