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A New Double-stranded RNA Virus from Gaeumannomyces graminis

Department of Pure and Applied Biology, Imperial College of Science and Technology, London SW7 2BB, U.K.

An isometric virus, obtained from an isolate of Gaeumannomyces graminis, had the following properties: diameter 29 nm; sedimentation coefficient 127S; buoyant density in CsCl 1.40 g/ml; one double-stranded RNA component of 1.80 kilobase pairs; one capsid polypeptide species of mol. wt. 66000; A₂₆₀/A₂₈₀ 1.7. The virus was unrelated serologically to three other viruses present in the same fungal isolate and to 12 previously described viruses belonging to G. graminis virus groups I, II and III. On the basis of its distinctive properties the virus is assigned to a new G. graminis virus group IV.

Keywords: mycovirus, RNA, double-stranded, Gaeumannomyces graminis, serology

Received 16 November 1983; accepted 14 February 1984.