Occurrence of grapevine leafroll-associated virus 5 in Portugal: genetic variability and population structure in field-grown grapevines.

Abstract:

:A comparison of 15 field isolates of grapevine leafroll-associated virus 5 (GLRaV-5) was conducted, based on the analysis of nucleotide sequences of two viral ORFs: the coat protein (CP) and the heat shock protein 90 homolog (HSP90h). After amplification and cloning, the population of viral sequences was analyzed for each isolate, revealing the within-isolate presence of sequence variants for both genes, with one or more major CP variants. Phylogenetic analysis showed the gene sequence variants detected to be exclusive for each isolate. These data, together with estimates of genetic diversity and positive selection, did not reveal evidence of vector-mediated transfer of GLRaV-5. Conversely, a strong effect of host vegetative propagation on divergence dynamics of GLRaV-5 variants was suggested by the isolates from this work The phylogeny of the CP gene further revealed clustering of GLRaV-5 isolates into eight lineages, four of which were detected in our study, revealing a higher diversity than previously described. The information gathered also contributes to firmly establishing GLRaV-5 as a cohesive taxonomic group within the ampeloviruses.

journal_name

Arch Virol

journal_title

Archives of virology

authors

Esteves F,Teixeira Santos M,Eiras-Dias JE,Fonseca F

doi

10.1007/s00705-012-1371-2

subject

Has Abstract

pub_date

2012-09-01 00:00:00

pages

1747-65

issue

9

eissn

0304-8608

issn

1432-8798

journal_volume

157

pub_type

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