Precise DNA-DNA reassociation data were obtained for new biological species S. cariocanus, S. kudriavzevii and S. mikatae, for the first time. The three species showed 25-51 % - of DNA-DNA reassociation with one another and with the known species S. cerevisiae, S. bayanus and S. paradoxus.Only in the combination S. paradoxus × S. cariocanus there was 99 % DNA-DNA homology. Despite high DNA-DNA reassociation value, the two yeasts are genetically isolated: their hybrids are sterile forming non-viable meiotic products (ascospores). Having four reciprocal translocations in its karyotype, S. cariocanus represents species in statu nascendi.

Yuliya V Mikhailova

Komarov Botanical Institute, Russian Academy of Sciences. Saint Petersburg, Russia


Sofia Castello

New University Lisbon, Caparica, Portugal


Elena S Naumova

Research Institute for Genetics and Selection of Industrial Microorganisms, Moscow, RF


Gennadiy I Naumov

Research Institute for Genetics and Selection of Industrial Microorganisms, Moscow, RF


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Copyright (c) 2009 Mikhailova Y.V., Castello S., Naumova E.S., Naumov G.I.

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