Complete nucleotide sequence of a new strain of grapevine leafroll-associated virus 3 in South Africa.

The complete genome sequences of two newly identified genetic variants of grapevine leafroll-associated virus 3 (GLRaV-3) are described. Two isolates, GH11 (18671 nt) and GH30 (18576 nt) were sequenced and found to be less than 70 % similar to other South African GLRaV-3 variants. The genome organization of GH11 and GH30 is similar to that of previously described GLRaV-3 isolates. However, no corresponding open reading frame 2 (ORF2) could be identified. Phylogenetic analysis indicates that GH11 and GH30 cluster in a subgroup (group VI) that is separate from the previously described GLRaV-3 isolates and should be regarded as a different strain of GLRaV-3.