Electronic Resource
Springer
Archives of microbiology
79 (1971), S. 231-248
ISSN:
1432-072X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Summary 1. Ascosporogenesis of a diploid strain of Hansenula wingei was studied by electron microscopic examination of thin-sectioned cells and freeze-etch replicas. 2. Ascospore morphogenesis starts with proliferation of the endoplasmic reticulum which assumes a prominent position between the nucleus and the cytoplasmic vacuole. 3. Partitioning of the nucleus begins with invagination of the nuclear membrane, first in one plane and then in second plane perpendicular to the first, resulting in nuclear lobulation. Without loss of integrity of the nuclear membrane, the lobate nuclear mass segments into four meiotic products. 4. Endoplasmic reticulum becomes aligned around and between the daughter nuclei, and eventually a double track of endoplasmic reticulum encloses each to form the spore initials. 5. Maturation proceeds with separation of the two tracks of investing membrane and deposition of mucopolysaccharide in the intercisternal space. Deposition begins at the apices of the spore initials, continues toward the central body, and eventually continues around the body as the hat-shaped profile of mature ascospores is assumed. 6. The inner track of investing membrane becomes the plasmalemma of the ascospore, and the outer track becomes the outer limiting layer of the spore wall.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00408786
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