Genomic prediction of starch content and chipping quality in tetraploid potato using genotyping-by-sequencing
Author
Sverrisdóttir, ElsaByrne, Stephen
Sundmark, Ea Høegh Riis
Johnsen, Heidi Øllegaard
Kirk, Hanne Grethe
Asp, Torben
Janss, Luc
Nielsen, Kåre L.
Keyword
Geneticspotato
genomic selection
Breeding strategy
starch content
chipping quality
varietal development
Date
2017-07-13
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Sverrisdóttir, E., Byrne, S., Sundmark, E.H.R. et al. Genomic prediction of starch content and chipping quality in tetraploid potato using genotyping-by-sequencing. Theor Appl Genet 130, 2091–2108 (2017). https://doi.org/10.1007/s00122-017-2944-yAbstract
Genomic prediction models for starch content and chipping quality show promising results, suggesting that genomic selection is a feasible breeding strategy in tetraploid potato. Genomic selection uses genome-wide molecular markers to predict performance of individuals and allows selections in the absence of direct phenotyping. It is regarded as a useful tool to accelerate genetic gain in breeding programs, and is becoming increasingly viable for crops as genotyping costs continue to fall. In this study, we have generated genomic prediction models for starch content and chipping quality in tetraploid potato to facilitate varietal development. Chipping quality was evaluated as the colour of a potato chip after frying following cold induced sweetening. We used genotyping-by-sequencing to genotype 762 offspring, derived from a population generated from biparental crosses of 18 tetraploid parents. Additionally, 74 breeding clones were genotyped, representing a test panel for model validation. We generated genomic prediction models from 171,859 single-nucleotide polymorphisms to calculate genomic estimated breeding values. Cross-validated prediction correlations of 0.56 and 0.73 were obtained within the training population for starch content and chipping quality, respectively, while correlations were lower when predicting performance in the test panel, at 0.30-0.31 and 0.42-0.43, respectively. Predictions in the test panel were slightly improved when including representatives from the test panel in the training population but worsened when preceded by marker selection. Our results suggest that genomic prediction is feasible, however, the extremely high allelic diversity of tetraploid potato necessitates large training populations to efficiently capture the genetic diversity of elite potato germplasm and enable accurate prediction across the entire spectrum of elite potatoes. Nonetheless, our results demonstrate that GS is a promising breeding strategy for tetraploid potato.Funder
The Danish Council of Strategic Research; The Danish Council for Strategic ResearchGrant Number
12-132452; 11-116190ae974a485f413a2113503eed53cd6c53
https://doi.org/10.1007/s00122-017-2944-y
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