American Journal of Potato Research

, Volume 79, Issue 3, pp 155–165 | Cite as

Factors influencing PVY development and disease expression in three potato cultivars

  • Martin D. Draper
  • Julie S. Pasche
  • Neil C. GudmestadEmail author


Studies were performed to investigate factors affecting symptom expression of potato virus Y infection in three potato cultivars, Russet Norkotah, Shepody, and Red LaSoda. Quantitative enzyme-linked immunosorbent assay (ELISA) results revealed few differences in the relative virus titer among cultivars tested. Potato virus Y (PVY) titers developed as rapidly in Russet Norkotah as in Shepody and Red LaSoda. Additional studies were performed to determine the effect of light intensity and infections of PVY and potato virus X (PVX), alone and in combination, on the expression of mosaic symptoms in these three cultivars. Low light intensity (270-330 uE/m2/sec) significantly increased plant heights and severity of mosaic disease among the cultivars compared to high light intensity (100-200 uE/m2/sec). PVX and PVY, as well as the combination of PVX and PVY in the same plant, decreased plant height compared to the uninoculated (healthy) controls. Low light intensity and dual infections of PVX and PVY significantly increased mosaic disease severity in Shepody and Red LaSoda, but not in Russet Norkotah. Results of these studies refute the suggestion that Russet Norkotah is resistant to PVY infection since virus titers in this cultivar are similar to the known susceptible cultivars Shepody and Red LaSoda. These results further suggest that while Russet Norkotah is fully susceptible to infection by PVY, it resists symptom expression.

Additional Key Words

Potato virus Y Solanum tuberosum mosaic latent carrier 


Este estudio se realizó con el fin de investigar los factores que afectan la expresión de los síntomas del virus Y de la papa en tres cultivares, Russet Norkotah, Shepody y Red LaSoda. Los resultados del ensayo inmunoabsorbente ligado a la enzima cuantitativa (ELISA) revelaron algunas diferencias en el título relacionado del virus entre los cultivares examinados. El título del virus Y de la papa (PVY) se desarrolló rápidamente tanto en el cv. Russet Norkotah como en los cvs. Shepody y Red LaSoda. Se realizaron estudios adicionales para determinar los efectos de la intensidad de la luz y de las infecciones de PVY y del virus X (PVX), solos y en combinación, sobre la expresión de los síntomas del mosaico en esos tres cultivares. La baja intensidad de la luz (270–330 uE/m2/sec) incrementó significativamente la altura de la planta y la severidad de la enfermedad del mosaico entre los cultivares en comparación con la alta intensidad de la luz (100–200 uE/m2/sec). La presencia de PVX y PVY así como la combinación de ambos en la misma planta, redujo la altura de la planta en comparación con los controles no inoculados (sanos). La baja intensidad de la luz y la infección dual de PVX y PVY incrementaron significativamente la severidad de la enfermedad del mosaico en los cvs. Shepody y Red LaSoda, pero no en el cv. Russet Norkotah. Los resultados del estudio refutan la sugerencia de que Russet Norkotah es resistente a la infección del PVY, ya que el título del virus de este cultivar es similar a los cultivares de Shepody y Red Lasoda de susceptibilidad conocida. Estos resultados sugieren ampliamente que mientras el cv. Russet Norkotah es altamente susceptible a la infección por PVY, es resistente a la expresión de los síntomas.


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Copyright information

© Springer 2002

Authors and Affiliations

  • Martin D. Draper
    • 1
  • Julie S. Pasche
    • 2
  • Neil C. Gudmestad
    • 2
    Email author
  1. 1.Plant Science DepartmentSouth Dakota State UniversityBrookings
  2. 2.Department of Plant PathologyNorth Dakota State UniversityFargo

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