Population genomics of Mediterranean oat (A. sativa) reveals high genetic diversity and three loci for heading date

Francisco J. Canales, Gracia Montilla-Bascón, Wubishet Abebe Bekele, Catherine Howarth, Tim Langdon, Nicolas Rispail, Nicholas A. Tinker, Elena Prats

Research output: Contribution to journalArticlepeer-review

7 Citations (SciVal)
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Abstract

Key message: Genomic analysis of Mediterranean oats reveals high genetic diversity and three loci for adaptation to this environment. This information together with phenotyping and passport data, gathered in an interactive map, will be a vital resource for oat genetic improvement. Abstract: During the twentieth century, oat landraces have increasingly been replaced by modern cultivars, resulting in loss of genetic diversity. However, landraces have considerable potential to improve disease and abiotic stress tolerance and may outperform cultivars under low input systems. In this work, we assembled a panel of 669 oat landraces from Mediterranean rim and 40 cultivated oat varieties and performed the first large-scale population genetic analysis of both red and white oat types of Mediterranean origin. We created a public database associated with an interactive map to visualize information for each accession. The oat collection was genotyped with 17,288 single-nucleotide polymorphism (SNP) loci to evaluate population structure and linkage disequilibrium (LD); to perform a genome-wide association study (GWAs) for heading date, a key character closely correlated with performance in this drought-prone area. Population genetic analysis using both structure and PCA distinguished two main groups composed of the red and white oats, respectively. The white oat group was further divided into two subgroups. LD decay was slower within white lines in linkage groups Mrg01, 02, 04, 12, 13, 15, 23, 33, whereas it was slower within red lines in Mrg03, 05, 06, 11, 21, 24, and 28. Association analysis showed several significant markers associated with heading date on linkage group Mrg13 in white oats and on Mrg01 and Mrg08 in red oats.
Original languageEnglish
Pages (from-to)2063-2077
Number of pages15
JournalTheoretical and Applied Genetics
Volume134
Issue number7
Early online date26 Mar 2021
DOIs
Publication statusPublished - 01 Jul 2021

Keywords

  • Avena/genetics
  • Genetic Association Studies
  • Genetic Linkage
  • Genetic Markers
  • Genetics, Population
  • Genotype
  • Haplotypes
  • Linkage Disequilibrium
  • Mediterranean Region
  • Polymorphism, Single Nucleotide
  • Seeds/growth & development

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