p18 encoded by FgGMTV1 is responsible for asymptomatic infection in <i>Fusarium graminearum</i>

Mycovirus-fungus interplay often leads to asymptomatic infections. Our study identifies p18, a novel protein from the genomovirus FgGMTV1, as a key determinant of asymptomatic infection in <i>Fusarium graminearum</i>. A p18-null mutant exhibits a pronounced hypovirulent phenotype. By modulating viral accumulation, p18 promotes asymptomatic infection and facilitates vertical transmission via conidia. This insight deepens our understanding of mycovirus-fungus interactions and introduces a novel strategy for biocontrol using engineered mycoviruses.