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Role of Tobacco vein banding mosaic virus 3'-UTR on virus systemic infection in tobacco.
Virology 2018 November 17
To investigate the role of Tobacco vein banding mosaic virus (TVBMV) 3'-UTR in virus systemic infection, three types of deletions were introduced into TVBMV infectious clone pCaTVBMV-GFP. Mutants with deletions at the nucleotide position 8-42, 43-141, or 163-174 in the 3'-UTR failed to cause systemic infection in N. benthamiana plants. Other deletion mutants caused delayed systemic infection and milder vein clearing and mosaic symptoms. Most progeny mutant virus had acquired nucleotides, similar to or different from the deleted nucleotide sequences, after a single passage in the host plant. Nucleotides at the position 8-42 near the 5'-terminus of TVBMV 3'-UTR could form a stem-loop (SL) like structure which was crucial for TVBMV systemic movement in tobacco. We proposed that this SL like structure, and thus 3'-UTR, has an essential role in TVBMV systemic infection.
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