Abstract:
UNLABELLED:This study determined the complete nucleotide sequence of Beet cryptic virus 1 (BCV1). As expected by analogy to previously sequenced alphacryptoviruses, dsRNA1 (2008 bp) encodes a 72.5-kDa protein containing sequence motifs characteristic for RNA-dependent RNA polymerases (RdRp). In addition to the full-length dsRNA1, a truncated form was also detected in dsRNA extracts. dsRNA2 (1783 bp) codes for the viral coat protein (CP) as proven by the identity of the predicted CP sequence to peptide sequences of the purified virion protein. The amino acid sequence of BCV1 RdRp as well as the 5'- and 3'-UTRs show 81-85% identity to the corresponding regions of Vicia cryptic virus (VCV), White clover cryptic virus 1 (WCCV1) and Carrot cryptic virus (CaCV). The amino acid sequence identity of the CP is about 55-62%, moreover, a strong conservation of predicted alpha-helical regions was observed. The high degree of similarity of these seed- and pollen-transmitted viruses persisting in phylogenetically distant hosts, together with their high similarity to fungal partitiviruses strongly supports the hypothesis that horizontal transfer by a fungus played a role in the emergence of the present cryptovirus species. The change in the distribution of cryptic viruses may also be due to human influence: While earlier BCV1 occurred frequently in sugar beet cultivars, it is very rare in cultivars currently used in agricultural practice and was detected in only one of the 28 cultivars investigated in our experiments. ELECTRONIC SUPPLEMENTARY MATERIAL:The online version of this article (doi:10.1007/s11262-009-0432-4) contains supplementary material, which is available to authorized users.
journal_name
Virus Genesjournal_title
Virus genesauthors
Szego A,Enünlü N,Deshmukh SD,Veliceasa D,Hunyadi-Gulyás E,Kühne T,Ilyés P,Potyondi L,Medzihradszky K,Lukács Ndoi
10.1007/s11262-009-0432-4subject
Has Abstractpub_date
2010-04-01 00:00:00pages
267-76issue
2eissn
0920-8569issn
1572-994Xjournal_volume
40pub_type
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