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

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  • Susan A. Otieno

    (Potato Breeding and Genetics Michigan State University. Department of Plant, Soil, and Microbial Sciences 1066 Bogue St. East Lansing, MI 48824, USA Kenya Agricultural and Livestock Research Organization (KALRO) HRI, Tigoni 338, Limuru, Kenya)

  • Joseph Coombs

    (Potato Breeding and Genetics Michigan State University. Department of Plant, Soil, and Microbial Sciences 1066 Bogue St. East Lansing, MI 48824, USA)

  • David S. Douches

    (Potato Breeding and Genetics Michigan State University. Department of Plant, Soil, and Microbial Sciences 1066 Bogue St. East Lansing, MI 48824, USA)

Abstract

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

Suggested Citation

  • Susan A. Otieno & Joseph Coombs & David S. Douches, 2021. "Frequency of Polyploids of Solanum tuberosum Dihaploids in 2X × 2X Crosses," Journal of Agriculture and Crops, Academic Research Publishing Group, vol. 7(2), pages 76-80, 04-2021.
    • Handle: RePEc:arp:jacarp:2021:p:76-80
    DOI: 10.32861/jac.72.76.80
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