Submitted to: Potato Association of America Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 2/25/2001
Publication Date: N/A
Citation: Interpretive Summary:
Technical Abstract: 'Atlantic' is the number one chipping potato variety grown in the mid-Atlantic states despite its susceptibility to internal heat necrosis. A lack of tetraploid germplasm genetically unrelated to 'Atlantic' with high specific gravity has hindered the breeding effort. The purpose of this study was to determine if a high specific gravity diploid population can contribute to this breeding effort. Twenty-six 4x-2x hybrids, 'Atlantic' and one breeding selection were evaluated in NC, VA and NJ in 1999 for specific gravity and incidence and severity of internal heat necrosis. Eleven of the 26 4x-2x hybrids were significantly higher in specific gravity and had significantly less internal heat necrosis than 'Atlantic', ten chipped acceptably. Two of the 4x-2x hybrids had significantly more internal heat necrosis than 'Atlantic'. Broad-sense heritability and a 95% confidence interval for specific gravity and incidence and severity of internal heat necrosis was estimated as 0.88 (0.78, 0.94), 0.91 (0.82, 0.95) and 0.89 (0.79, 0.94), respectively. These results indicate that the diploids have the potential to expand the genetic base for new varieties for the mid-Atlantic region.