Contractile elements of Lemna trisulca L. glycerinated cell models during chloroplast translocations

2000 ◽  
Vol 78 (4) ◽  
pp. 503-510
Author(s):  
Robert A Rinaldi ◽  
Barbara Kalisz-Nowak ◽  
Wlodzimierz Korohoda ◽  
Stanislaw Wieckowski ◽  
Wincenty Kilarski ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Cell Wall ◽  
Plasma Membrane ◽  
Contractile Element ◽  
Cell Models ◽  
Chloroplast Membranes ◽  
Chloroplast Membrane ◽  
Membrane Cell

Electron microscopy of Lemna glycerinated cell models depicts contractile elements during chloroplast translocations. One contractile element, the thin ectoplasmic layer, is [Formula: see text] 0.4 µm thick, pressed against plasma membrane-cell wall. Thin ectoplasmic layer contains numerous oriented filaments and some appear to be actin and myosin. Another contractile element is the outer chloroplast membrane which envelops each chloroplast and joins or fuses with the thin ectoplasmic layer. Choroplast interconnections are formed between two or more chloroplasts by outer chloroplast membranes; they enhance chloroplast communications, translocations, and molecular exchanges.Key words: chloroplast translocations, contractility, tubular connections.

Enrichment of vitronectin- and fibronectin-like proteins in NaCI-adapted plant cells and evidence for their involvement in plasma membrane-cell wall adhesion

1993 ◽  
Vol 3 (5) ◽  
pp. 637-646 ◽  
Author(s):  
Jian-Kang Zhu ◽  
Jun Shi ◽  
Utpal Singh ◽  
Sarah E. Wyatt ◽  
Ray A. Bressan ◽  
...  
Keyword(s):  
Cell Wall ◽  
Plasma Membrane ◽  
Plant Cells ◽  
Membrane Cell

scholarly journals Formation of flavone-based wooly fibres by glandular trichomes of Dionysia tapetodes

2020 ◽  
Author(s):  
Matthieu Bourdon ◽  
Josephine Gaynord ◽  
Karin Müller ◽  
Gareth Evans ◽  
Simon Wallis ◽  
...  
Keyword(s):  
Cell Wall ◽  
Plasma Membrane ◽  
Cell Biology ◽  
Glandular Trichomes ◽  
Thread Formation ◽  
Flavone Derivatives ◽  
Chemical Techniques ◽  
Surface Covering ◽  
Membrane Cell ◽  
Putative Mechanism

AbstractDionysia tapetodes, a small cushion-forming mountainous evergreen in the Primulaceae, possesses a vast surface-covering of long silky fibres forming the characteristic “wooly” farina. This contrasts with some related Primula which instead possess a powdery farina. Using a combination of cell biology and analytical chemical techniques, we provide a detailed insight of wooly farina formation by glandular trichomes that produce a mixture of flavone and substituted flavone derivatives, including hydroxyflavones. Conversely, our analysis show that the powdery form consist almost entirely of flavone. The wooly farina in D. tapetodes is extruded through specific sites at the surface of the glandular head cell, characterised by a small complete gap in the plasma membrane, cell wall and cuticle. The data is consistent with formation and thread elongation occurring from within the cell. The putative mechanism of wool thread formation and its stability is discussed.

scholarly journals Plasma membrane/cell wall perturbation activates a novel cell cycle checkpoint during G1 inSaccharomyces cerevisiae

2016 ◽  
Vol 113 (25) ◽  
pp. 6910-6915 ◽  
Author(s):  
Keiko Kono ◽  
Amr Al-Zain ◽  
Lea Schroeder ◽  
Makoto Nakanishi ◽  
Amy E. Ikui
Keyword(s):  
Cell Cycle ◽  
Wound Healing ◽  
Cell Wall ◽  
Plasma Membrane ◽  
Dna Replication ◽  
Membrane Damage ◽  
Cell Cycle Checkpoint ◽  
Plasma Membrane Damage ◽  
Cycle Checkpoint ◽  
Membrane Cell

