American Potato Journal

, Volume 60, Issue 6, pp 461–468 | Cite as

Effect of total light energy on symptoms and growth of ring rot-infected Red Pontiac potato plants

  • G. A. Nelson
  • G. C. Kozub


The effect of total light energy levels on development of bacterial ring rot symptoms caused byCorynebacterium sepedonicum (Spieck. and Kotth.) Skapt. and Burkh., and growth (plant height) of cv. Red Pontiac was investigated by growing inoculated and uninoculated rooted stem cuttings under different pre-inoculation and post-inoculation total light energy levels. Infected plants grown under a 45 mW cm−2 hr pre-inoculation total light energy level had a higher (P< 0.01) mean ring rot severity rating than plants grown under 103 mW cm−2 hr. Disease severity increased as the postinoculation total light energy decreased. Plants inoculated withC. sepedonicum showed little growth under a post-inoculation total light energy of 45 mW cm−2 hr, however, under 103 mW cm−2 hr; significantly greater growth occurred. Uninoculated plants grew more rapidly than infected plants under all pre-and post-inoculation total light energy level combinations, except those grown at pre-inoculation levels of 45 mW cm−2 hr.

Key Words

Ring rot bacteria ring rot symptoms total light energy levels growth of infected potatoes 


Se investigó el efecto de niveles de energía total de luz en el desarrollo de síntomas de pudrición anular bacteriana producidos porCorynebacterium sepedonicum (Speck. y Kotth.) Skapt. y Burkh., y en el crecimiento de la variedad Red Pontiac cultivando esquejes de tallo enraizados, inoculados y no inoculados, en diferentes niveles de energía total de luz antes y después de la inoculación. Plantas infectadas cultivadas en un nivel de energía total de luz de 45 mW cm−2 hr antes de la inoculación tenían más alto (P < 0.01) el grado de severidad promedio de pudrición anular que plantas cultivadas en 103 mW cm−2 hr. La severidad de la enfermedad incrementaba al reducirse la energía total de luz después de la inoculación. Plantas inoculadas conC. sepedonicum mostraron poco crecimiento en energía total de luz de 45 mW cm−2 hr después de la inoculación; sin embargo, hubo un crecimiento significativamente superior en 103 mW cm−2 hr. Plantas no inoculadas crecían más rápido que plantas infectadas en todas las combinaciones de niveles de energía total de luz antes y después de la inoculación, con excepción de las cultivadas en niveles de 45 mW cm−2 hr antes de la inoculación.


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Copyright information

© Springer 1983

Authors and Affiliations

  • G. A. Nelson
    • 1
  • G. C. Kozub
    • 1
  1. 1.Agriculture Canada Research StationLethbridgeCanada

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