Since these b-glucosidases are absent in most S. cerevisiae starter culture strains, we have functionally expressed the
b-glucosidase gene (BGL1) of the yeast Saccharomycopsis fibuligera in S. cerevisiae [166].When the b-1,4-glucanase gene from Trichoderma longibrachiatum was
expressed in wine yeast the aroma intensity of wine increased, presumably due to the hydrolysis of glycosylated ¯avour precursors [115].