Reversible pseudohyphal growth in haploid Saccharomyces cerevisiae is an aerobic process

Curr Genet. May-Jun 1993;23(5-6):388-91. doi: 10.1007/BF00312623.


Pseudohyphal growth in Saccharomyces cerevisiae has been postulated to be an adaptation to foraging for nitrogen during nitrogen starvation. This process was described as a strictly diploid phenomenon which did not occur in haploid yeast cells and was under the genetic control of both the mating-type locus and a group of five genes, the BUD genes, regulating bud formation. We have also observed a dimorphic growth pattern in yeast growing on various nitrogen-limiting synthetic media. However, and in contrast to a previous report, we find that pseudohyphal growth is not precluded in haploid cells. We demonstrate that haploid pseudohyphal growth is strictly oxygen-dependent and is rapidly reversible, defining pseudohyphal growth as a reversible developmental pathway in yeast.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Haploidy
  • Oxygen / metabolism*
  • Saccharomyces cerevisiae / genetics
  • Saccharomyces cerevisiae / growth & development*
  • Saccharomyces cerevisiae / metabolism


  • Oxygen