Author:

CM Bucio-Villalobos, D Guzmán-de-Peña & JJ Peña-Cabriales

Date: 4 April 2004

Abstract:

Aflatoxin contamination of corn is an important problem internationally, particularlyin tropical and subtropical conditions that favor infection and synthesis byAspergillus. Environmental conditions (drought) and agronomic practices i.e.N fertilization have been reported as favorable to aflatoxin synthesis in the field.This study was undertaken to investigate whether the contamination of corncommonly observed in stored conditions in this important corn producing regionof Mexico known as “El Bajà­o” is related to infection by Aspergillus under fieldconditions. Results using three corn hybrids of recognized susceptibility to infectionshowed that corn ears artificially inoculated in the field with a toxigenic strainof Aspergillus parasiticus presented a low content of aflatoxin ranging from 13.6to 24.7 µg Kg-1. No significant differences were observed between the hybridstested. Similarly, N fertilization practices, 260 Kg N ha-1, applied at sowing did nothave an effect on the extent of the contamination observed of 6.2 and 19.3 mg ofaflatoxin kg-1 in natural infected and inoculated samples with A. parasiticus NRRL2999, respectively. Our data suggest that the cases of aflatoxin contamination ofcorn in this part of Mexico are not related to infection occurring during the cropsgrowing period but most probably to poor storage conditions of corn.

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