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Genomic-led potato breeding

Selga, Catja (2021). Genomic-led potato breeding. Diss. (sammanfattning/summary) Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880
ISBN 978-91-7760-837-0
eISBN 978-91-7760-838-7
[Doctoral thesis]

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Abstract

Most cultivated potatoes (Solanum tuberosum L.) are polyploids with tetrasomic inheritance (2n = 4x = 48), which makes breeding for new improved cultivars more complicated compared to diploid crops. In addition to this, the potato market is much more fragmented compared to other staple crops such as maize or wheat, where yield and dry matter are by far the most important traits. A conventional potato breeder needs to consider a number of important breeding traits, including plant maturity, tuber and cooking quality, host plant resistance to pests and pathogens, and starch content. In the scope of this thesis, genomic-led breeding approaches for tetraploid potato are explored using high throughput genotypic data acquired from single nucleotide polymorphism (SNP) markers. Quantitative trait loci (QTL) for host plant resistance to Alternaria solani are mapped to chromosomes 5 and 11 using a segregating bi-parental crossing population. The application of genomic selection (GS) is tested in a potato breeding program situated in Sweden by predicting genomic estimated breeding values (GEBVs) for eight important breeding traits, such as tuber yield and quality, and host plant resistance to Phytophthora infestans. The predictive ability of GEBVs across clonal generations in the breeding program is poor for most breeding traits, however, the approach of predicting GEBVs within and across half-sib families results in higher predictive ability. Lastly, the genetic diversity of the potato germplasm at the Nordic Genetic Resource Centre (NordGen) is compared to newly bred clones in Sweden. These results suggest a close genetic relationship between the accessions from NordGen (local farmer’s cultivars and obsolete cultivars), and the modern breeding clones from the potato breeding program based in Sweden.

Authors/Creators:Selga, Catja
Title:Genomic-led potato breeding
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2021
Number:2021:80
Number of Pages:88
Publisher:Swedish University of Agricultural Sciences
ISBN for printed version:978-91-7760-837-0
ISBN for electronic version:978-91-7760-838-7
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Article category:Other scientific
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
Keywords:GEBV, genomic selection, linkage analysis, population structure potato breeding, QTL, tetraploid
URN:NBN:urn:nbn:se:slu:epsilon-p-114119
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-114119
ID Code:25994
Faculty:LTV - Fakulteten för landskapsarkitektur, trädgårds- och växtproduktionsvetenskap
Department:(LTJ, LTV) > Department of Plant Breeding (from 130101)
Deposited By: SLUpub Connector
Deposited On:01 Nov 2021 08:26
Metadata Last Modified:01 Nov 2021 08:31

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