Frequency of Polyploids of Solanum tuberosum Dihaploids in 2X × 2X Crosses

When breeding diploid potatoes, tetraploid progeny can result from the union of 2n eggs and pollen in 2x-2x crosses. Thirty-three crosses were made to examine frequency All between S. tuberosum dihaploids self-compatible donors, M6 DRH S6-10-4P17. Using chloroplast counting for ploidy determination, was as high 45% one 33 Based upon single nucleotide polymorphism (SNP) genotyping, attributed bilateral sexual polyploidization (BSP), which is caused by egg pollen. Dihaploids identified that produce lower frequencies eggs. The results this study suggest with a should be avoided 2x - programs.