ABSTRACT
The Dianthoviruses form the most recently established group of plant viruses. Carnation ringspot virus is the type member from which the group name is derived, Dianthus being the generic name of carnation. Infectivity of Dianthoviruses is dependent on both the RNA components. There are no reliable data regarding the packaging of the RNA in virus particles, but it seems most likely that Dianthoviruses have two types of particles, one containing a single molecule of RNA 1 and the other with three molecules of RNA 2. Plant cells infected with red clover necrotic mosaic virus contain numerous virus particles scattered in the cytoplasm and vacuole. Membranous vesicles and patches of densely stained amorphous material often develop in the cytoplasm of infected cells. Membranous vesicles and patches of densely stained amorphous material often develop in the cytoplasm of infected cells.
