Spartina mottle virus (SpMV) was first reported 1980 and classified by physical and biological properties as a tentative member of the genus Rymovirus in the Potyviridae . This genus was recently separated into two genera: Rymovirus and Tritimovirus . Now the sequence of the 3′-terminal part of the genome of SpMV was determined. Additionally a virus isolate originating from Cynodon dactylon in Italy was cloned and sequenced. This Assisi-isolate shared 87.5% amino acid sequence identity with SpMV. The high degree of identity and their close serological relationship indicate that SpMV and Assisi-isolate have to be regarded as different strains of one virus. The Assisi-isolate should be designated as SpMV-AV. Comparing the C-terminal part of the ORF of several Potyviridae the sequences of SpMV strains were more similar to those of the genera Rymovirus and Potyvirus than to the genera Tritimovirus , Macluravirus , Bymovirus and Ipomovirus . The comparisons revealed identities of less than 32% for the CP and 37% for the 3′-NIb/CP region, indicating that SpMV can not be classified to any of the established genera. The results of serological tests support a separate position of SpMV in the Potyviridae . We propose to introduce the name Sparmovirus for the new genus.
Archives of Virology – Springer Journals
Published: Feb 1, 2002
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