Teagasc Researchers Test 37 Heritage Barley Lines for Modern Markets

Thirty-seven winter barley breeding lines, preserved in Ireland's national seed bank, form the core of Teagasc-led research into whether heritage varieties can serve modern brewing, distilling and food markets.

The work matters because barley is Ireland's major cereal crop, grown in both spring and winter forms primarily for animal feed and beverage production. Beyond those traditional outlets, craft brewers, distillers and food producers are increasingly hunting for distinctive flavours and nutritional characteristics. Many of those qualities, the researchers believe, may lie dormant in older varieties developed during earlier breeding programmes.

What did the research involve?

The project had two strands: reconstructing historical breeding records and physically testing surviving grain.

Scientists assessed the agronomic and grain-quality traits of the 37 preserved winter barley lines, measuring:

• Protein content
• Beta-glucan levels (the soluble fibre that affects wort viscosity in brewing)
• Hagberg Falling Number (a standard test of grain quality and sprouting damage)

By rebuilding breeding records and adding genetic descriptors to the seed bank collection, the Teagasc work has significantly improved documentation of the historic Irish malting barley programme. That documentation gap mattered: until now, the story of how Irish breeding evolved existed only in fragments.

The research also demonstrated something practical for the industry — the capacity to process small batches of grain for experimental brewing and distilling. That capability is the bridge between a seed bank accession and a commercially testable product.

Why were these varieties dropped in the first place?

The need for genetic improvement in barley was recognised early in the development of modern plant breeding. For malting barley, breeders wanted specific traits:

• Low nitrogen levels
• Strong straw
• Disease resistance
• High yields
• Uniform grain size

In the late 19th century, Irish barley varieties often fell short of those ideals, which drove decades of subsequent breeding work. The 37 lines in the seed bank capture that history — the intermediate steps, not just the winners.

Can heritage lines compete with modern varieties?

Not on yield. The researchers are explicit that the historic lines may not match modern varieties in yield or processing performance. That's not the point.

The value is genetic. These lines represent a reservoir of distinctive traits that could prove useful in future breeding programmes or in specialised applications — a heritage-grain whisky, say, or a food product trading on provenance. Think of the seed bank as a parts catalogue rather than a showroom.

There's a broader lesson too. The work highlights the importance of preserving and documenting crop genetic resources, because the commercial case for a given accession can change as markets shift. Interest in heritage grains and distinctive brewing ingredients is growing, and varieties written off decades ago may yet find commercial roles in Ireland's brewing and distilling industries.

For now, the next stage to watch is whether any of the 37 lines graduates from small-batch experimental processing into a named commercial application — the step that would turn seed bank curiosity into a crop a grower could actually contract.