American Journal of Potato Research

, Volume 78, Issue 1, pp 9–17 | Cite as

Partial resistance toPhytophthora infestans in fourSolanum crosses

  • A. E. Dorrance
  • D. A. Inglis
  • J. P. Helgeson
  • C. R. Brown


Thirty progeny from each of fourSolanum crosses were evaluated in the field at Mount Vernon, WA, in 1996 and 1997 for partial resistance toPhytophthora infestans. Of the four parents, three have high levels of partial resistance toP. infestans; one derived from somatic hybridization ofS. bulbocastanum, the other two from traditional breeding efforts for multiple disease resistance. Data were collected from each cross to estimate area under the disease progress curve (AUDPC), days to 5% disease severity threshold (DT5), and sporangia production (SP). All of these variables differed significantly among the progeny within each cross in each year. Correlation analysis indicated that DT5 was highly correlated with AUDPC for all four populations for both years. Log-transformed SP was significantly (P>0.001) correlated to AUDPC values for one population in both years, but the significance of the correlation was variable between years for the remaining three crosses. The variable DT5, which is composed of three components (infection efficiency, latent period, and lesion growth rate), was the most important in identifying progeny with partial resistance to late blight in all four crosses in this study.

Additional key words

General resistance potato potato 

Area under the disease progress curve


days to 5% disease severity threshold


sporangia production


Treinta progenies de cada uno de los cuatro cruzamientos deSolanum fueron evaluadas en los campos de Mount Vernon, WA en 1996 y 1997, para comprobar su resistencia parcial aPhytophthora infestans. De los cuatro progenitores, tres muestran altos niveles de resistencia parcial aP. infestans; uno, derivado de la hibridación somática deS. bulbocastanu; los otros dos, producto de esfuerzos tradicionales de mejoramiento para conferir resistencia a múltiples enfermedades. Los datos fueron recolectados de cada cruce, con el fin de estimar la curva de progreso de la enfermedad (AUDPC por sus siglas en inglés), los días al 5% de inicio severo de la enfermedad (DT5) y la producción de esporangio (PE). Todas estas variables fueron significativamente diferentes entre la progenie de cada cruce, cada año. Los análisis correlativos indicaron que DT5 fue la correlación más alta con AUDPC para las cuatro poblaciones en ambos años. El registre transformado de PE fue significativamente (P⩽0.001) correlativo con los valores de la AUDPC para una población en los dos años, pero el significado de la correlación fue variable entre años para los tres cruces restantes. La variable DT5 -que consta de tres componentes (eficacia de la infección, período de latencia y tasa de crecimiento de la lesión)- fue la más importante para identificar las progenies con resistencia parcial al tizón tardío en los cuatro cruces de este estudio.


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Copyright information

© Springer 2001

Authors and Affiliations

  • A. E. Dorrance
    • 1
  • D. A. Inglis
    • 2
  • J. P. Helgeson
    • 3
  • C. R. Brown
    • 4
  1. 1.OARDCThe Ohio State UniversityWooster
  2. 2.Washington State University-Mount Vernon REUMount Vernon
  3. 3.USDA/ARS, Department of Plant PathologyUniversity of WisconsinMadison
  4. 4.USDA/ARSIAEECProsser

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