Showing papers on "Mycovirus published in 1974"

Double-stranded RNA mycovirus in Periconia circinata☆

Abstract: Virus-like particles (VLPs) were isolated from some pathogenic strains of the fungus Periconia circinata , which produces host-specific toxins and causes root rot of susceptible sorghum cultivars. The VLPs were polyhedral, 32 nm in diameter, had a typical nucleo-protein absorption spectrum and sedimented at rates of approximately 66, 140 and 150S. Multiple species of double-stranded ribonucleic acid (dsRNA) with molecular weights of 1·75, 1·40, 1·25, 1·10, 0·48 and 0·42 × 10 6 daltons, estimated by polyacrylamide gel electrophoresis, were isolated from the VLPs and from the fungal mycelium. Some of the non-pathogenic isolates, which did not produce host-specific toxins in culture, also contained the VLPs and dsRNA. In other fungal isolates, both pathogenic and non-pathogenic, VLPs and dsRNA were not detected, suggesting that mycoviruses are not associated with toxin production and pathogenesis in P. circinata .