Aflatoxin B1Production in an Eight-Line Diallel of Zea mays infected with Aspergillus flavus

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Abstract
Wide differences in aflatoxin B1 produced in corn grain were found among 28 possible single crosses from 8 randomly-selected inbred lines used as parents. Ears were artificially inoculated with conidia of A. flavus. In a diallel analysis of the aflatoxin B1 data, highly significant general combining ability (GCA) effects were found but the specific combining ability (SCA) effects were nonsignificant. The levels of aflatoxin B1 observed in corn infected with A. flavus were probably under genetic control. Lower concentrations of aflatoxin B1 in grain were associated with the inbred lines H60 and Mo17 and higher levels with Oh545 in crosses with inbred lines N104, N7B, N28, H84 and Mo5. A cyclic selection program should be effective in developing corn lines with resistance to aflatoxin contamination.