Ugandan cassava brown streak virus (UCBSV) | BCH-ORGA-SCBD-115109 | Organism | Biosafety Clearing-House


Organism (ORGA)

last updated: 30 Jun 2020
Organism information
Ugandan cassava brown streak virus
Kingdom Orthornavirae
Phylum Pisuviricota
Class Stelpaviricetes
Order Patatavirales
Family Potyviridae
Genus Ipomovirus
Species Ugandan cassava brown streak virus
Additional classification
Group IV (+ssRNA)
Characteristics related to biosafety
The first reported incidence of Cassava brown streak disease was in Northeastern Tanzania in 1936.
The virus can be found in cassava growing regions of central and eastern Africa.
The virus infects mature (or nearly mature) leaves and characteristically causes chlorotic or necrotic vein banding. Dark, necrotic lesions appear within the tuber tissue and lead to post-harvest spoilage. Lesions can also sometimes appear on young (green) stems, but this is uncommon. Disease symptoms vary greatly and are influenced strongly by environmental conditions.

The virus is transmitted mechanically via cuttings. Whiteflies (Bemisia tabaci) have also been suggest as a vector for viral transmission.
  • Research
  • Other (Phytopathogen)
Additional Information
Ugandan cassava brown streak virus (UCBSV) is a monopartite, (positive) single stranded RNA virus consisting of around 9050 nucleotides and a poly-A tail. The viral genome is encapsulated by the 43 kiloDalton coat protein. UCBSV contains a similar arrangement to the Cassava brown streak viral genome.

Please note that UCBSV is closely related to Cassava brown streak virus (CBSV), which are the causal agents in Cassava Brown Streak Disease in cassava. The symptoms are similar between the two viruses. However, CBSV infects cassava more readily than UCBSV and causes more severe symptoms.
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