Contact: Chris Hittinger
University of Wisconsin-Madison
Caption: Patagonian galls such as these harbor the cold-adapted yeast Saccharomyces eubayanus, a parent of the hybrid yeast used to make lager or cold-brewed beer. A field survey has confirmed that the parent yeast S. eubayanus, which somehow made its way to Bavaria 500 or so years ago, is easily isolated in Patagonia. A Wisconsin team recently isolated the yeast, although at low frequency, near Sheboygan, Wis. -- the first time it has been found in nature in North America.
Credit: Diego Libkind, Institute for Biodiversity and Environment Research, Bariloche, Argentina
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