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Production of T-2 toxin by aFusarium resemblingFusarium poae

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Abstract

AFusarium species with a micro morphology similar toF. poae and a metabolite profile resembling that ofF. sporotrichioides has been identified. Like typicalF. 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 fromF. poae. The lack of macroconidia, polyphialides and chlamydospores differentiates it fromF. 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 typicalF. poae isolates studied. The question of whether thisFusarium should be classified asF. poae orF. sporotrichioides or a separate taxon should be addressed.

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Authors and Affiliations

  1. Dep. Food and Feed Hygiene, National Veterinary Institute, P. O. Box 8156 Dep, N-0033, Oslo, Norway

    Mona Torp & Wenche Langseth

Authors
  1. Mona Torp

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  2. Wenche Langseth

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