Cycas necrotic stunt virus (CNSV) is the only well-characterized virus from gymnosperm. cDNA segments corresponding to the bipartite genome RNAs (RNA1, RNA2) were synthesized and sequenced. Each RNA encoded a single polyprotein, flanked by the 5′ and 3′ non-coding regions (NCR) and followed by a poly (A) tail. The putative polyproteins encoded by RNA1 and RNA2 had sets of motifs, which were characteristic of viruses in the genus Nepovirus . The polyproteins showed higher sequence identities to Artichoke Italian latent virus , Grapevine chrome mosaic virus and Tomato black ring virus , all of which belong to subgroup b of the genus Nepovirus , than to other nepoviruses. Phylogenetic analysis of RNA dependent RNA polymerase and coat protein also showed closer relationships with these viruses than other viruses. The data obtained supported the taxonomical status of CNSV as a definitive member of the genus Nepovirus , subgroup b.
Archives of Virology – Springer Journals
Published: Oct 1, 2002
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