Mapping oat diversity: how AAFC science is unlocking the crop’s genetic secrets

Oats are often celebrated as one of the most nutritious grains on the planet. From morning porridge and overnight oats to oat milk and cereals, this ancient crop has found a firm place in modern diets.

Yet for decades, oats have carried a scientific mystery. Unlike wheat, rice, or corn, the oat genome, which contains its full set of genetic instructions, has remained stubbornly difficult to unravel, due to genome complexity. That started to change in 2022, when the first oat genome sequences were published with contributions from AAFC. These early sequences showed that a single oat genome was not enough to capture the full natural diversity of oats. Scientists realized that a pangenome, a collection of genomes from both wild and cultivated varieties, was the key to solving this puzzle and unlocking benefits for farmers, consumers, and plant breeders.

Thanks to a groundbreaking international collaboration led in part by Agriculture and Agri-Food Canada, scientists from Canada, Australia, Finland, Germany, Poland, Spain, Sweden, Switzerland, the United Kingdom, and the United States worked together to decode the oat pangenome. As part of this effort, AAFC scientists Dr. Wubishet Bekele, Dr. Nicholas Tinker (retired), and their colleagues^{Footnote 1} conducted two studies that revealed an unprecedented level of detail about the oat genome. Published in the prestigious journals Nature and Nature Communications, these studies mark a turning point for oat research worldwide and place Canada firmly at the forefront of crop genomics. These achievements are the result of the longstanding global leadership of Canadian researchers, particularly in the areas of oat breeding and genomics, germplasm collection, cytogenetics, and taxonomy. A key example is the Plant Gene Resources of Canada (PGRC) genebank at the AAFC Saskatoon Research and Development Centre, which holds the world’s largest oat seed collection, containing 28 340 wild and cultivated oat accessions from around the globe. Many of the wild oat samples and accessions studied in the diversity analysis were sourced from this collection.

Cracking a complex code

The difficulty in sequencing oats lies in the complexity of its genome. Unlike humans, who have two sets of chromosomes (one from each parent), oats are hexaploid, meaning they carry 6 complete sets of chromosomes from 3 different ancestral forms. This makes its genome not only enormous but also layered with duplications and rearrangements that make it difficult to pin point how specific traits are controlled.

These studies revealed the full range of genetic diversity in cultivated and wild hexaploid oats. Using high-quality chromosome-level sequences, the team was able to catalogue which genes are shared and which are unique across different oat groups. Much of the data have been made available through interactive maps and tools, designed to help breeders choose parent plants (including wild relatives) and introduce new traits more effectively with greater precision to avoid side effects. Through the PanOat consortium, comprising more than 70 scientists across the globe, AAFC researchers helped sequence and analyze 33 oat lines, creating the first-ever fully-annotated oat pangenome, a master blueprint that captures both common and unique genes across oats.

Alongside the pangenome, researchers also built a pan-transcriptome, which acts as a map showing which genes are active in different tissues (such as leaves, roots, or seeds) at various stages of plant development. Together, these resources form a powerful toolkit for plant scientists, helping them link genetic differences to real-world traits like yield, disease resistance, and nutritional quality.

Canada’s leadership in the global effort

The pangenome compares 33 key oat varieties, but the next step is to broaden this knowledge to capture the full diversity of oats. Dr. Bekele, Dr. Tinker, and their AAFC colleagues^{Footnote 1} advanced this work in a companion study on oat origins and genome diversity. That study focused on 3 main goals:

• To understand how wild and cultivated oats are genetically structured;
• To understand how that structure reflects the crop’s adaptation to different environments; and
• To assess how well the assemblies in the pangenome cover the global oat diversity space.

In partnership with collaborators around the world, the AAFC team analyzed nearly 9,000 oat samples collected from international breeding programs as well as the PGRC genebank. Using a method called genotyping-by-sequencing, they compared genetic variation across this large collection with unprecedented precision.

