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Actin assembly at the hyphal tip is key for polar growth and pathogenesis of the rice blast fungus  Magnaporthe oryzae . The mechanism of its precise assemblies and biological functions is not understood. Here, we characterized the role of  M. oryzae  Twinfilin (MoTwf) in  M .  oryzae  infection through organizing the actin cables that connect to Spitzenkörper (Spk) at the hyphal tip. MoTwf could bind and bundle the actin filaments. It formed a complex with Myosin2 (MoMyo2) and the Woronin body protein Hexagonal peroxisome 1 (MoHex1). Enrichment of MoMyo2 and MoHex1 in the hyphal apical region was disrupted in a Δ Motwf  loss‐of‐function mutant, which also showed a decrease in the number and width of actin cables. These findings indicate that MoTwf participates in the virulence of  M. oryzae  by organizing Spk‐connected actin filaments and regulating MoHex1 distribution at the hyphal tip.

Twinfilin regulates actin assembly and Hexagonal peroxisome 1 (Hex1) localization in the pathogenesis of rice blast fungus Magnaporthe oryzae