Caulimovirus

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Baltimore Classification

Higher order taxa

Viruses; Retro-transcribing viruses; Caulimoviridae; Caulimovirus

Species

Blueberry red ringspot virus, Carnation etched ring virus, Dahlia mosaic virus

Description and Significance

The cauliflower mosaic virus and related caulimoviridae viruses infect crucifers, groundnuts, soybeans, and cassava. The cauliflower mosaic virus promoter sequence is used to construct vectors to put genes into transgenic plants. When the virus attacks the host, signs and symptoms may persist or vary seasonally.

Genome Structure

The genome contains a single molecule of circular and is not segmented. The genoms is made of a double stranded DNA and is -RT. Virions do not contain minor species of non-genomic nucleic acid. The complete genome is about 8000 nucleotides long. The genome is sequenced but only an estimate is available. The complete sequence is 6800-7771-8175 nucleotides long.

The genome has a guanine+cytosine content of 28-35.5-43 %. It has single-stranded discontinuities at specific sites and the transcribed strand has at least one discontinuity while the non-trnascribed strand has two discontinuities. The genome may have an intergenic poly (A) region. (source: ICTV dB Descriptions)

Virion Structure of a Caulimovirus

The virions of a caulimovirus consis of a capsid that is not envelped but round with icosahedral symmetry (T=7). The isometric capsid has a diameter of 35-47.52-50 nm. The capsid shells of virions are composed of multiple layers. The capsids appear round or hexagonal in outline. The capsomer arrangement may be clearly visible or not so obvious. (source: ICTV dB Descriptions)

Reproduction Cycle of a Caulimovirus in a Host Cell

Viral Ecology & Pathology

References