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Using a cDNA expression cassette in combination with agroinoculation of potato leaf discs we have investigated the role the protein encoded by ORF0 of Potato leafroll virus (PLRV) and have shown its importance for virus accumulation. Two mutations introduced into ORF0 by site-directed mutagenesis prevented expression of the corresponding protein and completely abolished virus accumulation in plant cells. They did not, however, affect translation of ORF1 and ORF2. We therefore conclude that ORF0 of PLRV produces a protein essential for virus accumulation, a hitherto undescribed finding.

The ORF0 product of Potato leafroll virus is indispensable for virus accumulation