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Lady’s Slipper Orchid and Hydrangea: New Ornamental Hosts of Tobacco Rattle Virus (TRV) in Minnesota

M. M. Baumann, R. G. Kiambi, and B. E. Lockhart

January 2020


The lady’s slipper orchids are a subfamily encompassing over 160 species, including the state flower of Minnesota, Cypripedium reginae. Hydrangea is a genus of about 75 species of shrubs and trees that are popular in perennial gardens. Chlorotic and necrotic foliar symptoms were observed in lady’s slipper orchid and Hydrangea arborescens on plants in St. Paul, Minnesota. From partially purified extracts, virus particles resembling those of tobacco rattle virus (TRV) were observed. TRV-specific primers amplified products from both hydrangea and lady’s slipper and were then sequenced. The sequences matched published TRV sequences with 99% identity, confirming the presence of the virus. TRV has a broad host range including ornamental, vegetable, and weed hosts. This is the first report of TRV infection in both lady’s slipper and hydrangea in Minnesota and the United States.


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