Genomic characterization and survey of a second luteovirus infecting blueberries.

New and emerging viral problems may be contributing to blueberry decline. In this research we described a new virus detected in Oregon blueberry production field and surveyed the region for its potential spread. The complete genome sequence of a putative new member of the genus Luteovirus was obtained from blueberry (Vaccinium corymbosum L.) by high throughput sequencing and 5'/3'-RACE. The new virus was tentatively named blueberry virus M (BlVM). Its genome is 5,018 nt long with four putative open reading frames. Similarly to some recently discovered luteoviruses, BlVM does not possess any movement protein (MP). Phylogenetic analysis confirmed clustering of BlVM with the group of non-MP luteoviruses, showing blueberry virus L as the most similar species. Through a small-scale high throughput sequencing survey we obtained 14 additional near complete genomic sequences. A larger survey of 2,654 samples by RT-PCR in Oregon and Washington (USA) found 52 BlVM-positive plants collected from four locations in Oregon. These findings will facilitate monitoring virus distribution and assessment of potential disease associated with this new and emerging blueberry virus.