XVI International Botanical Congess

Nonaflatoxigenic white-spored mutants of Aspergillus parasiticus were paired in different proportions on an agar medium with aflatoxigenic yellow-spored mutants belonging to the same isolate, to the same vegetative compatibility group but with the original wild types differing in phenotype, and to different vegetative compatibility groups. Heterokaryosis as a result of hyphal anastomosis was detected by the presence of heads with a mixture of green and parental (white and/or yellow) spore chains. There were no consistent differences in aflatoxin B1 inhibition by nonaflatoxigenic strains between pairings from the same vegetative compatibility group and pairings from different groups.