Production of T-2 toxin by a Fusarium resembling Fusarium poae |
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Authors: | Torp Mona Langseth Wenche |
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Institution: | (1) Dep. Food and Feed Hygiene, National Veterinary Institute, P. O. Box 8156 Dep, N-0033 Oslo, Norway |
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Abstract: | A Fusarium species with a micro morphology similar to F. poae and a metabolite profile resembling that of F. sporotrichioides has been identified. Like typical F. poae, the microconidia have a globose to pyriform shape, but the powdery appearance, especially on Czapek-Dox Iprodione Dichloran
agar (CZID), less aerial mycelium and the lack of fruity odour on Potato Sucrose Agar (PSA) make it different from F. poae. The lack of macroconidia, polyphialides and chlamydospores differentiates it from F. sporotrichioides. All 18 isolates investigated, 15 Norwegian, two Austrian and one Dutch, produced T-2 toxin (25–400 μg/g) on PSA or Yeast
Extract Sucrose agar (YES). In addition, neosolaniol, iso-neosolaniol, HT-2 toxin, 4- and 15-acetyl T-2 tetraol, T-2 triol
and T-2 tetraol and4,15-diacetoxyscirpenol were formed in variable amounts. Neither nivalenol, 4- or 15-acetylnivalenolor
4,15-diacetylnivalenol were detected in any of the cultures, while these toxins were produced at least in small amounts by
all the 12 typical F. poae isolates studied. The question of whether this Fusarium should be classified as F. poae or F. sporotrichioides or a separate taxon should be addressed.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | Mycotoxins Norwegian isolates grains morphology metabolite profile |
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