Article

Antonie van Leeuwenhoek

, Volume 53, Issue 2, pp 77-84

First online:

Three newly delimited species of Saccharomyces sensu stricto

  • A. Vaughan MartiniAffiliated withDipartimento di Biologia Vegetale, Università degli Studi
  • , A. MartiniAffiliated withDipartimento di Biologia Vegetale, Università degli Studi

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Abstract

Deoxyribonucleic acid reassociation studies of 24 different wine and beer-associated strains of Saccharomyces confirmed the presence of three separate species. S. cerevisiae and S. bayanus strains had only 22% of their genomes in common. S. pastorianus, with intermediate hybridization values between S. cerevisiae and S. bayanus (52 and 72%, respectively) could possibly be a natural hybrid of the two species. S. pastorianus replaces S. carlsbergensis with which it is homologous for 93% of its genome, since the former species was described first by Hansen in 1904. These data do not agree with the results of traditional physiological tests.

Key words

Saccharomyces sensu stricto taxonomy DNA reassociation