Ultrastructure of the Ascospore Walls of Schizosaccharomyces Pombe During Germination

ABSTRACT

At onset of germination, spores of S. pombe show localized swelling, the first vestige of germ-tube extension by the spore wall. As germination progresses, the original spore wall becomes thinned at the site of extension and is medially replaced by a new germinative layer. Germ tube growth is not erumpent. Cytology of germination of other spores is compared.

Key Words:

• spore wall
• germination
• germ tube
• differentiation