Abstract
Resistance-breaking (RB) strains constitute a clade of biological and genetically distinct isolates of Citrus tristeza virus (CTV) that replicate and move systemically in Poncirus trifoliata (trifoliate orange), resistant to other known strains of CTV. Molecular markers have been developed by comparative genome analysis to allow quick identification of potential RB isolates. Here, methods are described to identify and characterize RB strains by reverse transcription-polymerase chain reaction (RT-PCR), quantitative real-time RT-PCR (RT-qPCR), full-length genome sequencing, and biological indexing.
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