Abstract
Potato virus Y (PVY) is one of the most important pathogenic viruses affecting potato production. Despite the importance of the virus, little information on PVY genetic diversity on potato plants in the central plain of China is available. In this study, we tested 584 symptomatic leaf samples collected from the main potato growing areas in Shandong province. Results showed that 88.2% of them were PVY positive. Sequence analysis showed that 51 PVY isolates have N-type HCpro and O-type coat protein; five samples were infected with different genotypes. Analysis of nearly complete PVY genome sequences from six field isolates and one isolate from seed potato revealed that they were close to the PVYNTN-NW SYR II group; however, they formed a separate group PVYNTN-NW CN. Moreover, our results provided evidence that PVYNTN-NW CN group isolates CN:TZ1:17 and CN:DY1:16 have obtained the ability to infect pepper systemically.
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