Authors:Emese Nagygyörgy, Barbara Kovács, Éva Leiter, Márton Miskei, István Pócsi, László Hornok and Attila Ádám
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.
Authors:Vivian J. Szilagyi-Zecchin, Douglas Adamoski, Renata Rodrigues Gomes, Mariangela Hungria, Angela C. Ikeda, Vanessa Kava-Cordeiro, Chirlei Glienke and Lygia V. Galli-Terasawa
contribute to mycotoxins accumulation  . Plants may develop typical disease symptoms only when they go through biotic and abioticstress situations  . In this same context, Chaetomium globosum is known as endophyte, saprophytic, or pathogen [43