Abstract
Both race-specific (RS) and race-non-specific (RNS) resistances exist in potato against the late blight pathogenPhytophthora infestans. Because these resistance types do not have the same epidemiological effects, their presence, alone or combined, in potato genotypes can be deduced from the analysis of disease progress curves from field experiments, a type of data commonly available to potato breeders, and their comparison with those of standard reference cultivars. The identification of RS resistance is based on the presence of a delay in epidemic onset compared to a susceptible cultivar, whereas the identification of RNS resistance is translated into a reduction of apparent infection rates. These parameters can be easily computed after linearization of the disease progress curves. This paper assesses the reliability of this identification using sets of experimental data, discusses its limitations, and highlights potential applications for breeding and cultivar assessment purposes.
Resumen
Dos tipos de resistencia—resistencia raza-específica (RS) y resistencia non-raza-específica (RNS)—existen en la papa contraPhytophthora infestans, el patógeno causando el tizón tardío. Ya que estos dos tipos de resistencia no tienen los mismos effectos epidemiológicos, su presencia, sueltas o combinadas, puede deducirse de la análisis de las curvas de desarollo de la enfermedad en campo, en conjunto con las de cultivos testigos. RS se puede identificar por la presencia de un retraso en la fecha de primer observacción de síntomas, cuando RNS se manifiesta por una reducción del rato apparente de infección. Ambos parámetros se pueden facilmente calcular después de linearizar las curvas de desarollo de la enfermedad. En el presente trabajo se evalua la capacidad de esta metodología a reconocer RS y RNS, sus limitaciones, y algunos usos possibles para la selección y evaluacción de nuevos cultivos.
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Andrivon, D., Pellé, R. & Ellissèche, D. Assessing resistance types and levels to epidemic diseases from the analysis of disease progress curves: Principles and application to potato late blight. Am. J. Pot Res 83, 455–461 (2006). https://doi.org/10.1007/BF02883506
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DOI: https://doi.org/10.1007/BF02883506