Phytopathology (2018) 108, 957-963

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Carlos Germán Lemus-Minor, M. Carmen Cañizares, María Dolores García-Pedrajas and Encarnación Pérez-Artés (2018)
Fusarium oxysporum f. sp. dianthi virus 1 accumulation is correlated with changes in virulence and other phenotypic traits of its fungal host
Phytopathology 108 (8), 957-963
Abstract: Fusarium oxysporum f. sp. dianthi virus 1 (FodV1) was detected in isolate 116 (116V+) of Fusarium oxysporum f. sp. dianthi, reaching such a high accumulation level that it was clearly visible after agarose gel electrophoresis of total DNA extracts. FodV1 consists of four double-stranded RNA segments that correspond to a new mycovirus in the Chrysoviridae family. We obtained an isolate of F. oxysporum f. sp. dianthi 116 (116V-) with only a residual level of FodV1 RNA accumulation by single-conidia selection. Compared with 116V-, isolate 116V+ showed significant phenotypic alterations in vegetative growth and virulence. Thus, the presence of a high titer of mycovirus FodV1 was associated with a modified morphology and a reduced growth of the colonies on solid medium, and with a diminished conidiation in liquid medium. Inoculation of four susceptible carnation cultivars with either 116V- or 116V+ showed that the presence of a high titer of FodV1 was also correlated with a significantly reduced virulence of its fungal host. All of the results suggest that FodV1 could be associated with hypovirulence, identifying it as a potential biocontrol agent for Fusarium wilt of carnation. This is the first report of a mycovirus potentially associated with the induction of hypovirulence in the species F. oxysporum.
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Link to article at publishers website
Database assignments for author(s): Encarnación Pérez-Artés

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Fusarium oxysporum f.sp. dianthi
Fusarium mycoviruses (antagonists) Fusarium oxysporum f.sp. dianthi