Bromoviridae and Allies

Abstract

The family Bromoviridae consists of six genera: Alfamovirus, Anulavirus, Bromovirus, Cucumovirus, Ilarvirus and Oleavirus. All viruses in these genera possess tripartite genomes of single‐stranded, linear, positive‐sense ribonucleic acid (RNA), in which expression of the downstream codon of the RNA3 is via a subgenomic messenger RNA (mRNA) (RNA4). Raspberry bushy dwarf virus (RBDV) was the sole member of the genus Idaeovirus for many years and shares features in common with members of the genus Ilarvirus and Alfamovirus, but possesses a bipartite genome and is not currently assigned to a family. Members of the genera Alfamovirus, Bromovirus and Cucumovirus have been used extensively as model systems for research on molecular aspects of plant virology.

Key Concepts:

  • Although all members of the Bromoviridae have similar particle morphologies (quasi‐spherical and bacilliform) and possess tripartite genomes, a range of different strategies is used to express the products of the different genomes.

  • The phenomenon of genome activation by the coat protein was unique to the ilarviruses and Alfalfa mosaic virus but has recently been demonstrated for RBDV.

  • The natural host ranges of Cucumber mosaic virus and Alfalfa mosaic virus are extensive whereas many other viruses described in this article have an extremely limited natural host range.

  • Complete genomic nucleotide sequences are available from GenBank for the majority of viruses referred to in this article.

Keywords: Alfamovirus; Anulavirus; Bromovirus; Cucumovirus; Ilarvirus; Oleavirus; Idaeovirus

Figure 1.

Genomic arrangements of the Bromoviridae and allies. (a) The genera , Alfamovirus, Anulavirus, Bromovirus and some members of the genus Ilarvirus. (b) The genus Cucumovirus and some members of the genus Ilarvirus. An additional 2b ORF is present. (c) The genus Oleavirus. (d) The genus Idaeovirus. ×××, N‐methyl transferase motif; +++, helicase motif; ooo, polymerase motif found in the putative translation products of the RNA1 and RNA2 of all members of the Bromoviridae and in the RNA1 of RBDV. MP, movement protein; CP, coat protein. See Table for the sizes of the individual RNA molecules within the genomes. sg, subgenomic.

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Further Reading

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How to Cite close
Scott, Simon W(May 2011) Bromoviridae and Allies. In: eLS. John Wiley & Sons Ltd, Chichester. http://www.els.net [doi: 10.1002/9780470015902.a0000745.pub3]