Comparative analyses identify the contributions of exotic donors to disease resistance in a barley experimental population

Zhou Fang, Amber Eule-Nashoba, Carol Powers, Thomas Y. Kono, Shohei Takuno, Peter L. Morrell, Kevin P. Smith

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Introgression of novel genetic variation into breeding populations is frequently required to facilitate response to new abiotic or biotic pressure. This is particularly true for the introduction of host pathogen resistance in plant breeding. However, the number and genomic location of loci contributed by donor parents are often unknown, complicating efforts to recover desired agronomic phenotypes. We examined allele frequency differentiation in an experimental barley breeding population subject to introgression and subsequent selection for Fusarium head blight resistance. Allele frequency differentiation between the experimental population and the base population identified three primary genomic regions putatively subject to selection for resistance. All three genomic regions have been previously identified by quantitative trait locus (QTL) and association mapping. Based on the degree of identity-by-state relative to donor parents, putative donors of resistance alleles were also identified. The successful application of comparative population genetic approaches in this barley breeding experiment suggests that the approach could be applied to other breeding populations that have undergone defined breeding and selection histories, with the potential to provide valuable information for genetic improvement.

Original languageEnglish (US)
Pages (from-to)1945-1953
Number of pages9
JournalG3: Genes, Genomes, Genetics
Volume3
Issue number11
DOIs
StatePublished - Nov 2013

Keywords

  • Allele frequency
  • Breeding
  • Disease
  • Identity-by-state
  • Introgression
  • Resistance

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