Rye and wheat grain was infected with Aspergillus flavus spores. The dynamics of B1 aflatoxin and spore formation was studied. The synthesis of B1 aflatoxin in the mold-affected grain started simultaneously with the emergence of fungal spores; its further accumulation in the grain correlated with an increase in the spore number till the stage of maximum spore formation. The highest level of aflatoxin synthesis was inversely proportional to the number of Aspergillus flavus spores which infected the grain before its molding.
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