4.7 Article

Abiotic conditions leading to FUM gene expression and fumonisin accumulation by Fusarium proliferatum strains grown on a wheat-based substrate

Journal

INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY
Volume 253, Issue -, Pages 12-19

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijfoodmicro.2017.04.017

Keywords

Fumonisin; Fusarium proliferatum; Wheat; FUM gene; Gene expression; Abiotic stress

Funding

  1. BECAR
  2. ANPCyT Agencia Nacional de Promotion Cientifica y Tecnologica [PICT-2012-1436]

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Fusarium proliferation produces fumonisins B not only on maize hilt also on diverse crops including wheat. Using a wheat-based medium, the effects of abiotic factors, temperature and water activity (a(w)), on growth, fumonisin biosynthesis, and expression of FUM genes were compared for three F. proliferatum strains isolated from durum wheat in Argentina. Although all isolates showed similar profiles of growth, the fumonisin production profiles were slightly different. Regarding FUM gene transcriptional control, both FUM8 and FUM19 expression showed similar behavior in all tested conditions. For both genes, expression at 25 degrees C correlated with fumonisin production, regardless of the a(w) conditions. However, at 15 degrees C, these two genes were as highly expressed as at 25 degrees C although the amounts of toxin were very weak, suggesting that the kinetics of fumonisin production was slowed at 15 degrees C. This study provides useful baseline data on conditions representing a low or a high risk for contamination of wheat kernels with fumonisins.

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