Author

Guorong Xu

Document Type

Thesis - Open Access

Award Date

1990

Degree Name

Master of Science (MS)

Department

Chemistry

First Advisor

Thomas P. West

Abstract

Yeast is the common name given to fungi that are primarily unicellular. Yeast are simple eukaryotic organisms which are commonly used in biochemistry, cellular biology and molecular biology to provide information concerning biochemical and genetic processes. Cellular and subcellular structures, metabolic pathways, protein synthesis, DNA and RNA syntheses, and gene expression have been examined in yeast species. Perhaps the most widely used species of yeast are Saccharomyces cerevisiae. This species reproduces by budding or fission sexual reproduction occurs vegetatively in S.­ cerevisiae when two haploid cells of opposite mating types fuse to form a diploid zygote. The diploid vegetative cells may either continue the vegetative cycle by budding or under special conditions undergo meiosis to produce four haploid ascospores. These ascospores can undergo germination to form haploid cells. Of the developmental processes known in yeast, germination of yeast ascospores is probably the least understood. Germination and outgrowth of yeast spores provide an excellent biological system to study biochemical events during eukaryotic development. The developmental sequence involved in the transition of a S. cerevisiae ascospore to a vegetative cell has been studied but is not fully understood (1-4). The heterothallic strain AP-3 of S. cerevisiae is utilized in this investigation of yeast germination. Prior work has largely focused upon S. cerevisiae homothallic strains. In the present study, ascospore germination was analyzed from both a nutritional as well as a biochemical perspective.

Library of Congress Subject Headings

Saccharomyces cerevisiae
Ascospores
Germination
Yeast

Format

application/pdf

Number of Pages

78

Publisher

South Dakota State University

Included in

Chemistry Commons

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