Potato spindle tuber viroid

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Potato spindle tuber viroid
Potato Potato spindle tuber viroid.jpg
Scientific Classification
Family: Pospiviroidae
Genus: Pospiviroid
Species: Potato spindle tuber viroid
Potato spindle tuber viroid geographical distribution.PNG
Countries with confirmed cases of Potato spindle tuber viroid (blue) and unconfirmed (light blue)
Synonyms
Potato spindle tuber

Potato spindle tuber viroid
PSTVd

Spindelknollenkrankheit (German)

Potato spindle tuber viroid is a Pospoviroid whose natural hosts are potatoes and tomatoes as well as other Solanum spp..[1]

Symptoms[edit]

Mild strains generally cause no obvious symptoms in either potato or tomato, but can be detected experimentally in potato by cross-protection methods.[2] Severe strains in sensitive cultivars cause the following symptoms:

Potato[edit]

In the field, a clockwise phyllotaxy of the foliage may be apparent when the plants are viewed from directly above. Foliage is spindly and very upright, often being a darker green than normal and slightly rugose. There may be an accumulation of pigment at the top of the stems, usually accompanied by an upward rolling of the terminal leaflets. Axillary buds may proliferate to give symptoms similar to those of witch's broom. Plants are stunted. Tubers are small, elongated, cylindrical, spindle or dumb-bell-shaped, with prominent eyes evenly distributed over the tuber. Sprouting is slower than in healthy tubers.[1]

Tomato[edit]

Epinasty and rugosity of the apical leaves is followed by a necrosis of the leaflet midribs and a yellowing of leaflets in the central region of the plant. In the severe chronic stage, the entire plant is stunted, the apical leaves are small and compacted and the central leaves die.[1]

Control[edit]

Control is essentially by production of healthy planting material[3] and good crop sanitation. Cold treatment, followed by meristem-tip culture, can be used to eliminate PSTVd from potato stocks.[4] Resistance is looked for in potato cultivars in infested countries.[5]

Gallery[edit]

Reference[edit]

  1. a b c Data Sheets on Quarantine Pests Potato spindle tuber viroid. Retrieved: 04-01-11.
  2. Singh, R.P.; Boucher, A.; Somerville, T.H. (1990). Cross protection with strains of potato spindle tuber viroid in the potato plant and other solanaceous hosts. Phytopathology 80, 246-250.
  3. Morris, T.J.; Smith, E.M. (1977). Potato spindle tuber disease: procedures for the detection of viroid RNA and certification of disease-free potato tubers. Phytopathology 67, 145-150.
  4. Paduch-Cichal, E.; Kryczynski, S. (1987) A low temperature therapy and meristem-tip culture for eliminating four viroids from plants. Journal of Phytopathology 118, 341-346.
  5. Chrzanowska, M.; Kowalska-Noordam, A.; Zagorska, H.; Skrzeczkowska, S. (1984) [The response of Polish potato varieties to the severe strain of the spindle tuber viroid]. Biuletyn Instytutu Ziemniaka No. 31, pp. 15-27.