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1.
Arch Virol ; 157(2): 401-3, 2012 Feb.
Article in English | MEDLINE | ID: mdl-22139355

ABSTRACT

Isolates of potato virus Y (PVY) have been divided into several strains. We determined the genomic sequences of PVY isolates AQ4 and FZ10 from tobacco in China. AQ4 and FZ10 had genome of 9700 and 9698 nucleotides, respectively. In phylogenetic analysis of complete genome sequences, AQ4 was clustered with strain N-Wi, and FZ10 with NTN. AQ4 had two recombination sites within the P1 and P3 genes, while FZ10 had three within the P1, P3 and NIa-Pro genes. When compared to typical NTN isolates, FZ10 lacked a recombination site within the CP gene and, thus, represents a novel recombination type of PVY.


Subject(s)
Nicotiana/virology , Plant Diseases/virology , Potyvirus/genetics , Potyvirus/isolation & purification , Reassortant Viruses/genetics , Reassortant Viruses/isolation & purification , Recombination, Genetic , China , Genome, Viral , Phylogeny , Potyvirus/classification , Reassortant Viruses/classification
2.
Virus Genes ; 40(3): 447-51, 2010 Jun.
Article in English | MEDLINE | ID: mdl-20221681

ABSTRACT

Potato virus X (PVX) is one of the most common plant viruses that cause great economic losses to solanaceous plants. We have previously reported the complete genomic sequence of the 2006 Chinese potato isolate FX21 and demonstrated that PVX isolates cluster into two groups: Eurasia and America. Here, we present the complete genomic sequence of one PVX isolate collected from potato in 1985 (PVX-1985). The genome of PVX-1985 is identical to that of FX21 in length and has the same genomic structure. PVX-1985, which like FX21 fell within the Eurasia group, clustered together with isolates from Europe, whereas FX21 clustered together with isolates of primarily Asian origin. Phylogenetic analyses of the complete genomic sequences and of CP gene sequences showed that Chinese PVX isolates have different origins and were introduced via multiple events. Though all the open reading frames of PVX are under negative/purifying selection, the central region of RNA-dependent RNA polymerase is under positive/diversifying selection.


Subject(s)
Genome, Viral , Phylogeny , Plant Diseases/virology , Potexvirus/genetics , Potexvirus/isolation & purification , RNA, Viral/genetics , Solanum tuberosum/virology , China , Cluster Analysis , Molecular Epidemiology , Molecular Sequence Data , Polymorphism, Genetic , Potexvirus/classification , Sequence Analysis, DNA
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