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Sequence diversity of the nucleoprotein gene of iris yellow spot virus (genus Tospovirus, family Bunyaviridae) isolates from the western region of the United States

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Summary.

Iris yellow spot virus (IYSV), a tentative virus species in the genus Tospovirus and family Bunyaviridae, is considered a rapidly emerging threat to onion production in the western United States (US). The present study was undertaken to determine the sequence diversity of IYSV isolates from infected onion plants grown in California, Colorado, Idaho, Oregon, Utah and Washington. Using primers derived from the small RNA of IYSV, the complete sequence of the nucleoprotein (NP) gene of each isolate was determined and the sequences compared. In addition, a shallot isolate of IYSV from Washington was included in the study. The US isolates of IYSV shared a high degree of sequence identity (95 to 99%) with one another and to previously reported isolates. Phylogenetic analyses showed that with the exception of one isolate from central Oregon and one isolate from California, all the onion and shallot isolates from the western US clustered together. This cluster also included onion and lisianthus isolates from Japan. A second distinct cluster consisted of isolates from Australia (onion), Brazil (onion), Israel (lisianthus), Japan (alstroemeria), the Netherlands (iris) and Slovenia (leek). The IYSV isolates evaluated in this study appear to represent two distinct groups, one of which largely represents isolates from the western US. Understanding of the population structure of IYSV would potentially provide insights into the molecular epidemiology of this virus.

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Authors and Affiliations

  1. Department of Plant Pathology, Washington State University [WSU], Pullman, WA, USA

    H. R. Pappu

  2. WSU, Northwestern Washington Research & Extension Center, Mount Vernon, WA, USA

    L. J. du Toit

  3. Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO, USA

    H. F. Schwartz

  4. Department of Plant, Soil and Entomological Sciences, University of Idaho, Parma, ID, USA

    S. K. Mohan

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  1. H. R. Pappu
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  2. L. J. du Toit
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  3. H. F. Schwartz
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  4. S. K. Mohan
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Pappu, H., du Toit, L., Schwartz, H. et al. Sequence diversity of the nucleoprotein gene of iris yellow spot virus (genus Tospovirus, family Bunyaviridae) isolates from the western region of the United States. Arch Virol 151, 1015–1025 (2006). https://doi.org/10.1007/s00705-005-0681-z

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  • DOI: https://doi.org/10.1007/s00705-005-0681-z

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