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Fusarium species of the Gibberella fujikuroi complex and fumonisin contamination of pearl millet and corn in Georgia, USA

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Abstract

This study was designed to identify and compare the Fusarium species of the Gibberella fujikuroi complex on pearl millet (Pennisetum glaucum (L.) R. Br) and corn (Zea mays L.) crops grown in southern Georgia, and to determine their influence on potential fumonisin production. Pearl millet and corn samples were collected in Georgia in 1996, 1997 and 1998. Three percent of the pearl millet seeds had fungi similar to the Fusarium species of the G. fujikuroi species complex. One hundred and nineteen representative isolates visually similar to the G. fujikuroi species complex from pearl millet were paired with mating population A (Fusarium verticillioides (Sacc.) Nirenberg), mating population D (F. proliferatum (Matsushima) Nirenberg) and mating population F (F. thapsinum (Klittich, Leslie, Nelson and Marasas) tester strains. Successful crosses were obtained with 50.4%, 10.1% and 0.0% of these isolates with the A, D and F tester strains, while 39.5 of the isolates did not form perithecia with any tester strains. Two of the typical infertile isolates were characterized by DNA sequence comparisons and were identified as Fusarium pseudonygamai (Nirenberg and O’Donnell), which is the first known isolation of this species in the United States. Based on the pattern of cross-compatibility, conidiogenesis, colony characteristics and media pigmentation, a majority of the infertile isolates belong to this species. Fumonisins FB 1 and FB 2 were not detected in any of the 81 pearl millet samples analyzed. The species of the G. fujikuroi species complex were dominant in corn and were isolated from 84%, 74% and 65% of the seed in 1996, 1997 and 1998, respectively. Representative species of the G. fujikuroi species complex were isolated from 1996 to 1998 Georgia corn survey (162, 104 and 111 isolates, respectively) and tested for mating compatibility. The incidence of isolates belonging to mating population A (F. verticillioides) ranged from 70.2% to 89.5%. Corn survey samples were assayed for fumonisins, and 63% to 91% of the 1996, 1997 and 1998 samples were contaminated. The total amount of fumonisins in the corn samples ranged from 0.6 to 33.3 μg/g.

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Authors and Affiliations

  1. University of Georgia, Tifton, GA

    Z. Jurjevic, D. M. Wilson, W. Mubatanhema & G. C. Rains

  2. USDA-ARS, Tifton, GA

    J. P. Wilson, D. M. Geiser & N. W. Widstrom

  3. The Pennsylvania State University, University Park, PA, USA

    J. H. Juba

  4. Department of Plant Pathology, P.O. Box 748, Tifton, GA, 31793, USA

    D. M. Wilson

Authors
  1. Z. Jurjevic
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  2. D. M. Wilson
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  3. J. P. Wilson
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  4. D. M. Geiser
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  5. J. H. Juba
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  6. W. Mubatanhema
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  7. N. W. Widstrom
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  8. G. C. Rains
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Correspondence to D. M. Wilson.

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Jurjevic, Z., Wilson, D.M., Wilson, J.P. et al. Fusarium species of the Gibberella fujikuroi complex and fumonisin contamination of pearl millet and corn in Georgia, USA. Mycopathologia 159, 401–406 (2005). https://doi.org/10.1007/s11046-004-1050-2

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  • DOI: https://doi.org/10.1007/s11046-004-1050-2

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