Cellular wound healing or the repair of plasma membrane/cell wall damage (plasma membrane damage) occurs frequently in nature. Although various cellular perturbations, such as DNA damage, spindle misalignment, and impaired daughter cell formation, are monitored by cell cycle checkpoint mechanisms in budding yeast, whether plasma membrane damage is monitored by any of these checkpoints remains to be addressed. Here, we define the mechanism by which cells sense membrane damage and inhibit DNA replication. We found that the inhibition of DNA replication upon plasma membrane damage requires GSK3/Mck1-dependent degradation of Cdc6, a component of the prereplicative complex. Furthermore, the CDK inhibitor Sic1 is stabilized in response to plasma membrane damage, leading to cell integrity maintenance in parallel with the Mck1-Cdc6 pathway. Cells defective in both Cdc6 degradation and Sic1 stabilization failed to grow in the presence of plasma membrane damage. Taking these data together, we propose that plasma membrane damage triggers G1 arrest via Cdc6 degradation and Sic1 stabilization to promote the cellular wound healing process.

Ultrastructure of a marine psychrophilic Vibrio

1970 ◽  
Vol 16 (11) ◽  
pp. 1027-1031 ◽  
Author(s):  
S. F. Kennedy ◽  
R. R. Colwell ◽  
G. B. Chapman
Keyword(s):  
Electron Microscopy ◽  
Cell Wall ◽  
Plasma Membrane ◽  
Cell Division ◽  
Wall Material ◽  
Cross Wall ◽  
Growth Stages ◽  
Culture Age ◽  
Primary Mechanism ◽  
Age Studies

The structure of Vibrio marinus strain PS-207 was studied by both phase and electron microscopy. It was found to possess a trilaminar plasma membrane and cell wall. Membrane-bounded subunits containing DNA-like material were found dispersed throughout the cytoplasm. Giant round forms or "macrospheres" were observed in all growth stages. The size, shape, and construction of the "macrospheres" showed some variation, but could not be related to culture age. Studies of cell division in V. marinus strain PS-207 indicate the primary mechanism to be a synthesis and centripetal deposition of plasma membrane with a concomitant or subsequent synthesis and centripetal deposition of cross wall material.

scholarly journals Plant glycosylphosphatidylinositol anchored proteins at the plasma membrane-cell wall nexus

2018 ◽  
Vol 60 (8) ◽  
pp. 649-669 ◽  
Author(s):  
Trevor H. Yeats ◽  
Antony Bacic ◽  
Kim L. Johnson
Keyword(s):  
Cell Wall ◽  
Plasma Membrane ◽  
Membrane Cell

Enlarged Crystalline Patches on the Plasma Membrane of Yeast Protoplasts

1980 ◽  
Vol 38 ◽  
pp. 686-687
Author(s):  
G. Sosinsky ◽  
R. Schekman ◽  
R. Glaeser
Keyword(s):  
Electron Microscopy ◽  
Cell Wall ◽  
Plasma Membrane ◽  
High Resolution Electron Microscopy ◽  
Yeast Cells ◽  
Physiological Conditions ◽  
Resolution Electron ◽  
Yeast Protoplasts ◽  
Intramembraneous Particles ◽  
Crystalline Array

The crystalline patches of intramembraneous particles that form in the yeast plasma membrane, under stationary state physiological conditions, represent a potentially interesting specimen for high resolution electron microscopy. Isolation of these crystalline membrane patches first requires removal of the cell wall and the formation of osmotically fragile yeast protoplasts. In developing a procedure for the isolation of these crystalline membrane patches, we have found that the intramembraneous particles form much larger crystalline patches in protoplasts than in intact yeast cells. We have performed deep etch experiments and have found that the crystalline array of particles is not expressed on the extracellular surface of the plasma membrane.

scholarly journals From signal to form: aspects of the cytoskeleton-plasma membrane—cell wall continuuum in root hair tips

1997 ◽  
Vol 48 (11) ◽  
pp. 1881-1896 ◽  
Author(s):  
Deborah D. Miller ◽  
Norbert C.A. de Ruijter ◽  
Anne Mie C. Emons
Keyword(s):  
Cell Wall ◽  
Plasma Membrane ◽  
Root Hair ◽  
Membrane Cell
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