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Glasa M.,Slovak Academy of Sciences | Prikhodk Y.,Federal State Organization All Russian Plant Quarantine Center | Predajoa L.,Slovak Academy of Sciences | Nagyova A.,Slovak Academy of Sciences | And 5 more authors.
Phytopathology | Year: 2013

Plum pox virus (PPV) is the causal agent of sharka, the most detrimental virus disease of stone fruit trees worldwide. PPV isolates have been assigned into seven distinct strains, of which PPV-C regroups the genetically distinct isolates detected in several European countries on cherry hosts. Here, three complete and several partial genomic sequences of PPV isolates from sour cherry trees in the Volga River basin of Russia have been determined. The comparison of complete genome sequences has shown that the nucleotide identity values with other PPV isolates reached only 77.5 to 83.5%. Phylogenetic analyses clearly assigned the RU-17sc, RU-18sc, and RU-30sc isolates from cherry to a distinct cluster, most closely related to PPV-C and, to a lesser extent, PPV-W. Based on their natural infection of sour cherry trees and genomic characterization, the PPV isolates reported here represent a new strain of PPV, for which the name PPV-CR (Cherry Russia) is proposed. The unique amino acids conserved among PPV-CR and PPV-C cherry-infecting isolates (75 in total) are mostly distributed within the central part of P1, NIa, and the N terminus of the coat protein (CP), making them potential candidates for genetic determinants of the ability to infect cherry species or of adaptation to these hosts. The variability observed within 14 PPV-CR isolates analyzed in this study (0 to 2.6% nucleotide divergence in partial CP sequences) and the identification of these isolates in different localities and cultivation conditions suggest the efficient establishment and competitiveness of the PPV-CR in the environment. A specific primer pair has been developed, allowing the specific reverse-transcription polymerase chain reaction detection of PPV-CR isolates. © 2013 The American Phytopathological Society.

Glasa M.,Slovak Academy of Sciences | Shneyder Y.,Federal State Organization All Russian Plant Quarantine Center | Predajna L.,Slovak Academy of Sciences | Zhivaeva T.,Federal State Organization All Russian Plant Quarantine Center | Prikhodko Y.,Federal State Organization All Russian Plant Quarantine Center
Journal of Plant Pathology | Year: 2014

Plum pox virus (PPV)-positive samples from one sweet (Prunus avium) and four sour cherry (P. cerasus) trees from three geographically distinct regions of Russia (Moscow, Samara and Volgograd) were analysed. The average genetic distance among the five Russian PPV-C isolates in the region spanning the 3´terminal part of the nuclear inclusion b gene (NIb) and the hypervariable 5´terminal part of the coat protein gene reached 1.6%. To widen the information on PPV-C diversity, the full-length genome sequence of an isolate (Volk143) was determined directly from the original host tissues. The analysis of the complete genome sequences showed a high identity of Volk143 and the previously characterised PPV-C isolates with only 1.4-1.8% divergence. Co-infection with the recently identified PPVCR strain was not observed, even though the PPV-CR is known to occur in the regions of origin of the isolates studied here. The present results unambiguously confirm the natural infection of sweet and sour cherry trees by PPV-C in different Russian regions and further contribute to our understanding of the poorly known PPV-C diversity. © 2014, Edizioni ETS. All rights reserved

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