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Title: Increasing genetic gain by reducing ploidy in potato

item Jansky, Shelley

Submitted to: National Association of Plant Breeders
Publication Type: Abstract Only
Publication Acceptance Date: 7/3/2017
Publication Date: 8/9/2017
Citation: Jansky, S.H. 2017. Increasing genetic gain by reducing ploidy in potato [abstract]. National Association of Plant Breeders. Paper No. 15.

Interpretive Summary:

Technical Abstract: While potato cultivars in major world production regions are tetraploid, wild and cultivated potatoes in the crop’s center of origin range from diploid to hexaploid. Landrace potato varieties cannot be distinguished based on ploidy. Contrary to popular belief, tetraploidy does not appear to be necessary for superior performance. The advantages of breeding diploid cultivars are significant and worthy of exploration. We are using naturally occurring dominant self-incompatibility inhibitor genes to allow us to self-pollinate diploid germplasm. In addition, we have access to pollinators that produce diploid haploids (dihaploids) from tetraploid clones via parthenogenesis. These germplasm resources are providing the foundation for our plan to develop hybrid potato cultivars from diploid inbred lines. We have generated recombinant inbred lines and are developing an introgression line population. In addition, we have begun hybridizing partially inbred dihaploids with partially to fully inbred germplasm to evaluate combining ability and heterosis.