Discussion
The dynamics of micro-organisms in industrial fermentation affects the sensory quality and chemical composition of the produced wine. Controlling bacterial contamination
during fermentation with selected yeast is relatively
easy by using antibiotics or reducing the pH value. Such
control becomes difficult when contaminant microorganisms
are phylogenetically similar to the industrial
ones. When discussing the sensu stricto species, it must
be kept in mind that they may represent a special case in
yeast speciation, because these fermentation yeasts have
had the opportunity to replicate far more often than
groups not utilized in industrial fermentation (Vaughan-
Martini and Martini 1993). This is a group characterized
by a high fermentative ability and other physiological and
molecular similarities that suggest a close phylogenetic
relationship.