The yeast Saccharomyces cerevisiae has been used in human food and drink production for more than 9,000 years. Domesticated yeast strains, such as those used in wineries, have been known to be dispersed into the environment, but the exact mechanism for this spread was unknown, as was how yeast spend the winters in the wild, without ripe fruits to ferment. Birds and insects have previously been proposed as natural reservoirs for yeast, but yeast cells have been found to survive less than a day in bird guts, and insects often don't live long enough themselves to be effective winter homes. But new research reveals that the queens of social wasps do accommodate S. cerevisiae during the off season. These insects overwinter as adults and pass on the contents of their guts, including yeast cells, to their young during feeding in the spring.
The discovery was made after researchers isolated yeast ...