Here are some of the key takeaways from their research:

• The study confirmed that the 33 pangenome varieties are highly representative of the complete global genomic diversity in hexaploid oat.
• The wild species Avena sterilis, which was long believed to be relatively uniform, actually consists of 4 distinct genetic populations, each linked to specific regions of the Mediterranean and Middle East.
• Two types of cultivated oats, Avena byzantina (red oats) and Avena sativa (common oats), turned out to be genetically distinct, confirming that these 2 lineages followed separate evolutionary paths.
• Certain regions of the oat genome carry structural rearrangements such as inversions (flipped sections of DNA) and translocations (segments moved to different chromosomes). These changes seem to have helped oats adjust to their local environments and may also have created natural barriers that make it harder for different oat types to cross and mix.
• AAFC breeding lines were used to demonstrate the impact of rearrangements on patterns of recombination (chromosome exchange between parents), demonstrating the effect of large-scale rearrangements on breeding progress.
• A high-resolution trait-to-gene association study linked two alleles of a gene in an inverted genomic region with flowering time, one of the key traits for adaptation and yield.
• A method called in silico karyotyping, that uses genotyping-by-sequencing markers to map chromosome structures, was developed. Unlike traditional karyotyping, which is time-consuming and technical, this approach can also detect inversions, which are often missed.

Why this research matters for Canadians

At first glance, cataloging the oat genes might seem like an academic exercise. But the implications are far-reaching for farmers and consumers in Canada.

For plant breeders, the pangenome and genetic diversity study unlocks a new toolbox that will complement and enhance the AAFC team’s current use of genomic tools in oat breeding. Instead of working with limited or incomplete knowledge, breeders can now use the information to effectively introduce new traits from wild relatives or cultivated oat lines. Since one of the assembled lines can be genetically engineered, researchers can use it to help pinpoint which genes are tied to important traits. These traits include yield potential, which helps oats stay competitive with other cereal crops. They also include disease resistance, which protects against rusts and other common plant pathogens. Another focus is nutritional quality, with particular attention to boosting beta-glucan, a soluble fibre that lowers cholesterol. Finally, researchers are working on climate resilience, developing oat varieties that can thrive under moisture stress, heat, cold, or other challenging growing conditions.

For farmers, this means the possibility of hardier, more reliable oat crops that perform well across Canada’s diverse agricultural landscape. For consumers, it means continued access to healthy, sustainable oat products, ranging from traditional foods to innovative alternatives like oat-based dairy replacements.

For Canada’s agriculture sector as a whole, this research reinforces the country’s position as a leader in both science and oat production. Canada is already one of the world’s top oat exporters, supplying markets in the United States, Europe, and beyond. Unlocking new genetic potential will ensure that Canadian oats remain the most sought-after for years to come.

Looking to the future

With the pangenome and diversity map now available, researchers have a better foundation for future studies. Already, breeders are exploring how to use this genetic knowledge to create next-generation oat varieties.

AAFC scientists are particularly interested in traits that support sustainability and climate adaptation as Canadian agriculture faces new challenges from shifting weather patterns. By identifying genes linked to stress tolerance or efficient nutrient use, breeders may be able to develop oat lines that require fewer inputs while maintaining strong yields. There is also growing interest in oats’ role as a functional food, and, with rising consumer demand for heart-healthy and plant-based diets, the ability to fine-tune nutritional traits like fibre or protein content could open new markets and opportunities for Canadian farmers.

In Canada, oats are an $8 billion industry recognized worldwide for their superior quality. This research reinforces Canada’s position as a leader in both science and oat production, and by unlocking new genetic potential it will help ensure that Canadian oats continue to supply markets in the United States, Europe, and beyond, while remaining a global favourite for years to come.

Photo gallery

AAFC scientist helped conduct two studies that revealed an unprecedented level of detail about the oat genome, forming a powerful toolkit for plant scientist.

AAFC scientist collaborated with international partners on this oat research to unlock benefits for farmers, consumers, and plant breeders.

Related information

• Nature Communications: Bekele, W.A., Avni, R., Birkett, C.L., Itaya, A., Wight, C. P., et al. Global genomic population structure of wild and cultivated oat reveals signatures of chromosome rearrangements. Nature Communications 16, 9486 (2025). https://www.doi.org/10.1038/s41467-025-57895-3.
• Nature: Avni, R., Kamal, N., Bitz, L., Jellen, E.N., Bekele, W.A., et al. A pangenome and pantranscriptome of hexaploid oat. Nature (2025). https://www.nature.com/articles/s41586-025-09676-7