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- W4367834130 abstract "Raspberries (Rubus idaeus L.), occurring in the temperate zone of the northern hemisphere and blackberries (R. fruticosus L.), cultivated and growing all over the world, are plant species of the family Rosaceae. These species are susceptible to phytoplasma infections, which cause Rubus stunt disease. It spreads uncontrolled by vegetative propagation of plants (Linck and Reineke 2019a) and by phloem-sucking insect vectors, especially Macropsis fuscula (Hemiptera: Cicadellidae) (de Fluiter and van der Meer, 1953; Linck and Reineke 2019b). During a survey in commercial field in June 2021, over 200 raspberry bushes cv Enrosadira exhibiting typical symptoms of Rubus stunt were observed in Central Bohemia. Symptoms included dieback, leaf yellowing/reddening, stunted growth, severe phyllody and fruit malformations. Most diseased plants were growing in the edge rows of the field (about 80%). No symptomatic plants were observed in the middle of the field. Similar symptoms were observed in private gardens in South Bohemia on raspberry cv Rutrago and blackberry (unknown cultivar) in June 2018 and August 2022, respectively. DNA was extracted using the DNeasy Plant Mini Kit (Qiagen GmbH, Hilden, Germany) from flower stems and parts affected by phyllody of seven symptomatic plants as well as flower stems, leaf midribs, and petioles of five asymptomatic field plants. The DNA extracts were analyzed by a nested polymerase chain reaction assay using universal phytoplasma P1A/P7A primers followed by R16F2m/R1m and the group-specific R16(V)F1/R1 primers (Bertaccini et al. 2019). All samples from the symptomatic plants yielded an amplicon of expected size, while no product was amplified in asymptomatic plants. The P1A/P7A amplicons from three selected plants (two raspberries and one blackberry, each from different location) were cloned and bi-directionally Sanger sequenced (GenBank Accession Nos.OQ520100-2). The sequences spanned nearly full-length of 16S rRNA gene, 16S-23S rRNA intergenic spacer, tRNA-Ile gene, and a partial 23S rRNA gene. BLASTn search revealed the highest sequence identity (99.8-99.9%, query coverage 100%) to ‘Candidatus Phytoplasma rubi’ strain RS (GenBank Accession No. CP114006). To further characterize the ‘Ca. P. rubi’ strains, all these three samples were subjected to multigene sequence analysis. Sequences from a major portion of the tuf, rplV-rpsC, rpsH-rplR, uvrB-degV, and rplO-SecY-map genes (Acc. Nos. OQ506112-26) were obtained as described previously (Fránová et al. 2016). Comparison to GenBank sequences confirmed their highest identity (99.6-100%, query coverage 100%) with ‘Ca. P. rubi’ RS strain, regardless of their geographic location and host (raspberry or blackberry). Recently, Bertaccini et al. (2022) suggested the 98,65 % ‘Ca. Phytoplasma’ strain identity threshold within 16Sr RNA sequences. In this survey, all three strains sequenced shared ≥99.73% sequence identity of the analysed 16S rRNA gene sequences and the high identity in the other genes with the reference ‘Ca. P. rubi’ RS strain. To our knowledge, this is the first report of Rubus stunt disease in the Czech Republic as well as the first molecular identification and characterization of ‘Ca. P. rubi’ from raspberry and blackberry in our country. As Rubus stunt disease is of great economic importance (Linck and Reineke 2019a), the pathogen detection and prompt removal of the diseased shrubs are essential to mitigating the spread and impact of the disease." @default.
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- W4367834130 date "2023-08-01" @default.
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- W4367834130 title "First Report of ‘<i>Candidatus</i> Phytoplasma rubi’ Associated with Rubus Stunt Disease of Raspberry and Blackberry in the Czech Republic" @default.
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- W4367834130 doi "https://doi.org/10.1094/pdis-03-23-0467-pdn" @default.
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