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Effect of water activity and temperature on growth and trichothecene production by Fusarium meridionale

A I Rybecky1, S N Chulze1, M L Chiotta1

  • 1Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Río Cuarto, Córdoba, Argentina.

International Journal of Food Microbiology
|July 30, 2018
PubMed

Insights

Fusarium meridionale growth and mycotoxin production, including deoxynivalenol (DON) and nivalenol (NIV), are influenced by temperature and water activity. Optimal conditions for soybean contamination align with pre-harvest stages, necessitating control strategies.

Area of Science:

  • Agricultural Science
  • Mycology
  • Plant Pathology

Background:

  • Fusarium meridionale is a significant soybean pathogen in Argentina, comparable in pathogenicity to F. graminearum.
  • Limited data exists on F. meridionale's growth and mycotoxin production under varying environmental conditions.

Purpose of the Study:

  • To investigate the impact of temperature, water activity (aW), and fungal strain on F. meridionale growth.
  • To assess the production of deoxynivalenol (DON) and nivalenol (NIV) by F. meridionale in a soybean-based medium.

Main Methods:

  • Controlled laboratory experiments were conducted to assess fungal growth.
  • Mycotoxin analysis was performed using a soybean-based culture medium.

Main Results:

  • Optimal growth for F. meridionale occurred at 25°C and 0.98-0.99 aW.
  • Deoxynivalenol (DON) production peaked at 25°C and 0.96 aW.
  • Nivalenol (NIV) production varied by strain, with optimal temperatures of 30°C (B2300) and 20°C (F5043, 5048) at 0.98 aW.

Conclusions:

  • Environmental conditions favoring F. meridionale growth and mycotoxin production (DON, NIV) are prevalent during the soybean pre-harvest stage.
  • Developing targeted control strategies is crucial to mitigate DON and NIV contamination in harvested soybean grains.
Keywords:
DeoxynivalenolEco-physiological conditionsFusarium meridionaleNivalenolSoybean based medium

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