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The effect of natural phenolic acids was tested on the growth and production of T-2 and HT-2 toxins by  Fusarium langsethiae  and  F. sporotrichioides , on Mycotoxin Synthetic medium. Plates treated with 0.5 mM of each phenolic acid (caffeic, chlorogenic, ferulic and  p -coumaric) and controls without phenolic acid were incubated for 14 days at 25 °C. Fungal biomass of  F. langsethiae  and  F. sporotrichioides  was not reduced by the phenolic acids. However, biosynthesis of T-2 toxin by  F. langsethiae  was significantly reduced by chlorogenic (23.1%) and ferulic (26.5%) acids. Production of T-2 by  F. sporotrichioides  also decreased with ferulic acid by 23% ( p  < 0.05). In contrast,  p -coumaric acid significantly stimulated the production of T-2 and HT-2 toxins for both strains. A kinetic study of  F. langsethiae  with 1 mM ferulic acid showed a significant decrease in fungal biomass, whereas T-2 production increased after 10 days of incubation. The study of gene expression in ferulic supplemented cultures of  F. langsethiae  revealed a significant inhibition for  Tri5 ,  Tri6  and  Tri12  genes, while for  Tri16  the decrease in gene expression was not statistically significant. Overall, results indicated that phenolic acids had a variable effect on fungal growth and mycotoxin production, depending on the strain and the concentration and type of phenolic acid assayed.

Effects of Phenolic Acids on the Growth and Production of T‐2 and HT‐2 Toxins by Fusarium langsethiae and F. sporotrichioides