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.
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