RNA Virus in Allomyces arbuscula: Ultrastructural Localization During the Life-cycle

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Abstract
Strain Bali 1 of A. arbuscula is infected with a RNA virus; strain North Carolina is not. The virus appears to be avirulent, for strain Bali 1 showed no signs of pathogenicity. Virus aggregates occurred mostly in the cytoplasm during different stages of the gametophytic and sporophytic generations. Small intranuclear aggregates were found only in differentiating gametophytic hyphae and immature gametangia. In motile cells (gametes and zoospores) the aggregates are exclusively contained within the nuclear cap. This represents a reliable mechanism of transmission throughout the life cycle.