Family: Endornaviridae

Genus: Alphaendornavirus

Distinguishing features

Alphaendornaviruses infect plants, fungi and the oomycete Phytophthora sp. They are characterized by longer genomes (>11.9 kb) than those of genus Betaendornavirus and the majority code for a glucosyltransferase domain (Figure 1. Alphaendornavirus). A site-specific nick near the 5′-end of the positive-sense strand of the replicative form has been reported for several alphaendornaviruses. 

Figure 1. Alphaendornavirus.  Genome organization of Oryza sativa endornavirus isolate Nipponbare, the exemplar isolate of the type species of genus Alphaendornavirus. Numbers refer to genome nucleotide positions. The site-specific nick is only present in the coding strand of the replicative intermediates of alphaendornaviruses. Several functional domains present in the virus-encoded polyprotein are depicted by colored boxes.

Virion

See discussion under family description. 

Genome organization and replication

See discussion under family description. 

Biology

See discussion under family description. 

Species demarcation criteria

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