Genetic architecture is more complex for resistance to Septoria tritici blotch than to Fusarium head blight in Central European winter wheat

Vilson Mirdita, Guozheng Liu, Yusheng Zhao, Thomas Miedaner, C. Friedrich H. Longin, Manje Gowda, Michael Mette, Jochen C. Reif*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Fusarium head blight (FHB) and Septoria tritici blotch (STB) severely impair wheat production. With the aim to further elucidate the genetic architecture underlying FHB and STB resistance, we phenotyped 1604 European wheat hybrids and their 135 parental lines for FHB and STB disease severities and determined genotypes at 17,372 single-nucleotide polymorphic loci. Results: Cross-validated association mapping revealed the absence of large effect QTL for both traits. Genomic selection showed a three times higher prediction accuracy for FHB than STB disease severity for test sets largely unrelated to the training sets. Conclusions: Our findings suggest that the genetic architecture is less complex and, hence, can be more properly tackled to perform accurate prediction for FHB than STB disease severity. Consequently, FHB disease severity is an interesting model trait to fine-tune genomic selection models exploiting beyond relatedness also knowledge of the genetic architecture.

Original languageEnglish (US)
Article number430
JournalBMC genomics
Volume16
Issue number1
DOIs
StatePublished - Jun 5 2015

Keywords

  • Association mapping
  • Fusarium head blight
  • Genomic selection
  • Hybrid wheat
  • Septoria tritici blotch

ASJC Scopus subject areas

  • Biotechnology
  • Genetics

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