Genus of plant-infecting viruses containing multiple circular single-stranded DNA molecules. The type species is the Subterranean clover stunt virus group. The Nanoviridae consist of viruses with small (18-19 nm) isometric virions and a multipartite (6 to 8 or more segments) ssDNA genome, each segment of which is circular and about 1kb in size. The small size of the genome segments and the stunting effects often caused in plants explain the name (from the Greek nanos = small). It contains the legume-infecting members which probably have 8 (or more) monocistronic segments, while those with six segments and two unidirectionally transcribed ORFs on DNA1 have now been placed in the genus Babuvirus. The virions are isometric (icosahedral), not enveloped and 18-19 nm in diameter. They have multipartite (8 or possibly more segments), closed circular single stranded DNA, each segment about 1kb in size. Additional DNA segments associated with some isolates and encoding replication-associated proteins are now regarded as Nanovirus-associated satellite DNAs.According to
ICTVdb , the species in the genus are: Faba bean necrotic yellows virus, milk vetch dwarf virus, and subterranean clover stunt virus,
