<Emphasis Type="Italic">Citrus exocortis viroid</Emphasis> transmission through commercially-distributed seeds of <Emphasis Type="Italic">Impatiens</Emphasis> and <Emphasis Type="Italic">Verbena</Emphasis> plants |
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| Authors: | Rudra P Singh Andrea D Dilworth Xiaoping Ao Mathuresh Singh Virendra K Baranwal |
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| Institution: | (1) Potato Research Centre, Agriculture and Agri-Food Canada, 850 Lincoln Road, Fredericton, NB, Canada, E3B 4Z7;(2) Faculty of Horticulture and Landscape, Hunan Agricultural University, Changsha, Hunan Province, 410128, China;(3) Agricultural Certification Services, 1030 Lincoln Road, Fredericton, NB, Canada, E3B 8B7;(4) Plant Virology Unit, Division of Plant Pathology, Indian Agricultural Research Institute, New Delhi, 110012, India |
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| Abstract: | Surveys of Impatiens and Verbena species in local nurseries in Fredericton, Canada and Verbena species in New Delhi, India showed widespread infection of Citrus exocortis viroid (CEVd) in vegetatively-propagated and seed-grown plants. To determine viroid seed transmission, samples of eight varieties
of Impatiens and 11 varieties of Verbena were obtained from four commercial sources. All 19 samples collected contained viroid infection irrespective of variety.
The presence of viroid in non-germinated seed was 21%, while the transmission rate in seedlings was 66% in Impatiens walleriana in 2006. Following 2 years of seed storage, the respective figures were 6% and 26%. Similarly, in Verbena x hybrida the presence of viroid in seed was 13% in 2006 with a seed-transmission rate in seedlings of 28%, while the respective figures
after 2 years of storage were 5% and 45%. |
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| Keywords: | Ornamental plants Seed transmission Spread of viroids |
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