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Enzyme-linked immunosorbent assay with single or combined antisera for viruses S and X in potato tubers and plants

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Abstract

Enzyme-linked immunosorbent assay (ELISA), with single or combined antisera was effective for diagnosing potato virus S (PVS), potato virus X (PVX) or both viruses in plants grown in the greenhouse or field. In dormant tubers, stolon, middle and apical end composite sampling with or without eyes and sprouted tubers produced reliable positive assays for PVX. Only tuber pieces with sprouts resulted in consistently reliable assays for PVS. Composite sampling of potato foliage was effective for detecting one PVX infected plant in a total of 100 Kennebec, Norland, or Russet Burbank plants. There were some false negative results and greater variability in composite PVS assays, but on average, one PVS infected plant can be detected in composites of 10 Kennebec, Norland, or Russet Burbank plants. Sodium diethyldithiocarbamate (0.01M NaDIECA) in phosphate buffered saline + 0.5% Tween (PBS-T) added to plant extracts enhanced specific reactions for either virus. Onceor twiceused enzyme conjugate was effective in ELISA of either virus from potato foliage.

Resumen

Pruebas serólogicas de absorción y conjugados inmunoenzimáticos (ELISA) con antisueros sólos o combinados, fueron efectivos para diagnosticar los viruses S (PVS) y virus X de la papa (PVX), o ambos, tanto en plantas provenientes del campo, como del invernadero. En tubérculos dormantes, estolones, muestras compuestas de la parte apical y media, con o sin ojos, y tubérculos brotados, produjeron resultados positivos persistentes en pruebas para PVX. Sólo porciones de tubérculos con brotes dieron resultados positivos persistentes en pruebas para PVS. Muestras compuestas de hojas de papa fueron apropiadas para detectar una planta infectada con PVX en un total de 100 de Kennebec, Norland y Russet Burbank. Hubieron algunos resultados negativos falsos y con mayor variabilidad en pruebas compuestas para PVS, pero en promedio, una planta infectada con PVS puede ser detectada en muestras compuestas de 10 plantas de Kennebec, Norland y Russet Burbank. Dietilditiocarbamato de sodio (0.01M NaDIECA) en buffer fosfáto salino + 0.5% Tween (PBS-T) agregado a extractos de plantas estimularon las reacciones especificas para cada virus. Conjugados inmuno-enzimáticos usados una o dos veces fueron efectivos en ELISA para cada uno de los viruses usando hojas de papa.

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Minnesota Agricultural Experiment Station, St. Paul, MN 55108, Scientific Journal Series, Paper No. 11,846.

Former Research Assistant, Colorado State University, Fort Collins, CO, 80521.

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Banttari, E.E., Franc, G.D. Enzyme-linked immunosorbent assay with single or combined antisera for viruses S and X in potato tubers and plants. American Potato Journal 59, 375–387 (1982). https://doi.org/10.1007/BF02875356

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