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Fusarium graminearum toxins in field corn 1. time course of fungal growth and production of deoxy nivalenol and other myco toxins/



Fusarium graminearum toxins in field corn 1. time course of fungal growth and production of deoxy nivalenol and other myco toxins/



Canadian Journal of Botany 61(12): 3080-3087



The formation of the trichothecene mycotoxins deoxynivalenol and 15-acetyldeoxynivalenol and zearalenone in field corn inoculated with F. graminearum was studied over a growing season. The mycotoxins, ergosterol, colony forming units, weight, moisture and ash contents were measured in the infected ears. Measurements of toxins and ergosterol in infected plants, weather data, and analyses of the soil mycoflora were also taken. In the infected ears, fungal propagule counts rapidly increased up to 6 wk after inoculation and then sharply declined. Ergosterol concentrations followed the propagule data for the 1st 6 weeks and then leveled off (at .apprx. 70 ppm). Deoxynivalenol concentrations increased (to .apprx. 580 ppm), over the same period and then declined (to .apprx. 430 ppm); 15-acetyldeoxynivalenol concentrations rose rapidly in the 1st 2 wk (to 64 ppm) and then slowly declined (to 20 ppm); an appreciable amount of zearalenone (10 ppm) was not observed until 9 wk after inoculation. The data indicated that the relative and absolute concentrations of the 2 trichothecenes present in the corn may have been affected by the plant, and toxins were found throughout the plant but mainly in the infected part.

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Accession: 005499282

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