Family: Endornaviridae

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%.