Pospiviroid
''Pospiviroid'' is a genus of viroids that most commonly infects tubers. It belongs to the family ''Pospiviroidae''. The first viroid discovered was a pospiviroid, the PSTVd The potato spindle tuber viroid (PSTVd) was the first viroid to be identified.Disco ...

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 region sequence. The genome consists (in this order) of an LH terminal domain, a pathogenic domain, conserved central region ( pospiviroid RY motif stem loop), variable domain, and an RH terminal domain. ''Pospiviroidae'' replication occurs in an asymmetric fashion via host cell RNA polymerase, RNase, and RNA ligase. Taxonomy The family contains the following genera: * ''Apscaviroid'' * '' Cocadviroid'' * '' Coleviroid'' * ''Hostuviroid'' * ''Pospiviroid ''Pospiviroid'' is a genus 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 ...'' References External linksICTV R ...
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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 economic importance to humans varies widely. The first discoveries of viroids in the 1970s triggered the historically third major extension of the biosphere—to include smaller lifelike entities —after the discoveries in 1675 by Antonie van Leeuwenhoek (of the "subvisible" microorganisms) and in 1892–1898 by Dmitri Iosifovich Ivanovsky and Martinus Beijerinck (of the "submicroscopic" viruses). The unique properties of viroids have been recognized by the International Committee on Taxonomy of Viruses, in creating a new order of subviral agents. The first recognized viroid, the pathogenic agent of the potato spindle tuber disease, was discovered, initially molecularly characterized, and named by Theodor Otto Diener, plant pathologist a ...
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Viroids
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 economic importance to humans varies widely. The first discoveries of viroids in the 1970s triggered the historically third major extension of the biosphere—to include smaller lifelike entities —after the discoveries in 1675 by Antonie van Leeuwenhoek (of the "subvisible" microorganisms) and in 1892–1898 by Dmitri Iosifovich Ivanovsky and Martinus Beijerinck (of the "submicroscopic" viruses). The unique properties of viroids have been recognized by the International Committee on Taxonomy of Viruses, in creating a new order of subviral agents. The first recognized viroid, the pathogenic agent of the potato spindle tuber disease, was discovered, initially molecularly characterized, and named by Theodor Otto Diener, plant pathologist a ...
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Potato Spindle Tuber Viroid
The potato spindle tuber viroid (PSTVd) was the first viroid to be identified.Discovery of Viroids
PSTVd is a small, single stranded molecule closely related to the chrysanthemum stunt viroid. Present within the viroidal RNA is the common to its genus. The natural hosts are

PSTVd
The potato spindle tuber viroid (PSTVd) was the first viroid to be identified.Discovery of Viroids
PSTVd is a small, single stranded molecule closely related to the chrysanthemum stunt viroid. Present within the viroidal RNA is the Pospiviroid RY motif stem loop common to its genus. The natural hosts are

