Genus: Betaendornavirus

Genus: Betaendornavirus

Distinguishing features

Betaendornaviruses infect ascomycete fungi. They are characterized by having shorter genomes (<10.7 kb) than alphaendornaviruses, lack of a glucosyltransferase domain which is present in the majority of alphaendornaviruses, but all encode a methyltransferase (Figure 1.Betaendornavirus). Furthermore, studied members lack a site-specific nick near the 5′-end of the positive-sense strand.

Figure 1.Betaendornavirus. Genome organization of Sclerotinia sclerotiorum endornavirus isolate 11691, the exemplar isolate of the type species of genus Betaendornavirus. Numbers indicate genome nucleotide positions. Several functional domains present in the virus-encoded polyprotein are depicted by colored boxes 


See discussion under family description

Genome organization and replication

See discussion under family description.


See discussion under family description.

Species demarcation criteria

Members of different species have an overall nucleotide sequence identity below 75%.

Member species

Exemplar isolate of the species
SpeciesVirus nameIsolateAccession numberRefSeq numberAvailable sequenceVirus Abbrev.
Alternaria brassicicola betaendornavirus 1Alternaria brassicicola endornavirus 11KP239989NC_026136Complete genomeAbEV1
Botrytis cinerea betaendornavirus 1Botrytis cinerea endornavirus 1HBtom-372KU923747NC_031752Complete genomeBcEV1
Gremmeniella abietina betaendornavirus 1Gremmeniella abietina endornavirus 1AU58DQ399289NC_007920Complete genomeGaEV1
Rosellinia necatrix betaendornavirus 1Rosellinia necatrix endornavirus 1W1141LC076696NC_030938Complete genomeRnEV1
Sclerotinia minor betaendornavirus 1Sclerotinia minor endornavirus 1LC22MG255170NC_040631Complete genomeSmEV1
Sclerotinia sclerotiorum betaendornavirus 1Sclerotinia sclerotiorum endornavirus 111691KJ123645NC_023893Complete genomeSsEV1
Tuber aestivum betaendornavirusTuber aestivum endornavirusJaszagHQ380014NC_014904Complete genomeTaEV

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