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In European regions of cold climate,  S. uvarum  can replace  S. cerevisiae  in wine fermentations performed at low temperatures.  S. uvarum  is a cryotolerant yeast that produces more glycerol, less acetic acid and exhibits a better aroma profile. However, this species exhibits a poor ethanol tolerance compared with  S. cerevisiae . In the present study, we obtained by rare mating (non-GMO strategy), and a subsequent sporulation, an interspecific  S. cerevisiae  ×  S. uvarum  spore-derivative hybrid that improves or maintains a combination of parental traits of interest for the wine industry, such as good fermentation performance, increased ethanol tolerance, and high glycerol and aroma productions. Genomic sequencing analysis showed that the artificial spore-derivative hybrid is an allotriploid, which is very common among natural hybrids. Its genome contains one genome copy from the  S. uvarum  parental genome and two heterozygous copies of the  S. cerevisiae  parental genome, with the exception of a monosomic  S. cerevisiae  chromosome III, where the sex-determining  MAT  locus is located. This genome constitution supports that the original hybrid from which the spore was obtained likely originated by a rare-mating event between a mating-competent  S. cerevisiae  diploid cell and either a diploid or a haploid  S. uvarum  cell of the opposite mating type. Moreover, a comparative transcriptomic analysis reveals that each spore-derivative hybrid subgenome is regulating different processes during the fermentation, in which each parental species has demonstrated to be more efficient. Therefore, interactions between the two subgenomes in the spore-derivative hybrid improve those differential species-specific adaptations to the wine fermentation environments, already present in the parental species.

frontiers in bioengineering and biotechnology

Differential Contribution of the Parental Genomes to a S. cerevisiae × S. uvarum Hybrid, Inferred by Phenomic, Genomic, and Transcriptomic Analyses, at Different Industrial Stress Conditions