Ultrastructure of the ascospores of some species of the Torulaspora group |
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Authors: | N J W Kreger-van Rij M Veenhuis |
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Institution: | (1) Laboratory of Medical Microbiology Department of Biology, State University, Groningen, The Netherlands;(2) Laboratory of Electron Microscopy, Department of Biology, State University, Groningen, The Netherlands |
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Abstract: | Development and germination of the ascospores in species of the Torulaspora group of yeasts have been described. Most species had warty spores which, in sections, showed a dark outer layer consisting of the outer unit membrane of the prospore wall and a layer underneath formed at an early stage of development of the spores. In mature spores the light inner layer of the wall was delimited at the outside by a thin dark layer. The warts often contained dark material. The ascospores of two Pichia and three Debaryomyces species were studied for comparison; they differed in sections from the Torulaspora spores. The taxonomic implications of the ultrastructural observations have been discussed. |
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