the percentage rate of rot of peanut kernels was 31.67%±2.89%, which was markedly lowerthan that treated with water (the control) after 7 days of incubation at 28 °C. The results also showed thatunwashed cell culture of B. megaterium was as effective as the washed cell suspension, and better biocontrolwas obtained when longer incubation time of B. megaterium was applied. When the incubation time ofB. megaterium was 60-h, the rate of decay declined to 41.67%±2.89%. Furthermore, relative to the expressionof 18S rRNA, the mRNA abundances of aflR gene and aflS gene in the experiment group were 0.28±0.03 and0.024±0.005 respectively, indicating that this strain of B. megaterium could significantly reduce thebiosynthesis of aflatoxins and expression of aflR gene and aflS gene (p<0.01). To the best of our knowledge,this is a first report demonstrating that the marine bacterium B. megaterium could be used as a biocontrolagent against postharvest fungal disease caused by A. flavus.
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