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Sammanfattning

Fungal diseases represent a major challenge in spring barley production, affecting both yield and quality. Resistance to these pathogens is complex and quantitatively inherited, making it difficult to perform genetic dissection and selection. This study evaluated quantitative resistance to scald, powdery mildew, and net form net blotch (NFNB) using genome-wide approaches in diverse spring barley panels.

Genome-wide association study (GWAS) analyses identified several quantitative trait loci (QTL) associated with resistance to the targeted diseases, including both previously reported and novel loci. The number of detected QTL and their effects varied among diseases and populations, indicating the strong influence of genetic background on resistance architecture.

Population composition and genetic relatedness between the training and validation sets influenced genomic prediction accuracy. When these sets were closely related, marker effects were estimated more consistently, whereas prediction accuracy decreased when these populations were genetically distant. Although increasing the training population size improved prediction accuracy in some scenarios, the predictions were inconsistent and depended on the underlying genetic structure. Validation at different stages indicated limited transferability of genomic signals from seedling-stage to adult-plant resistance in field conditions.

These results indicate that both population composition and phenotyping context are key factors for detecting resistance loci and the performance of genomic prediction models. The results emphasise the need to account for genetic background and crop growth stage when applying genome-wide approaches to breeding for disease resistance in spring barley.

Nyckelord

barley; AUDPC; wMAS; GWAS; genomic prediction; scald; powdery mildew; net form net blotch; rrBLUP

Publicerad i

Acta Universitatis Agriculturae Sueciae
2026, nummer: 2026:35
Utgivare: Swedish University of Agricultural Sciences

SLU författare

UKÄ forskningsämne

Jordbruksvetenskap
Genetik och förädling inom lantbruksvetenskap

Publikationens identifierare

  • DOI: https://doi.org/10.54612/a.b30pi0ng71
  • ISBN: 978-91-8124-252-2
  • eISBN: 978-91-8124-282-9

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/146661