Molecular Characterization and Infectious cDNA Clone of a Korean Isolate of Pepper mild mottle virus from Pepper

摘要

A Korean isolate of Pepper mild mottle virus PMMoV-Kr was isolated from a diseased hot pepper plant and its biological and molecular properties were compared to that of PMMoV-J and PMMoV-S. The genomic RNA of PMMoV-Kr consists of 6,356 nucleotides.The nucleotide and ammo acid sequences identities of four viral proteins and two noncoding regions among PMMoV-Kr, PMMoV-S and PMMoV-J were 96.9% to 100.0% and 97.5% to 98.6%, respectively. Full-length cDNA amplicon of PMMoV-Kr was directly amplified byRT-PCR with a set of 5'-end primer anchoring T7 RNA promoter sequence and 3'-end virus-specific primer. Capped transcript RNAs from the full-length cDNA clone were highly infectious and caused characteristic symptoms of wild type PMMoV when mechanicallyinoculated to systemic host plants such as Nicotiana benthamiana and pepper plants.