Citrus Exocortis Viroid
Citrus exocortis is a disease of citrus plants, caused by the Citrus exocortis viroid (CEVd). It can cause stunted growth and reduced yields in affected plants. The disease is also sometimes called "scalybutt". CEVd can also infect tomato plants. The resulting disease is sometimes called "tomato bunchy top disease." Symptoms Other symptoms include leaf epinasty, stunting, and necrosis of the leaf midvein. Affected trees will show rootstock "shelling" where the bark peels off of the rootstock the lower tree that the main orange cultivar was grafted onto. Generally trifoliate orange rootstocks and their hybrids are susceptible. Management Infected trees should be culled from the orchard. When pruning in infected orchards, tools must be vigorously bleached between cuts to prevent cross-contamination and the spread of infections. Heat does not kill the viroid. See also * List of citrus diseases A ''list'' is any set of items in a row. List or lists may also refer to: Peopl ...
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Chrysanthemum Stunt Viroid
Chrysanthemums (), sometimes called mums or chrysanths, are flowering plants of the genus ''Chrysanthemum'' in the family Asteraceae. They are native to East Asia and northeastern Europe. Most species originate from East Asia and the center of diversity is in China.Liu, P. L., et al. (2012)Phylogeny of the genus ''Chrysanthemum'' L.: Evidence from single-copy nuclear gene and chloroplast DNA sequences.''PLOS One'' 7(11), e48970. . Countless horticultural varieties and cultivars exist. Description The genus ''Chrysanthemum'' are perennial herbaceous flowering plants, sometimes subshrubs. The leaves are alternate, divided into leaflets and may be pinnatisect, lobed, or serrate (toothed) but rarely entire. The compound inflorescence is an array of several flower heads, or sometimes a solitary head. The head has a base covered in layers of phyllaries. The simple row of ray florets is white, yellow, or red. The disc florets are yellow. Pollen grains are approximately 34 micro ...
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Columnea Latent Viroid
''Columnea'' is a genus of around 200 species of epiphytic herbs and shrubs in the family Gesneriaceae, native to the tropics of the Americas and the Caribbean. The tubular or oddly shaped flowers are usually large and brightly colored – usually red, yellow, or orange – sometimes resembling a fish in shape. A common name is flying goldfish plants (see also the related ''Nematanthus'') due to the unusual flower shape. The genus was named by Carl Linnaeus after the Latinized spelling of the name of the 16th-century Italian botanist Fabio Colonna (Latin: ''Fabius Columnus''). The segregate genus '' Bucinellina'' is considered by many botanists a synonym of ''Columnea''. A full list of the species now accepted in the genus, along with their synonyms, can be found at the World Checklist of Gesneriaceae. Cultivation ''Columnea'' species grow as epiphytic plants in the wild and require bright light, good air circulation, and a well-drained growing medium that is allowed ...
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Iresine Viroid 1
''Iresine'' is a genus of flowering plants in the family Amaranthaceae. It contains 20 to 25 species, all of which are native to the American tropics. The generic name is derived from the Greek word εριος (''erios''), meaning "wooly", referring to the trichome-covered flowers. Bloodleaf is a common name for those species that have colored foliage, and these are often cultivated as ornamental plants. Some species are additives to versions of the hallucinogenic drink ayahuasca. Species , Plants of the World Online accepted the following species: *''Iresine ajuscana'' Suess. & Beyerle *''Iresine alternifolia'' S.Watson *'' Iresine angustifolia'' Euphrasén – White snowplant *''Iresine arbuscula'' Uline & W.L.Bray *'' Iresine arrecta'' Standl. *'' Iresine borschii'' Zumaya & Flores Olv. *'' Iresine cassiniiformis'' S.Schauer *''Iresine chrysotricha'' (Suess.) Borsch, Flores Olv. & Kai Müll. *''Iresine cubensis'' Borsch, Flores Olv. & Kai Müll. *''Iresine diffusa'' Humb. ...
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Pepper Chat Fruit Viroid
Pepper or peppers may refer to: Food and spice * Piperaceae or the pepper family, a large family of flowering plant ** Black pepper * ''Capsicum'' or pepper, a genus of flowering plants in the nightshade family Solanaceae ** Bell pepper ** Chili pepper * Sichuan pepper, a strong spice *"Alder pepper", the flower of ''Alnus alnobetula'' Music * Pepper (band), a rock-reggae band originally from Hawaii * The Peppers, a French male instrumental group * "Pepper" (song), a 1996 song by Butthole Surfers * "Pepper", an instrumental song by Linkin Park from ''LP Underground 12'' People and fictional characters * Pepper (name), a list of people and fictional characters with either the given name or surname * Peppers (name), a list of people with the surname Science and technology * Pepper (cryptography), a secret value added before hashing * Pepper (robot), a humanoid robot by Aldebaran Robotics and SoftBank Mobile * PPAPI or Pepper Plugin API, an interface for web browser plugins S ...
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Tomato Apical Stunt Viroid
The tomato is the edible berry of the plant ''Solanum lycopersicum'', commonly known as the tomato plant. The species originated in western South America, Mexico, and Central America. The Mexican Nahuatl word gave rise to the Spanish word , from which the English word ''tomato'' derived. Its domestication and use as a cultivated food may have originated with the indigenous peoples of Mexico. The Aztecs used tomatoes in their cooking at the time of the Spanish conquest of the Aztec Empire, and after the Spanish encountered the tomato for the first time after their contact with the Aztecs, they brought the plant to Europe, in a widespread transfer of plants known as the Columbian exchange. From there, the tomato was introduced to other parts of the European-colonized world during the 16th century. Tomatoes are a significant source of umami flavor. They are consumed in diverse ways: raw or cooked, and in many dishes, sauces, salads, and drinks. While tomatoes are fruits—bota ...
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