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Transmission of Scab Resistance to Tetraploid Potato Via Unilateral Sexual Polyploidization

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Resistance to common scab continues to be a high priority trait for potato breeders. We have identified a source of resistance in the diploid wild potato relative Solanum chacoense and… Click to show full abstract

Resistance to common scab continues to be a high priority trait for potato breeders. We have identified a source of resistance in the diploid wild potato relative Solanum chacoense and have introgressed it into cultivated potato by crossing it to a dihaploid. A clone generated by crossing two full-sib hybrids is highly resistant and produces both 2n pollen and 2n eggs. This clone, named 4–48, is homozygous for a major QTL for scab resistance derived from S. chacoense. Clone 4–48 was reciprocally crossed to three round white cultivars Megachip, Pike, and White Pearl. Common scab resistance was transferred to tetraploid offspring, with transmission through the male parent generally more effective than through the female parent. The majority of progeny (70%) exhibited stability for resistance to common scab across environments. This germplasm will be useful for breeding new resistant cultivars.ResumenLa resistencia a la roña común continúa siendo un carácter de alta prioridad para los mejoradores de papa. Hemos identificado una fuente de resistencia en la papa silvestre diploide Solanum chacoense, y la hemos incorporado a la papa cultivada mediante cruzamiento con un dihaploide. Un clon generado mediante la cruza de dos híbridos hermanos completos de progenie es altamente resistente y produce polen 2n y huevos 2n. Este clon, llamado 4–48, es homocigótico para un QTL mayor para resistencia a la roña derivado de S. chacoense. El clon 4–48 se cruzó recíprocamente a tres variedades redondas blancas, Megachip, Pike, y White Pearl. La resistencia a la roña común se transfirió a la descendencia tetraploide, con transmisión a través del padre, generalmente más efectivo que a través de la madre. La mayoría de la progenie (70%) exhibió estabilidad para la resistencia a la roña común a lo largo de los ambientes. Este germoplasma será útil para el mejoramiento de nuevas variedades resistentes.

Keywords: transmission; potato; para; resistance; scab resistance

Journal Title: American Journal of Potato Research
Year Published: 2017

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