Genus: Fabavirus

Genus: Fabavirus

Distinguishing features

Fabaviruses have bipartite genomes encapsidated by two capsid proteins (CP) and are transmitted by aphids. 

Virion

See discussion under family description.

Genome organisation and replication

The genomic organization of fabaviruses is similar to that of comoviruses. Similar to comoviruses, RNA-2 encodes two overlapping polyproteins with the N-terminal protein playing a role in the replication of RNA-2 and the overlapping movement protein being synthesized through initiation at the second AUG codon (Lin et al., 2014). The movement protein was also confirmed to be a structural component of the tubular structures that traverse the cell wall (Liu et al., 2011) (Figure 3.Secoviridae). The cleavage of polyproteins is presumed to be similar to that of comoviruses but this has not been investigated in detail.

Biology

Fabaviruses have wide host ranges among dicotyledonous plants and some families of monocotyledonous plants. Symptoms are ringspots, mottling, mosaic, distortion, wilting and apical necrosis. In nature, fabaviruses are transmitted by aphids in a non-persistent manner.

Species demarcation criteria

See discussion under family description.

Member species

Exemplar isolate of the species
SpeciesVirus nameIsolateAccession numberRefSeq numberAvailable sequenceVirus Abbrev.
Broad bean wilt virus 1broad bean wilt virus 1ATCC PV132RNA-1: AB084450;
RNA-2: AB084451
All
RNA-1: NC_005289;
RNA-2: NC_005290
All
Complete genomeBBWV1
Broad bean wilt virus 2broad bean wilt virus 2MERNA-1: AF225953;
RNA-2: AF225954
All
RNA-1: NC_003003;
RNA-2: NC_003004
All
Complete genomeBBWV2
Cucurbit mild mosaic viruscucurbit mild mosaic virusBeijingRNA-1: EU881936;
RNA-2: EU881937
All
RNA-1: NC_038760;
RNA-2: NC_038759
All
Complete genomeCuMMV
Fabavirus PLPaVpeach leaf pitting-associated virus AKY867750;
KY867751
All
Complete genomePLPaV
Gentian mosaic virusgentian mosaic virusN-1RNA-1: AB084452;
RNA-2: AB084453
All
Complete genomeGeMV
Grapevine fabavirusGrapevine fabavirusNPRNA-1: KX241482;
RNA-2: KX241485
All
RNA-1: NC_039073;
RNA-2: NC_039072
All
Complete coding genomeGFabV
Lamium mild mosaic virusLamium mild mosaic virusDSMZ PV-0454RNA-1: KC595304;
RNA-2: KC595305
All
RNA-1: NC_023016;
RNA-2: NC_023017
All
Complete genomeLMMV
Prunus virus FPrunus virus F8816-v1RNA-1: KX269865;
RNA-2: KX269871
All
RNA-1: NC_039077;
RNA-2: NC_039078
All
Complete genomePrVF

Virus names, the choice of exemplar isolates, and virus abbreviations, are not official ICTV designations.