Varvara I. Maliogka

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A study of the evolutionary relationships of GLRaV-4,-5,-6 and -9, and two new Ampelovirus isolates (GLRaV-Pr and -De) related to grapevine leafroll disease was conducted based on molecular variability, positive selection analysis and maximum likelihood phylogenetic reconstructions. Sequences corresponding to the N-terminal HSP70h and full CP encoding genes(More)
A new grapevine leafroll-associated virus isolate (GLRaV-Pr) from Greek grapevines was recently reported. This virus, along with the genetically related GLRaV-4, -5, -6 and -9, form a separate diverse lineage within the genus Ampelovirus. In this paper, the complete nucleotide sequence of GLRaV-Pr was determined, making it the first fully sequenced virus of(More)
Roditis leaf discoloration (RLD), a graft-transmissible disease of grapevine, was first reported in Greece in the 1980s. Even though various native grapevine viruses were identified in the affected vines, the etiology of the disease remained unknown. In the present study, we used an NGS platform for sequencing siRNAs from a twenty-year old Roditis vine(More)
In this study a two-step RT-PCR assay was developed for the generic detection of poleroviruses. The RdRp coding region was selected as the primers' target, since it differs significantly from that of other members in the family Luteoviridae and its sequence can be more informative than other regions in the viral genome. Species specific RT-PCR assays(More)
In this study, a generic ramped-annealing (RAN) nested RT-PCR was developed, allowing the simultaneous detection and fast characterization of ilarviruses. The method involves a one-step RT-PCR in which a pair of degenerate primers amplifies a 381-bp part of the polymerase gene (RNA2), followed by a nested PCR amplification that increases detection(More)
Grapevine is a high value vegetatively propagated fruit crop that suffers from numerous viruses, including some that seriously affect the profitability of vineyards. Nowadays, 64 viruses belonging to different genera and families have been reported in grapevines and new virus species will likely be described in the future. Three viral diseases namely(More)
A nested RT-PCR was developed, that allows the generic detection of a subgroup of genetically related viruses with a distinct evolutionary history within the genus Ampelovirus. Members of this lineage are Grapevine leafroll associated virus-4, -5, -6, -9 and two isolates (GLRaV-De and GLRaV-Pr) that have been recently characterized and represent new(More)
A novel strategy employing the rhabdovirus untranslated conserved intergenic regions was developed and applied successfully for the determination of the complete nucleotide sequence of Eggplant mottled dwarf virus (EMDV). The EMDV genome contains seven open reading frames with the same organization as Potato yellow dwarf virus (PYDV), the type species of(More)
Routes of avian influenza virus (AIV) dispersal among aquatic birds involve direct (bird-to-bird) and indirect (waterborne) transmission. The environmental persistence of H5N1 virus in natural water reservoirs can be assessed by isolation of virus in embryonated chicken eggs. Here we describe development and evaluation of a real-time quantitative reverse(More)
ABSTRACT An isometric virus ca. 25 nm in diameter with angular contour was isolated from onion plants showing yellow leaf striping and necrotic tips. The virus was mechanically transmitted onto 28 species of indicator plants belonging to five families, viz. Amaranthaceae, Chenopodiaceae, Cucurbitaceae, Leguminosae, and Solanaceae where it causes ring spots,(More)