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Host-specific Variation in Infection by Toxigenic Fungi and Contamination by Mycotoxins in Pearl Millet and Corn

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Abstract

Pearl millet is widely consumed in regions of Africa and Asia, and is increasingly being grown as an alternative grain in drought-prone regions of the United States. Pearl millet and corn were grown in dryland conditions at Tifton, Georgia, USA and grains were compared for pre-harvest infection by potentially toxigenic fungi and contamination by mycotoxins. Corn hybrids Agripro 9909 and Pioneer 3146, and pearl millet Tifgrain 102 were grown in 2000 and 2001; pearl millet HGM 100 was included in the test in 2001. Hybrids were sown on multiple planting dates in each year to induce variation in flowering time. Host species differed in the frequency of isolation of potentially toxigenic fungal species in both years. Across years, corn hybrids were more prone to infection by Aspergillus flavus Link (maximum isolation frequency = 8.8%) and Fusarium moniliforme Sheldon sensu lato (maximum isolation frequency = 72.8%), with corresponding greater concentrations of aflatoxins (maximum concentration = 204.9 μg kg−1) and fumonisins (maximum concentration = 34,039 μg kg−1). Pearl millet was more prone to infection by F. semitectum Berk. & Ravenel (maximum isolation = 74.2%) and F. chlamydosporum Wollenweb & Reinking (maximum isolation = 33.0%), and contamination by moniliformin (maximum contamination = 92.1 μg kg−1). Beauvericin (maximum concentration = 414.6 μg kg−1) was present in both hosts. Planting date of corn affected aflatoxin and beauvericin contamination in 2000, and fumonisin concentration in 2001. The observed differences in mycotoxin contamination of the grains, which are likely due to host-specific differences in susceptibility to pre-harvest mycoflora, may affect food safety when the crops are grown under stress conditions.

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Authors and Affiliations

  1. Crop Genetics & Breeding Research Unit, United States Department of Agriculture - Agricultural Research Service, Tifton, GA, USA

    J. P. Wilson

  2. Department of Plant Pathology, University of Georgia, Tifton, GA, USA

    Z. Jurjevic & D. M. Wilson

  3. Department of Crop & Soil Sciences, University of Georgia, Tifton, GA, USA

    W. W. Hanna & A. E. Coy

  4. Southeast Watershed Research Laboratory, United States Department of Agriculture - Agricultural Research Service, Tifton, GA, USA

    T. L. Potter

  5. USDA-ARS Crop Genetics & Breeding Research Unit, P.O. Box 748, Tifton, GA, 31793-0748, USA

    J. P. Wilson

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  1. J. P. Wilson
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  2. Z. Jurjevic
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  3. W. W. Hanna
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  4. D. M. Wilson
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Correspondence to J. P. Wilson.

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Wilson, J.P., Jurjevic, Z., Hanna, W.W. et al. Host-specific Variation in Infection by Toxigenic Fungi and Contamination by Mycotoxins in Pearl Millet and Corn. Mycopathologia 161, 101–107 (2006). https://doi.org/10.1007/s11046-005-0170-7

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  • DOI: https://doi.org/10.1007/s11046-005-0170-7

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