Whats on Tap?

20221101_225159.webp
20221101_225214.webp
 

Before Beer Became Lager, a Microbe Made a Mysterious Journey

Scientists found a relative of a parent of lager yeast in soil on an Irish university’s campus, which could help to track how it ended up in Bavaria.

As the story goes, a long time ago in Bavaria, beer underwent a transformation. Dark ale turned into a paler, gold-hued drink, and the beverage grew much more common around the time when a ducal edict restricted brewing to the winter months. The lager, as the new beer was called, had begun its journey to world domination.

Centuries on, geneticists have found that the yeast responsible for fermenting lagers is a hybrid of the traditional brewer’s yeast and another, cold-hardy yeast, Saccharomyces eubayanus. The lager yeast appears to be the result of a chance mating in a chilly brewery, where low temperatures allowed the hybrid to thrive.

But while brewer’s yeast is common enough, how the lager yeast’s other parent wound up in Bavaria has been harder to trace. It was first spotted in the wild in 2011, when biologists discovered the cold-loving yeast, S. eubayanus, living happily in the forests of Patagonia in South America. Then there were some tantalizing traces found in the Italian Alps, Tibet, western China and North Carolina.

So far, sightings in Europe have been almost nonexistent. But in a paper published Wednesday in the journal FEMS Yeast, biologists reported they had found S. eubayanus alive and well, living in the dirt of the University College Dublin campus in Ireland. The finding may provide a key clue about the microbe’s travels: If other samples are found across Europe, we may get a better picture of what led to that fortuitous meeting in a cold Bavarian cellar.
 
📱 Fish Smarter with the NYAngler App!
Launch Now

Fishing Reports

Latest articles

Back
Top