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Fusarium wilt caused by  Fusarium oxysporum  f. sp.  momordicae  ( FoM ) is an important fungal disease that affects the production of bitter gourd. Hypovirulence-associated mycoviruses have great potential and application prospects for controlling the fungal disease. In this study, a novel ourmia-like virus, named  Fusarium oxysporum  ourmia-like virus 1 (FoOuLV1), was isolated from  FoM  strain HuN8. The viral genomic RNA is 2,712 nucleotides (nt) in length and contains an open reading frame (ORF) encoding a putative RNA-dependent RNA polymerase (RdRp) using either standard or mitochondrial codes. In strain HuN8, there was also a FoOuLV1-associated RNA segment with 1,173 nt in length with no sequence homology. Phylogenetic analysis showed that FoOuLV1 is a member of the genus  Magoulivirus  of the family  Botourmiaviridae . FoOuLV1 was found to be associated with hypovirulence in  FoM . Moreover, FoOuLV1 and its hypovirulence trait can be transmitted horizontally to other  FoM  strains and also to other formae speciale strains of  F. oxysporum . In addition, FoOuLV1 showed significant biological control effect against the bitter gourd Fusarium wilt. To our knowledge, this study reveals the first description of a hypovirulence-associated ourmia-like mycovirus, which has the potential to the biological control of Fusarium wilt.

A Novel Ourmia-Like Mycovirus Confers Hypovirulence-Associated Traits on Fusarium oxysporum