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Citrus tristeza virus replicates and forms infectious virions in protoplasts of resistant citrus relatives

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Abstract

Citrus tristeza virus (CTV) is the most economically important viral disease of citrus worldwide. Cultivars with improved CTV tolerance or resistance are needed to manage CTV-induced diseases. The citrus relatives Poncirus trifoliata (L.) Raf., Swinglea glutinosa (Blanco) Merr., and Severinia buxifolia (Poir) Ten. are potential sources of CTV resistance, but their resistance mechanisms are poorly characterized. As a first step to examine the mechanisms of resistance to CTV in these citrus relatives and selected Citrus × Poncirus hybrids, it was necessary to develop methods for protoplast isolation and viral inoculation to allow examination of CTV multiplication in this range of citrus varieties and relatives. Leaf and/or cultured cell protoplasts were isolated and inoculated with four biologically distinct CTV isolates. Northern-blot hybridization analyses for progeny RNAs and immuno-electron microscopy assays for newly produced virions showed that CTV replicated and produced infectious particles in protoplasts from all of the resistant plants tested. These results suggest that resistance to CTV observed at the plant level results from a lack of virus movement and/or some induced resistance response, rather than lack of viral multiplication at the cellular level.

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Authors and Affiliations

  1. Instituto Valenciano de Investigaciones Agrarias, Apartado Oficial, 46113 Moncada, Valencia, Spain

    Maria R. Albiach-Marti

  2. Citrus Research and Education Center, University of Florida, 700 Experiment Station Road, Lake Alfred, FL, 33850, USA

    Jude W. Grosser, Siddarame Gowda, Tatineni Satyanarayana, Stephen M. Garnsey & William O. Dawson

  3. Virology Department, Volcani Center, Bet-Dagan, 50250, Israel

    Munir Mawassi

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  1. Maria R. Albiach-Marti
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  2. Jude W. Grosser
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  3. Siddarame Gowda
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  4. Munir Mawassi
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  5. Tatineni Satyanarayana
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  6. Stephen M. Garnsey
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  7. William O. Dawson
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Albiach-Marti, M.R., Grosser, J.W., Gowda, S. et al. Citrus tristeza virus replicates and forms infectious virions in protoplasts of resistant citrus relatives. Molecular Breeding 14, 117–128 (2004). https://doi.org/10.1023/B:MOLB.0000038000.51218.a7

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  • DOI: https://doi.org/10.1023/B:MOLB.0000038000.51218.a7

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