Abstract
Sclerotinia sclerotiorum hypovirulence-associated DNA virus 1 (SsHADV-1) is the first identified DNA mycovirus; it confers hypovirulence to its host, Sclerotinia sclerotiorum. In this article, the host, virion morphology, genome structure, ORFs, and proteins of SsHADV-1 were described. SsHADV-1 has unique abilities to infect extracellularly, be transmitted by, and have mutualistic interaction with, mushroom sciarid fly. These provide SsHADV-1 with huge potential on biological control of crop fungal disease caused by S. sclerotiorum. On taxonomy, the discovery of SsHADV-1 as well as subsequent identification of related viruses prompted the International Committee on Taxonomy of Viruses to establish a new family Gemonoviridae. SsHADV-1 is the exemplar virus of the type species Sclerotinia gemycircularvirus 1 of the family, and its related viruses in this family are widely spread in various niches.
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