The virus isolate 2009-GZT, collected from tomato in Guizhou province of China, was identified as a new member of the genus Tospovirus based on its S RNA sequence. Because its provisional name, “tomato necrotic spot virus” (TNSV), was identical to an already existing member of the genus Ilarvirus , 2009-GZT was renamed “tomato necrotic spot-associated virus” (TNSaV). In this study, the full-length sequences of the genomic M and L RNAs of TNSaV were determined and analyzed. The M RNA has 4,773 nucleotides (nt), encoding the NSm protein of 309 aa (34.4 kDa) in the viral (v) strand and the glycoprotein precursor (Gn/Gc) of 1123 aa (128 kDa) in the viral complementary (vc) strand. The NSm and Gn/Gc of TNSaV share the highest aa sequence identity (86.2 % and 86.9 %, respectively) with those of tomato zonate spot virus. The L RNA contains 8,908 nt and codes for the putative RNA-dependent RNA polymerase (RdRp) of 2885 aa (332 kDa) in the vc strand. The RdRp of TNSaV shares the highest aa sequence identity (85.2 %) with that of calla lily chlorotic spot virus (CCSV). Serological assays showed that TNSaV cross-reacts with rabbit antisera against watermelon silver mottle virus (WSMoV) NP and CCSV NP, indicating that TNSaV is a member of the WSMoV serogroup.
Archives of Virology – Springer Journals
Published: May 1, 2016
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