''Pospiviroid'' is a
genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...
of
viroid
Viroids are small single-stranded, circular RNAs that are infectious pathogens. Unlike viruses, they have no protein coating. All known viroids are inhabitants of angiosperms (flowering plants), and most cause diseases, whose respective economi ...
s that most commonly infects tubers. It belongs to the family ''
Pospiviroidae
The Pospiviroidae are a family of viroids, including the first viroid to be discovered, PSTVd. Their secondary structure is key to their biological activity. The classification of this family is based on differences in the conserved central re ...
''.
The first viroid discovered was a pospiviroid, the
PSTVd
The potato spindle tuber viroid (PSTVd) was the first viroid to be identified.[Disco ...](_blank)
species (potato spindle tuber viroid).
References
External links
ICTV Report: ''Pospiviroidae''
Viroids
Virus genera
{{Virus-stub