The 3'-part of the movement protein gene, the intergenic region and the complete coat protein gene of sixteen isolates of Prunus necrotic ringspot virus (PNRSV) from five different host species from the Czech Republic were sequenced in order to search for the bases of extensive variability of viroses caused by this pathogen. According to phylogenetic analyses all the 46 isolates sequenced to date split into three main groups, which correlated to a certain extend with their geographic origin. Modelled serological properties showed that all the new isolates belong to one serotype.
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