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Fusarium head blight caused by  Fusarium graminearum  is an important disease of wheat and barley worldwide. In a previous study on functional characterization of the  F. graminearum  kinome, one protein kinase gene important for virulence is orthologous to  SCH9  that is functionally related to the cAMP-PKA and TOR pathways in the budding yeast. In this study, we further characterized the functions of  FgSCH9  in  F. graminearum  and its ortholog in  Magnaporthe oryzae . The Δ Fgsch9  mutant was slightly reduced in growth rate but significantly reduced in conidiation, DON production, and virulence on wheat heads and corn silks. It had increased tolerance to elevated temperatures but became hypersensitive to oxidative, hyperosmotic, cell wall, and membrane stresses. The Δ Fgsch9  deletion also had conidium morphology defects and produced smaller conidia. These results suggest that  FgSCH9  is important for stress responses, DON production, conidiogenesis, and pathogenesis in  F. graminearum . In the rice blast fungus  Magnaporthe oryzae , the Δ Mosch9  mutant also was defective in conidiogenesis and pathogenesis. Interestingly, it also produced smaller conidia and appressoria. Taken together, our data indicate that the  SCH9  kinase gene may have a conserved role in regulating conidium size and plant infection in phytopathogenic ascomycetes.

The Sch9 Kinase Regulates Conidium Size, Stress Responses, and Pathogenesis in Fusarium graminearum