03065naa a2200301 a 450000100080000000500110000800800410001902200390006002400350009910000140013424501200014826000090026850005470027752016320082465000110245665300240246765300320249165300200252365300180254365300260256170000190258770000200260670000210262670000140264770000150266170000140267677300730269010593432019-08-26       2019    bl uuuu     u00u1 u    #d  a1125-4653 // Online ISSN 2239-72647 a10.1007/s42161-018-0149-02DOI1 aRUBIO, L.  aBiological and molecular characterization of Uruguayan citrus tristeza virus field isolates.h[electronic resource]  c2019  aArticle history: Received 06 June 2018 //  Accepted 29 July 2018 //  First Online 13 August 2018 // Published 15 February 2019. Acknowledgements: This research was funded by Instituto Nacional de Investigación Agropecuaria, Uruguay (project CT-06), through the National Program of Citrus, in collaboration with the Laboratorio de Virología Molecular, Centro Universitario Regional Litoral Norte de la Universidad de la República. Funding: This study was funded by Instituto Nacional de Investigación Agropecuaria, Uruguay (project CT-06).  aABSTRACT. Citrus tristeza virus (CTV) is the causal agent of the most important viral disease of citrus. Symptoms that may affect the productive potential of citrus plants are observed in Uruguayan orchards even though resistant rootstocks are used. CTVis fully eliminated in propagative materials by the National Sanitation and Certification Program, but since the virus and its vector are widespread in the country, the risk of infection in the field persists. In this situation, using mild CTV strains in a cross-protection program would be a useful alternative to attempt to increase yield and quality of the local citrus industry. To this aim, this study assessed the biological and molecular characteristics of 32 local CTV isolates. Bioassays were conducted in a greenhouse with controlled conditions. Each isolate was graft-inoculated on Mexican lime, sweet orange, sour orange and Duncan grapefruit indicator plants. Symptoms and their intensity were evaluated. Molecular characterization was carried out by RT-PCR amplification, using primers for the p25, p20 and p23 genes. PCR products were sequenced, nucleotide sequences were aligned with international reference strains and phylogenetic trees were constructed. Results of the biological and molecular analysis showed the prevalence of severe CTV isolates with a high genetic variability. Two out of 32 characterized isolates were selected as mild CTV isolates to be tested as candidates for future cross-protection experiments. The survey showed a complex scenario for the management of CTV in Uruguay. © Società Italiana di Patologia Vegetale (S.I.Pa.V.) 2018  aCITRUS  aBIOLOGICAL INDEXING  aCITRUS TRISTEZA VIRUS (CTV)  aCLOSTEROVIRIDAE  aCLOSTEROVIRUS  aPHYLOGENETIC ANALYSIS1 aHERNÁNDEZ, L.1 aBENÍTEZ, M. J.1 aARRUABARRENA, A.1 aRIVAS, F.1 aCOLINA, R.1 aMAESO, D.  tJournal of Plant Pathology, 2019, volume 101, Issue 1, pages 97-105.