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Alfalfa (Medicago sativa) is a natural host plant for many plant pathogens including fungi, bacteria, nematodes and viruses. Alfalfa latent virus (ALV) is strain of Pea streak virus, a member of the carlavirus group that occurs symptomlessly in alfalfa. The first complete genomic sequence of the ALV that was recently obtained in our laboratory showed that the virus differs substantially from other members of the genus Carlavirus. Here we report generation of infectious RNA transcripts from the constructed full-length viral cDNA clone as a proof that ALV nucleotide sequence is correct and as an initial step toward development of the ALV-based vector for gene silencing and expression of foreign proteins in alfalfa. This is the first report describing the development of a complete cDNA clone of the ALV strain of Pea streak virus and its infectivity in the diagnostic pea (Pisum sativum) and natural alfalfa hosts.

Development and characterization of the first infectious clone of alfalfa latent virus, a strain of Pea streak virus