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Acta Microbiol Immunol Hung. 2014 Jun;61(2):189-208. doi: 10.1556/AMicr.61.2014.2.9.

Toxicity of abiotic stressors to Fusarium species: differences in hydrogen peroxide and fungicide tolerance.

Author information

  • 1Hungarian Academy of Sciences Plant Protection Institute, Centre for Agricultural Research H-1525 Budapest P.O. Box 102 Hungary.
  • 2University of Debrecen Department of Microbial Biotechnology and Cell Biology, Faculty of Sciences H-4032 Debrecen Egyetem tér 1 Hungary.
  • 3Szent István University Mycology Group of the Hungarian Academy of Sciences, Institute of Plant Protection H-2103 Gödöllő Páter K. u. 1 Hungary.

Abstract

Stress sensitivity of three related phytopathogenic Fusarium species (Fusarium graminearum, Fusarium oxysporum and Fusarium verticillioides) to different oxidative, osmotic, cell wall, membrane, fungicide stressors and an antifungal protein (PAF) were studied in vitro. The most prominent and significant differences were found in oxidative stress tolerance: all the three F. graminearum strains showed much higher sensitivity to hydrogen peroxide and, to a lesser extent, to menadione than the other two species. High sensitivity of F. verticillioides strains was also detectable to an azole drug, Ketoconazole. Surprisingly, no or limited differences were observed in response to other oxidative, osmotic and cell wall stressors. These results indicate that fungal oxidative stress response and especially the response to hydrogen peroxide (this compound is involved in a wide range of plant-fungus interactions) might be modified on niche-specific manner in these phylogenetically related Fusarium species depending on their pathogenic strategy. Supporting the increased hydrogen peroxide sensitivity of F. graminearum, genome-wide analysis of stress signal transduction pathways revealed the absence one CatC-type catalase gene in F. graminearum in comparison to the other two species.

KEYWORDS:

Fusarium; Ketoconazole; abiotic stress tolerance; catalase; hydrogen peroxide; niche-specific adaptation; oxidative stress

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