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Raspberry latent virus, a new Reovirus isolated from crumbly fruited red Raspberry plants

Abstract:

A virus induced crumbly fruit disease of red raspberry cultivars has been observed in northern Washington, USA and British Columbia, Canada. Raspberry bushy dwarf virus (RBDV) and Raspberry leaf mottle virus (RLMV) were detected in raspberries with severe crumbly fruit. In addition, a novel Reovirus, Raspberry latent virus (RpLV) that does not cause symptoms in single infections was isolated from these plants. The polymerase sequence has 36% aa sequence identity to Rice ragged stunt virus (RRSV, an Oryzavirus). The lack of conservation between the terminal sequences of RpLV and RRSV, as well as the absence of homologs for segments S3b, S6, S7, and S10b, and the distinct hosts for these viruses justify the creation of a new genus for the classification of RpLV. These findings along with the lack of severe crumbly fruit symptoms in 'Meeker' red raspberry singly infected with RBDV in Oregon, suggest the existence of a novel virus complex associated with severe crumbly fruit in red raspberries.