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Potato virus Y in Seed Potatoes Sold at Garden Stores in Western Washington: Prevalence and Strain Composition

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Abstract

Between 2016 and 2018, a study was conducted to evaluate the prevalence and significance of Potato virus Y (PVY) present in seed potatoes distributed through garden stores in western Washington. Seed potatoes, particularly those exhibiting symptoms of cracking possibly caused by PVY, were purchased and grown-out in greenhouse tests. A relatively high incidence (47% in 2016; 26% in 2017; 29% in 2018) of the collections (15, 31, and 49 seed lots in total, respectively) produced plants that were confirmed by ELISA to be infected with PVY. Seed sold for organic production yielded approximately ten times more PVY infections than seed sold for conventional production. Strain typing revealed infections primarily by PVYO, PVYNTN, and PVYN-Wi. Mixed infections of PVYO/NTN and PVYO/N-Wi were detected a few times and no new or unusual PVY strains were found. These PVY strain types often were recovered from plants originating from cracked seed tubers, and the incidence of PVYN-Wi from cracked tubers increased (22% to 69%) during the study. PVYN-Wi remains an important constituent of the region’s PVY strain composition since its first detection in 2011. Garden enthusiasts and organic potato growers need more information about PVY to help mitigate the risk that PVY infected seed tubers could pose to commercial potato production fields.

Resumen

Entre 2016 y 2018, se condujo un estudio para evaluar la prevalencia y significancia del virus Y de la papa (PVY) presente en la semilla de papa, distribuido en tiendas de jardinería en el oeste de Washington. Las semillas de papa, particularmente aquellas exhibiendo síntomas de cuarteaduras posiblemente causadas por el PVY, se compraron y cultivaron en pruebas de invernadero. Una incidencia relativamente alta (47% en 2016; 26% en 2017; 29% en 2018) de las colecciones (15, 31, y 49 lotes de semilla en total, respectivamente) produjeron plantas a las que se les confirmó por ELISA que estaban infectadas con PVY. La semilla vendida para producción orgánica tuvo una incidencia aproximada de diez veces más de infecciones de PVY, que la semilla vendida para producción convencional. La caracterización de las variantes reveló infecciones primeramente por PVYO, PVYNTN, y PVYN-Wi. Se detectaron infecciones mixtas de PVYO/NTN y PVYO/N-Wi varias veces y no se encontraron variantes nuevas o inusuales. Todos estos tipos de variantes de PVY se recuperaron de plantas que se originaron de tubérculo-semilla con cuarteaduras, y la incidencia de PVYN-Wi de tubérculos con hendiduras aumentó (22% a 69%) durante el estudio. PVYN-Wi permanece como un constituyente importante de la composición regional de variantes de PVY desde su primera detección en 2011. Los entusiastas de la jardinería y los productores de papa orgánica, necesitan más información acerca del PVY para ayudar a mitigar el riesgo de que tubérculos-semilla infectados con PVY pudieran acceder a campos comerciales de producción de papa.

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Acknowledgements

This research was made possible by the Northwest Potato Research Consortium, WSDA Specialty Crop Block Grant Program, Project K1509; and, USDA-NIFA-Specialty Crops Research Initiative CAPS, Project 2014-07878.

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Correspondence to D. A. Inglis.

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Inglis, D.A., Gundersen, B., Beissinger, A. et al. Potato virus Y in Seed Potatoes Sold at Garden Stores in Western Washington: Prevalence and Strain Composition. Am. J. Potato Res. 96, 235–243 (2019). https://doi.org/10.1007/s12230-018-09695-3

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  • DOI: https://doi.org/10.1007/s12230-018-09695-3

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