Microtubule reorganization accompanying preprophase band formation in guard mother cells ofAvena sativa L.

PROTOPLASMA ◽  
1989 ◽  
Vol 149 (2-3) ◽  
pp. 89-94 ◽  
Author(s):  
J. B. Mullinax ◽  
B. A. Palevitz
Keyword(s):  
Preprophase Band ◽  
Band Formation ◽  
Guard Mother Cells ◽  
Mother Cells

Development of the preprophase band from random cytoplasmic microtubules in guard mother cells of Allium cepa L.

Planta ◽  
1989 ◽  
Vol 178 (3) ◽  
pp. 291-296 ◽  
Author(s):  
Y. Mineyuki ◽  
J. Marc ◽  
B. A. Palevitz
Keyword(s):  
Allium Cepa ◽  
Preprophase Band ◽  
Allium Cepa L ◽  
Cytoplasmic Microtubules ◽  
Guard Mother Cells ◽  
Mother Cells

The subcellular organization of stomatal initials in sugarcane leaves: the guard and subsidiary mother cells

1977 ◽  
Vol 55 (22) ◽  
pp. 2801-2809 ◽  
Author(s):  
A. P. Singh
Keyword(s):  
Electron Microscopy ◽  
Endoplasmic Reticulum ◽  
Close Association ◽  
Preprophase Band ◽  
Central Position ◽  
Guard Mother Cell ◽  
Subcellular Organization ◽  
Guard Mother Cells ◽  
Mother Cells ◽  
Preprophase Bands

The subcellular organization of guard and subsidiary mother cells in sugarcane leaves was examined by electron microscopy. Guard and subsidiary mother cells assume a characteristic shape before mitosis and contain variable numbers of mitochondria, proplastids, dictyosomes, and cisternae of rough endoplasmic reticulum. In guard mother cells, the nucleus occupies a central position, whereas in subsidiary mother cells, the nucleus is located toward one end of the cell, near the guard mother cell. Microtubules are found in both guard and subsidiary mother cells and are either closely grouped to form defined preprophase bands or randomly dispersed between the nucleus and the preprophase bands. Many of the dispersed microtubules occur in close association with the nucleus in both guard and subsidiary mother cells. Possible functions for these preprophase microtubules are discussed in relation to their organization in the preprophase band, their orientation, and their distribution within guard and subsidiary mother cells.

Development of the Quadripolar Meiotic Cytoskeleton in Spore Mother Cells of the Moss Funaria Hygrometrica

1988 ◽  
Vol 91 (1) ◽  
pp. 127-137
Author(s):  
C. H. BUSBY ◽  
B.E. S. GUNNING
Keyword(s):  
Meiotic Prophase ◽  
Metaphase Plate ◽  
Plant Cells ◽  
Preprophase Band ◽  
The Other ◽  
Higher Plant ◽  
Funaria Hygrometrica ◽  
Condensed Form ◽  
Prophase Nucleus ◽  
Mother Cells

Evidence presented in the accompanying paper that plastids function as microtubule (MT)-organizing centres for development of the quadripolar cytoskeleton of pre-meiotic spore mother cells (SMCs) in the moss Funaria hygrometrica is complemented here by observations on the MT system in these cells. Early in meiotic prophase numerous MTs align progressively along the two plastids as they elongate. Concomitant with (and perhaps causal for) plastid rotation, new MT arrays grow from each tip of each plastid to both tips of the other plastid. The ‘along-plastid’ and ‘between-plastid’ arrays ultimately form the edges of a tetrahedron, enclosing the prophase nucleus. MT breakdown at the centre of each edge leaves four cones of MTs, one emanating from each vertex, located at the plastid tips. These partially fuse in between-plastid pairs to give a twisted spindle with broad knife-edge poles oriented at right angles to one another, i.e. a condensed form of the quadripolar precursor. The twist causes the metaphase plate and the subsequent phragmoplast and organelle band to be saddle-shaped, and the daughter nuclei to be elongated perpendicular to one another along the two knife edges. The tetrahedral array returns during interkinesis and again breaks down into four cones of MTs centred on the plastid tips; these, however, now become individual half spindles for the two perpendicularly arranged second division spindles. When meiosis is completed the four haploid nuclei thus come to lie at the vertices of a tetrahedron that was established by MT-mediated plastid positioning during meiotic prophase. The tetrahedral cage of MTs precedes meiosis yet predicts the planes of division, and in these two respects it is the meiotic counterpart of the preprophase band of MTs, which develops before mitosis in most higher plant cells.

Effects of centrifugation on preprophase-band formation in Adiantum protonemata

Planta ◽  
1991 ◽  
Vol 183 (3) ◽  
Author(s):  
Takashi Murata ◽  
Masamitsu Wada
Keyword(s):  
Preprophase Band ◽  
Band Formation

Comparative effects of phalloidin and cytochalasin B on motility and morphogenesis in Allium

1980 ◽  
Vol 58 (7) ◽  
pp. 773-785 ◽  
Author(s):  
Barry A. Palevitz
Keyword(s):  
Cytochalasin B ◽  
Cell Plate ◽  
Wall Thickening ◽  
Animal Cells ◽  
Host Fungus ◽  
Guard Mother Cells ◽  
Mother Cells ◽  
Chromosome Motion

Cytochalasin B (CB), thought to disaggregate F-actin in animal cells, and phalloidin (Phal), known to stabilize F-actin in vivo and in vitro, have nearly identical effects on cotyledon epidermal cells of Allium cepa. Both drugs rapidly induce cessation of streaming and both, by preventing normal telophase reorientation movement, lead to abnormal division planes in dividing guard mother cells. Neither, however, prevents normal microtubule deposition, wall thickening, and cellulose orientation during guard cell differentiation. Furthermore, both drugs have no effect on spindle formation and anaphase chromosome motion. Examination of Nitella and Chara cells, in which streaming had been stopped by either agent, shows that microfilament cables are still present. With both drugs, the minimum effective concentrations were routinely used (CB, 2 μM; Phal, 100–200 μM). Our results are discussed in terms of the mode of action of these drugs and their possible role in host-fungus interactions. Implications for the mechanisms underlying cell plate alignment, cellulose orientation, and cytoplasmic streaming are discussed.

Establishment of division plane and mitosis in monoplastidic guard mother cells ofSelaginella

1992 ◽  
Vol 23 (2) ◽  
pp. 89-101 ◽  
Author(s):  
Ann L. Cleary ◽  
Roy C. Brown ◽  
Betty E. Lemmon
Keyword(s):  
Division Plane ◽  
Guard Mother Cells ◽  
Mother Cells

scholarly journals Arabidopsis TONNEAU1 Proteins Are Essential for Preprophase Band Formation and Interact with Centrin

2008 ◽  
Vol 20 (8) ◽  
pp. 2146-2159 ◽  
Author(s):  
Juliette Azimzadeh ◽  
Philippe Nacry ◽  
Anna Christodoulidou ◽  
Stéphanie Drevensek ◽  
Christine Camilleri ◽  
...  
Keyword(s):  
Preprophase Band ◽  
Band Formation

IQ67 DOMAIN proteins facilitate preprophase band formation and division-plane orientation

Nature Plants ◽  
2021 ◽  
Author(s):  
Pratibha Kumari ◽  
Pradeep Dahiya ◽  
Pantelis Livanos ◽  
Luise Zergiebel ◽  
Malte Kölling ◽  
...  
Keyword(s):  
Preprophase Band ◽  
Band Formation ◽  
Division Plane ◽  
Plane Orientation ◽  
Division Plane Orientation ◽  
Iq67 Domain
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