Abstract
A novel dsRNA virus named “Thelonectria quadrivirus 1” (TQV1) was found in a member of the genus Thelonectria (Ascomycota), isolated from a root associated with stem collar necrosis of Fraxinus excelsior L. The complete genome of TQV1 is composed of four segments, each containing a single ORF on the positive sense RNA. The sequence of the 5´ (5´-(C/T)ACGAAAAA-3´) and 3´termini (5´AT(T/G)AGCAATG(T/C)GC(G/A)CG-3’) of dsRNA 1 (4876 bp), dsRNA 2 (4312 bp), dsRNA 3 (4158 bp), and dsRNA 4 (3933 bp) are conserved. Based on its genome organization and phylogenetic position, TQV1 is suggested to be a new member of the family Quadriviridae. This is the first report of a mycovirus infecting a member of the genus Thelonectria.
Highlights
The most widespread mycoviruses are viruses with a dsRNA genome
According to Kotta-Loizou et al [1], dsRNA mycoviruses are arranged in seven families (Totiviridae, P artitiviridae, Megabirnaviridae, Chrysoviridae, Quadriviridae, Endornaviridae and Reoviridae) and one genus (Botybirnavirus)
The family Quadriviridae consists of the single genus Quadrivirus
Summary
The most widespread mycoviruses are viruses with a dsRNA genome. According to Kotta-Loizou et al [1], dsRNA mycoviruses are arranged in seven families (Totiviridae, P artitiviridae, Megabirnaviridae, Chrysoviridae, Quadriviridae, Endornaviridae and Reoviridae) and one genus (Botybirnavirus). As it is typical for members of the family Quadriviridae [2, 12, 13], each of the four dsRNA segments contains a single ORF on the positive-sense RNA strand (Fig. 2A).
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