Geminiviridae
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| Geminiviridae | ||||
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| Virus classification | ||||
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| Genera | ||||
Geminiviruses are plant viruses which have ambisense single-stranded circular DNA and are members of class II of the Baltimore classification of viruses. The genome can either be segmented (2500-3000 nucleotides) or non-segmented (4800-5600 nucleotides).They have an elongated, geminate capsid with incomplete icosahedral symmetry of T=1 joined at the missing vertex. The capsid ranges from 18-20 nm in diameter with a length of 30nm. These viruses can be bipartite, therefore individual segments can be separated into two different particles, therefore more than one virus particle is required to infect a cell.
Transmission of these viruses can be via the leafhopper or whitefly.
Image:Good msv 3.jpg Purified Maize streak virus (MSV) particles stained with uranyl acetate. Size bar indicates 50 nm.
The Geminiviridae include the following genera:
- Genus Mastrevirus; type species: Maize streak virus
- Genus Curtovirus; type species: Beet curly top virus
- Genus Begomovirus; type species: Bean golden mosaic virus
- Genus Topocuvirus; type species: Tomato pseudo-curly top virus
[edit] References
- Description of Plant Viruses
- University of Leicester Microbiology
- International Committee on Taxonomy of Viruses
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