Sporulation in Hansenula wingei is induced by nitrogen starvation in maltose-containing media.

Journal of Bacteriology
M Crandall, L J Lawrence

Abstract

The sexually agglutinative yeast Hansenula wingei lives in association with bark beetles that inhabit coniferous trees. This yeast was induced to sporulate by malt extract, which contains a high percentage of maltose (50%) and a low percentage of nitrogen (0.5%). A solution of 1.5% maltose without any growth factors also induced ascosporogenesis in H. wingei. Thus, only a carbon source is required for sporulation as in Saccharomyces. However, potassium acetate did not induce sporulation in H. wingei as it does in S. cerevisiae. Instead, disaccharides (such as maltose, sucrose, or cellobiose) promote sporulation better than either monosaccharides (such as dextrose, fructose, or mannose) or respiratory substrates (such as ethanol or glycerol). The specificity of disaccharides in promoting sporulation in H. wingei may be considered an adaptation since these disaccharides are present in the natural environment of this yeast. In addition, the specificity of disaccharides may be related to the induction of the disaccharidase because cells precultured on dextrose sporulate well on maltose, but cells precultured on maltose sporulate poorly on maltose. When (NH(4))(2)SO(4) was added at a low concentration (3 mM) to synthetic sporulation...Continue Reading

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Citations

Jan 29, 2013·Eukaryotic Cell·Rongpeng LiSheng Yuan
Jan 1, 1982·The International Journal of Biochemistry·A Ota

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