Abstract
One-step RT-qPCR TaqMan assays have been developed for six plant viruses with considerable economic impact in the growing of tulip and lily bulbs: lily mottle virus, lily symptomless virus, lily virus X, Plantago asiatica mosaic virus, tulip breaking virus and tulip virus X. To enhance efficacy and cost-efficiency these assays were combined into multiplex panels. Four different multiplex panels were designed, each consisting of three virus assays and an adapted assay for the housekeeping gene nad5 of lilies and tulips, that acts as an internal amplification control. To eliminate false negative results due to variation in the viral genome sequences, for each target virus two assays were developed on distinct conserved genomic regions. Specificity, PCR efficiency and compatibility of primers and probes were tested using gBlock constructions. Diagnostic samples were used to evaluate the strategy. High Throughput Sequencing of a set of the diagnostic samples, further verified the presence or absence of the viruses in the RNA samples and sequence variations in the target genes. This interchangeable multiplex panel strategy may be a valuable tool for the detection of viruses in certification, surveys and virus diagnostics.
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