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Plant Disease 2007-Jul

Bidens mottle virus Identified in Tropical Soda Apple in Florida.

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C Baker
I Kamenova
R Raid
S Adkins

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Tropical soda apple (TSA) (Solanum viarum Dunal), a plant native to South America, was first identified in Florida in 1988 (4). It rapidly became a noxious weed in pastures throughout the state and it is known to be a reservoir for Cucumber mosaic virus, Potato leafroll virus, Potato virus Y (PVY), Tobacco etch virus (TEV), Tomato mosaic virus, and Tomato mottle virus, viruses that infect important vegetable crops in Florida (3). During a routine survey of Florida weeds during May of 2004, a TSA plant with chlorotic, young leaves found near Okeechobee, FL was determined to be infected with a potyvirus by using a commercially available enzyme linked immunosorbent assay kit (Agdia, Elkhart, IN). The results of a host range study indicated this potyvirus was neither PVY nor TEV. The virus caused local lesions in Chenopodium amaranticolor and systemic symptoms in C quinoa, Coreopsis sp. (C. A. Baker, unpublished), Helianthus annus, Nicotiana benthamiana, Petunia × hybrida, Verbena hybrida, and Zinnia elegans. It did not infect Gomphrena globosa, N. glutinosa, Pisum sativum, or Phaseolus vulgaris (1). Cylindrical inclusions consistent with those observed in plants infected with Bidens mottle virus (BiMoV) were observed in Z. elegans. Immunodiffusion tests with antiserum to BiMoV (Department of Plant Pathology, University of Florida) gave a reaction of identity with leaf extracts of the symptomatic zinnia, a known sample of BiMoV originally isolated from Bidens pilosa and a recent isolate of BiMoV from lettuce in Belle Glade, FL (C. A. Baker and R. Raid, unpublished). A partial polyprotein gene fragment (GenBank Accession No. EF467235) was amplified from total RNA of an inoculated C. quinoa plant by reverse transcription (RT)-PCR with previously described degenerate potyvirus primers (2). Analysis of the RT-PCR product sequence confirmed the host range results and indicated that the potyvirus infecting TSA was neither PVY nor TEV. However, the nucleotide and deduced amino acid sequences of a 247-bp portion of the RT-PCR product were 94 and 98% identical, respectively, with the coat protein sequence (GenBank Accession No. AF538686) of Sunflower chlorotic spot virus (SCSV). SCSV is a tentative potyvirus species described from Taiwan that is not yet recognized as an accepted species by the International Committee on Taxonomy of Viruses. On the basis of our concurrent host range, inclusion body, and serological data, it is likely that SCSV is in actuality the previously described and currently accepted potyvirus species BiMoV, for which no previous sequence data existed. As part of a comprehensive viral disease management plan, it is recommended that TSA plants growing in and around lettuce-production areas be controlled along with other weed hosts of this virus. References: (1) A. A. Brunt et al., eds. Plant Viruses Online: Descriptions and Lists from the VIDE Database. Version: 20 at http://biology.anu.edu.au/Groups/MES/vide/ , 1996. (2) A. Gibbs and A. J. Mackenzie. Virol. Methods 63:9, 1997. (3) R. J. McGovern et al. Int. J. Pest Manag. 40:270, 1994. (4) J. J. Mullahey et al. Weed Technol. 7:783, 1993.

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