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Abstract
The genetic diversity of Aspergillus flavus populations isolated from the peanut-cropped soils in the peanut-growing region at Cordoba Province was evaluated by analysis of vegetative compatibility group (VCG). VCG s were determined through complementation assays between nitrate-nonutilizing (NNO) mutants. Fifty-six VCG s were identified from 100 isolates. Twenty-five VCG s contained two or more isolates and 31 VCG s contained only a single isolate. In general, there were significant differences among VCG s in aflatoxin and CPA production. One VCG group included a single atoxigenic strain since it was neither aflatoxin nor cyclopiazonic acid producer. This isolate could be useful as a biological control agent, since it was unable to form a stable heterokaryon in the complementation test with the other isolates. Seven A. flavus isolated from soil were atypical because they simultaneously produced aflatoxins B, G and CPA.
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