Ultrastructure and Chemistry of the Zygospore Wall of Spirogyra

1980 ◽  
Vol 46 (4) ◽  
pp. 485-487 ◽  
Author(s):  
MUHAMMAD ASHRAF ◽  
M. B. E. GODWARD
Keyword(s):  
Zygospore Wall

Some Zygnemataceae (Chlorophyta) of Ontario, Canada, including descriptions of two new species

1989 ◽  
Vol 67 (11) ◽  
pp. 3233-3247 ◽  
Author(s):  
Yin-Xin Wei ◽  
Ying-Kit Yung ◽  
Michael B. Jackson ◽  
Takashi Sawa
Keyword(s):  
New Species ◽  
Vegetative Cells ◽  
Important Species ◽  
Data Support ◽  
Wall Structures ◽  
Two New Species ◽  
Acidic Sites ◽  
Zygospore Wall

We examined 1455 filamentous algal samples collected from 32 Ontario sites since 1981 and identified 21 Zygnemataceae, including two new species: Spirogyra favosa Wei et Yung sp.nov. and Zygnema lacustre Wei et Yung sp.nov. Of the 21 taxa described in this paper, Zygogonium tunetanum, Temnogametum tirupatiense, Mougeotia quadragulata, and Spirogyra fennica were the important species in the acidic sites, whereas Mougeotia laetevirens, Zygnemopsis stephensiae, and Spirogyra jatobae were common in the circumneutral and alkaline locations. Zygogonium tunetanum was the most important metaphytic alga in lakes with pH 6.8 and lower, proliferating in the littoral areas of acidic Ontario lakes. These data support the view that the taxonomy of Zygnemataceae should place more emphasis on the zygospore wall structures and ornamentations and less emphasis on the dimensions of vegetative cells.

Interpretation of zygospore wall structure and taxonomy of Spirogyra and Sirogonium (Zygnemataceae, Chlorophyta)

Phycologia ◽  
1985 ◽  
Vol 24 (2) ◽  
pp. 231-239 ◽  
Author(s):  
Herbert M. Hull ◽  
Robert W. Hoshaw ◽  
Jen-Chyong Wang
Keyword(s):  
Wall Structure ◽  
Zygospore Wall

scholarly journals COMPLEMENTATION AND PRELIMINARY LINKAGE ANALYSIS OF ZYGOTE MATURATION MUTANTS OF THE HOMOTHALLIC ALGA, CHLAMYDOMONAS MONOICA

Genetics ◽  
1983 ◽  
Vol 103 (3) ◽  
pp. 429-445
Author(s):  
Karen P VanWinkle-Swift ◽  
Cynthia G Burrascano
Keyword(s):  
Cell Growth ◽  
Linkage Analysis ◽  
Ultraviolet Irradiation ◽  
Nuclear Genome ◽  
Pair Formation ◽  
Tetrad Analysis ◽  
Mutant Strains ◽  
Complementation Groups ◽  
Chlamydomonas Monoica ◽  
Zygospore Wall

ABSTRACT Sexual reproduction in Chlamydomonas monoica is homothallic: pair formation and cell fusion occur in clonal culture and give rise to a heavily walled diploid zygospore. During maturation of the young zygote, a distinctive "primary zygote wall" is released before the development of the highly reticulate zygospore wall. Using ethyl methanesulfonate and ultraviolet irradiation as mutagens, we have isolated 19 maturation-defective (zym) mutant strains which upon self-mating produce inviable zygotes. These zygotes fail to release a primary zygote wall, fail to develop the normal zygospore wall, and eventually undergo spontaneous lysis. In nearly all cases, the mutations appear to be expressed only in the diploid zygote; pleiotropic effects on vegetative cell growth or morphology are not evident.—Complementation testing performed on 17 of these mutants indicates that all are recessive and that they define seven distinct complementation groups. Preliminary tetrad analysis of two-factor and multifactor zym crosses provides no evidence for physical clustering of the maturation genes, and instead suggests that they are widely distributed throughout the nuclear genome.

scholarly journals Development of the Zygospore Wall in Rhizopus sexualis (Smith) Callen

1968 ◽  
Vol 54 (1) ◽  
pp. 13-20 ◽  
Author(s):  
L. E. HAWKER ◽  
M. A. GOODAY
Keyword(s):  
Zygospore Wall

Studies on Temperature Requirements, Odor Production and Zygospore Wall Undulation of the Genus Basidiobolus

Mycologia ◽  
1972 ◽  
Vol 64 (3) ◽  
pp. 467-474 ◽  
Author(s):  
James A. Hutchison ◽  
Douglas S. King ◽  
Max A. Nickerson
Keyword(s):  
Temperature Requirements ◽  
Zygospore Wall ◽  
Odor Production
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