Abstract
Cells ofSaccharomyces rouxii from a normal broth culture were subjected to a high osmotic pressure (2 M KCl), fixed in 3% glutaraldehyde fortified with 2 M KCl, and then processed routinely for examination in a scanning electron microscope. Micrographs revealed birth and bud scars typical for the genus and an apparently undamaged surface topography. Protoplasts were prepared from the same material by digestion of cell walls with snail gut enzymes in the presence of 2 M KCl. Naked protoplasts were obtained and these exhibited surface invaginations. In addition, spheroidal protrusions were noted and these structures were equated with the periplasmic bodies previously described by transmission electron microscopy. The propensity for periplasmic body formation inSaccharomyces rouxii is contrasted with otherSaccharomyces species and the circumstantial evidence that relates periplasmic bodies to cryptic β-fructofuranosidase inS. rouxii is briefly discussed.
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