Journal ArticleDOI
Cell division in Stichococcus
TLDR
Results indicate a close phyletic relationship between Stichococcus and Klebsormidium, two organisms which are now considered to be more closely related to the progenitors of the higher land plants than most of the other members of the Ulotrichales.Abstract:
Except for the lack of a centriole, interphase cell morphology and cell division in Stichococcus is similar to that in Klebsormidium. The cell in Stichococcus is largely filled by a chloroplast and pyrenoid, at the side of which are two mitochondria and one small peroxisome. The chloroplast/pyrenoid cleaves early in prophase, probably completely, and the nucleus is inserted between the two halves. A band of 3–5 microtubules always encircles the prophase nucleus; these disappear by metaphase. The spindle is open, the daughter nuclei remain far apart at telophase and during cytokinesis, and vacuoles collect between them; no phycoplast is associated with the cleavage furrow. These results indicate a close phyletic relationship between Stichococcus and Klebsormidium, two organisms which are now considered to be more closely related to the progenitors of the higher land plants than most of the other members of the Ulotrichales.read more
Citations
More filters
Book ChapterDOI
Variant mitoses in lower eukaryotes: indicators of the evolution of mitosis.
TL;DR: This chapter discusses the characteristics and evolution of mitosis, a types of nuclear division that produce two, or rarely more, daughter nuclei, each containing a chromosome complement approximately similar to that of the original nucleus.
Journal ArticleDOI
On the phylogenetic validity of the flagellar apparatus in green algae and other chlorophyll A and B containing plants.
TL;DR: It is suggested that the primitive chlorophyll a and b containing eucaryotic plants (algae) were probably scale-covered, had some type of cross-banded flagellar root component, and in one line a X-2-X-2 microtubular root system.
Journal ArticleDOI
PHYLOGENETIC POSITION OF KOLIELLA (CHLOROPHYTA) AS INFERRED FROM NUCLEAR AND CHLOROPLAST SMALL SUBUNIT rDNA
Agnieszka Katana,Jan Kwiatowski,Krzysztof Spalik,Bożena Zakryś,Elżbieta Szalacha,Hanna Szymańska +5 more
TL;DR: The phylogenetic position of Koliella, a chlorophyte characterized by Klebsormidium type cell division, was inferred from analyses of partial 18S r DNA and partial 16S rDNA, and high decay indices and bootstrap values supported high affinity for Trebouxiophyceae, however, the genus appeared to be polyphyletic.
Journal ArticleDOI
The cytoplast concept in dividing plant cells: cytoplasmic domains and the evolution of spatially organized cell division
TL;DR: The unique cytokinetic apparatus of higher plant cells comprises two cytoskeletal systems: a predictive preprophase band of microtubules (MTs), which defines the future division site, and the phragmoplast, which mediates crosswall formation after mitosis.
Journal ArticleDOI
Phylogenetic relationships of green algae assigned to the genus Planophila (Chlorophyta): evidence from 18S rDNA sequence data and ultrastructure
Thomas Friedl,Charles J. O'Kelly +1 more
TL;DR: This is the first robustly supported molecular phylogenetic analysis that places Prasiola in the Trebouxiophyceae, and the monotypic sarcinoid genus Pseudendocloniopsis is the closest relative of Planophila; the two genera represent the addition of a new morphological type to the Ulotrichales.
References
More filters
Journal ArticleDOI
A low-viscosity epoxy resin embedding medium for electron microscopy.
TL;DR: A low-viscosity embedding medium based on ERL-4206 is recommended for use in electron microscopy and has a long pot life of several days and infiltrates readily because of its low viscosity.
Journal ArticleDOI
The culture collection of algae at indiana university
TL;DR: All cultures in the Collection are available to all interested individuals and organizations, both academic and commercial, and to acadenmic institutions and nonprofit organizations the cost per culture is $2.002 postpaid; commercial organizations are charged $10.00.
Journal ArticleDOI
FINE STRUCTURE OF CELL DIVISION IN CHLAMYDOMONAS REINHARDI : Basal Bodies and Microtubules
TL;DR: It is proposed that microtubules participate in the formation of the cleavage furrow in C. reinhardi and related to cell division in other organisms.
Journal ArticleDOI
The Occurrence of Glycolate Dehydrogenase and Glycolate Oxidase in Green Plants: An Evolutionary Survey
TL;DR: Green tissues of all lower land plants examined, as well as three freshwater aquatic angiosperms, contained an enzyme resembling glycolate oxidase, in that it oxidized l- but not d-lactate in addition toglycolate, and was insensitive to 2 mm cyanide, and it is pointed out that this distribution pattern of glycolATE oxidase and Glycolate dehydrogenase among the green plants may have phylogenetic significance.