SUMMARYA novel, unbiased approach to plant viral disease diagnosis has been developed which requires no a priori knowledge of the host or pathogen. Next-generation sequencing coupled with metagenomic analysis was used to produce large quantities of cDNA sequence in a model system of tomato infected with Pepino mosaic virus . The method was then applied to a sample of Gomphrena globosa infected with an unknown pathogen originally isolated from the flowering plant Liatris spicata . This plant was found to contain a new cucumovirus, for which we suggest the name 'Gayfeather mild mottle virus'. In both cases, the full viral genome was sequenced. This method expedites the entire process of novel virus discovery, identification, viral genome sequencing and, subsequently, the development of more routine assays for new viral pathogens.
Arabis mosaic virus (ArMV) is pathogenic to a wide variety of plant species including ornamentals. Using the methods of test-plants, electron microscopy, and DAS-ELISA, ArMV was identified in ornamental plant species of the genera Arum L., Camassia Lindl., Crocus L., Dahlia Cav., Dicentra Bernh., Dieffenbachia sp., eryngium L., Liatris Gaertn. Ex Schreb., Lychnis L., Muscari Mill., Iris L. and Phlox L., representing eight families. In naturally infected host plants, the virus was found in mixed infections with other viruses. Virus idenstity in five ornamental species was confirmed by RT-PCR.
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