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Resistance to phytophthora erythroseptica and pythium ultimum in a potato clone derived from s. berthaultii and s. etuberosum

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Abstract

Tubers of several potato clones and cultivars were screened for susceptibility to infection by zoospores of Phytophthora erythroseptica (causal agent of pink rot) and mycelia of Pythium ultimum (causal agent of leak) over a three-year period, from 2003-2005. Incidence of infected tubers (%) and penetration of rot (mm) were the parameters used to determine the susceptibility of each potato clone. Responses of each potato clone were compared to cultivars with known resistance or susceptibility to these pathogens. Tubers of cultivars Atlantic and Snowden have moderate resistance to infection and colonization by P. erythroseptica and P. ultimum, respectively, and were used as the resistant checks. Cultivars Russet Norkotah and Red Norland are susceptible to infection by both pathogens. A number of potato clones demonstrated resistance to pink rot equal to or greater than the control cultivar Atlantic, including Etb 6-5-2, ND5822C-7, ND6956b-13, ND7443Ab-44, ND7443Ab-181, ND7818-1Y and J101K6A22. In addition to demonstrating the highest resistance to pink rot, Etb 6-5-2 was the only clone that demonstrated resistance to leak greater than or equivalent to the resistant cultivar Snowden. Etb 6-5-2 is a backcross derivative from a somatic hybrid of Solanum etuberosum and Solanum berthaultii and will be investigated further as a potential source of resistance to these two storage rot diseases.

Resumen

Los tubérculos de varios clones y cultivares de papa fueron tamizados para susceptibilidad con zoosporas de Phytopthora erythroseptica (agente causal de pudricion rosada) y con micelio Pythium ultimum (agente causal de pudricion acuosa o gotera) en un periodo de tres aÑos, del 2003 al 2005. La incidencia de tubérculos infectados (%) y la profundidad de la pudriciön (mm) fueron los parámetros usados para determinar la susceptibilidad en cada clon de papa. Las respuestas de cada clon fueron comparadas con las de cultivares de conocida resistencia o susceptibilidad a estos patögenos. Tubérculos de los cultivares Atlantic y Snowden que tienen resistencia moderada a la infecciön y colonizacion por P. erythroseptica y P. ultimum respectivamente, fueron usados como testigo resistente. Los cultivares de Russet Norkotah y Red Norland son susceptibles a la infeccion de ambos patögenos. Varios clones de papa mostraron resistencia a la pudriciön rosada, igual o mayor que el testigo Atlantic, incluyendo, Etb 6-5-2, ND5822C-7, ND6956b-13, ND7443Ab-44, ND7443Ab-181, ND7818-1Y y J101K6A22. Además de demostrar muy alta resistencia, Etb 6-5-2 fue el único clon que demoströ resistencia a la gotera en mayor proporciön o equivalente al cultivar resistente Snowden. Etb 6-5-2 es producto de una retrocruza derivada de un híbrido somático de Solanum etuberosum y S. berthaultii y será investigada adicionalmente como fuente potencial de resistencia a estas dos pudriciones de tubérculos almacenados.

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Correspondence to Neil C. Gudmestad.

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Thompson, A.L., Taylor, R.J., Pasche, J.S. et al. Resistance to phytophthora erythroseptica and pythium ultimum in a potato clone derived from s. berthaultii and s. etuberosum. Amer J of Potato Res 84, 149–160 (2007). https://doi.org/10.1007/BF02987138

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