Aflatoxin accumulation in maize after inoculation with Aspergillus flavus and infestation with southwestern corn borer
2003
Williams, W.P. | Windham, G.L. | Buckley, P.M.
Aflatoxin is a potent carcinogen produced by the fungus Aspgergillus flavus Link: Fr. Drought, high temperatures, and insect damage are associated with high levels of aflatoxin accumulation in maize, Zea mays L. Plant resistance is generally considered a desirable way of reducing aflatoxin contamination. Germplasm lines with resistance to aflatoxin contamination have been developed. A nine-parent diallel cross was made using three lines with resistance to southwestern corn borer, Diatraea grandiosella Dyar: three lines with resistance to aflatoxin contamination; and three lines susceptible to both aflatoxin contamination and southwestern corn borer. The resulting single cross hybrids were evaluated for aflatoxin contamination following inoculation with A. flavus and infestation with southwestern corn borer. General combining ability (GCA) was a highly significant source of variation in the inheritance of resistance to aflatoxin contamination; specific combining ability was not significant. Estimates of GCA effects indicated that Mp313E and Mp92:673, lines selected for aflatoxin resistance, contributed significantly to reduced aflatoxin contamination. Hybrids with Mp496 and Mp716, two of the southwestern corn borer resistant lines, also exhibited levels of aflatoxin contamination. These lines would be useful as sources of resistance in the development of maize hybrids with resistance to aflatoxin contamination.
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