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Examination of the experimental host range of Plantago asiatica mosaic virus

John Hammond: USDA-ARS, USNA, Floral and Nursery Plant Research Laboratory

<div>Plantago asiatica mosaic virus (PlAMV) has been detected in lily (<em>Lilium</em> species and hybrids) in multiple countries following dissemination in the international bulb trade. PlAMV is known to be transmitted between lily plants in the soil, without any known vector, and has been identified in a number of other herbaceous species and the woody shrub <em>Nandina domestica</em> (nandina, heavenly bamboo). The potential for establishment of PlAMV in soil in which PlAMV-infected plants have been grown is of concern, and information regarding the experimental host range is therefore needed. Inoculation of a lily isolate of PlAMV to a wide range of plants from taxonomically diverse plant families, including various crop plants, ornamentals, bioassay plants, and weeds, was therefore carried out; infection was assessed by symptom expression, and by double antibody sandwich ELISA using an antiserum raised against the lily isolate. More than 25 plant species representing at least 15 diverse plant families were demonstrated to be experimental hosts, in addition to known natural hosts in four additional families, and in five families from which experimental hosts were also identified. PlAMV was therefore demonstrated to have a broad host range among diverse plant families. Although several experimental hosts were infected only locally, others were systemically infected, either latently or with obvious symptoms, suggesting the risk of establishment of PlAMV where infected crops are grown.</div>