ICTV Virus Taxonomy Profile: Pospiviroidae.


Di Serio F(1), Owens RA(2), Li SF(3), Matoušek J(4), Pallás V(5), Randles JW(6), Sano T(7), Verhoeven JTJ(8), Vidalakis G(9), Flores R(5), Ictv Report Consortium.
Author information:
(1)Istituto per la Protezione Sostenibile delle Piante, Consiglio Nazionale delle Ricerche, Bari, 70126, Italy.
(2)Molecular Plant Pathology Laboratory, US Department of Agriculture, Agricultural Research Service, Beltsville, MD 20705, USA.
(3)State Key Laboratory of Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, PR China.
(4)Institute of Plant Molecular Biology, Biology Centre of the Czech Academy of Sciences, 37005 České Budějovice, Czech Republic.
(5)Instituto de Biología Molecular y Celular de Plantas, Universidad Politécnica de Valencia-Consejo Superior de Investigaciones Científicas, Valencia, 46010, Spain.
(6)School of Agriculture, Food and Wine, The University of Adelaide, Waite Campus, Glen Osmond, SA 5064, Australia.
(7)Faculty of Agriculture and Life Science, Hirosaki University, Hirosaki 036-8561, Japan.
(8)Plant Protection Organization of the Netherlands, Wageningen, 6700 HC, Netherlands.
(9)Department of Microbiology and Plant Pathology, University of California, Riverside, CA 92521, USA.


Members of the family Pospiviroidae have single-stranded circular RNA genomes that adopt a rod-like or a quasi-rod-like conformation. These genomes contain a central conserved region that is involved in replication in the nucleus through an asymmetric RNA-RNA rolling-circle mechanism. Members of the family Pospiviroidae lack the hammerhead ribozymes that are typical of viroids classified in the family Avsunviroidae. The family Pospiviroidae includes the genera Apscaviroid, Cocadviroid, Coleviroid, Hostuviroid and Pospiviroid, with >25 species. This is a summary of the ICTV Report on the family Pospiviroidae, which is available at ictv.global/report/pospiviroidae.