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Relacion entre las concentraciones de hierro, cobre y zinc y la incidencia. de aspergillus flavus, fusarium moniliforme, aflatoxinas y fumonisinas en maiz



Relacion entre las concentraciones de hierro, cobre y zinc y la incidencia. de aspergillus flavus, fusarium moniliforme, aflatoxinas y fumonisinas en maiz



Fitopatologia Venezolana 18(1): 15-19



The iron (Fe), copper (Cu) and zinc (Zn) concentrations were analyzed in soil and maize from three locations of Venezuela to determine its relation with aflatoyin and fumonisins. Aspergillus flavus and Fusarium moniliforme populations was determined by plate count in the DRBC medium. Mycotoxins were quantified by specific immunoassays. Fe, Cu and Zn concentrations were estimated by atomic absortion spectroscopy with flame. A. flavus populations in soil and maize not showed differences among locations, neither between soil sampling time. Greater A. flavus population was found at Sta. Cruz de Turen. Significant differences among locations, soil sampling time and in the interaction locations x soil sampling time were found for F. moniliforme populations in soil and non significant differences were found in maize. Greater F. mondiforme population was found at Sabana de Parra. The Fe showed the greater concentrations in the three locations while the Cu was the lowest. Fe, Cu and Zn concentrations in the soil showed significant differences among locations while Cu and Zn in maize. Samples from Sta. Cruz de Turen showed the greater frequency and incidence of aflatoxins and fumonisins. Positive correlation between aflatoxins and Fe in the soil was found at Sta. Cruz de Turen and Sabana de Parra. Also the Cu was correlated with aflatoxins at Sta. Cruz de Turen. Positive significant correlation between fumonisins and Fe, Cu and Zn concentrations in soil and maize kernels was found, Additional key words: metals, mycotoxins, Zea mays.

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