scholarly journals Genotoxicity Induced by Food Coloring Dyes on Meristematic Cells Root Tips of Allium Cepa

2019 ◽  
Vol Volume-3 (Issue-4) ◽  
pp. 116-118
Author(s):  
Sheetal Kaur ◽  
Priyadarshini Halady ◽  
B. Revathi | Lodhi Bushra | Dr. Swapna ◽  
Keyword(s):  
Allium Cepa ◽  
Root Tips ◽  
Meristematic Cells

The preprophase band: possible involvement in the formation of the cell wall

1976 ◽  
Vol 22 (2) ◽  
pp. 403-411 ◽  
Author(s):  
M.J. Packard ◽  
S.M. Stack
Keyword(s):  
Cell Wall ◽  
Allium Cepa ◽  
Cell Walls ◽  
Preprophase Band ◽  
Adjacent Cell ◽  
Root Tips ◽  
Meristematic Cells ◽  
Narrow Region ◽  
The Matrix

Numerous vesicles were observed among the microtubules of the “preprophase” band in prophase cells from root tips of Allium cepa. The content of these vesicles looks similar to the matrix of adjacent cell walls, and these vesicles often appear to be involved in exocytosis. In addition, the cell walls perpendicular to the plane of (beneath) the preprophase band are often differentially thickened compared to the walls lying parallel to the plane of the band. Our interpretation of these observations is that the preprophase band may direct or channel vesicles containing precursors of the cell wall to localized regions of wall synthesis. The incorporation of constituents of the cell wall into a narrow region defined by the position of the preprophase band may be a mechanism that ensures unidirecitonal growth of meristematic cells.

scholarly journals Influence of extract from shoots of Taxus baccata var. elegantissima on ultrastructure and tubulin cytoskeleton of meristematic cells of Allium cepa L. roots

2014 ◽  
Vol 71 (3) ◽  
pp. 211-221 ◽  
Author(s):  
Agnieszka Majewska ◽  
Mirosława Furmanowa ◽  
Kazimierz Głowniak ◽  
Joanna Guzewska ◽  
Alicja Zobel ◽  
...  
Keyword(s):  
Allium Cepa ◽  
Chromatin Condensation ◽  
Preprophase Band ◽  
Taxus Baccata ◽  
Cell Nuclei ◽  
Root Tips ◽  
Meristematic Cells ◽  
Allium Cepa L ◽  
Interphase Cells ◽  
Average Size

We investigated the influence of extract from <em>Taxus baccata</em> var. Elegantissima (TbE) shoots in 1:8 dilution, containing paclitaxel in concentration of 81,6 µg/g fresh mass on ultrastructure and tubulin cytoskeleton of meristematic cells of <em>Allium cepa</em> L. root tips. Incubation time 3, 6, 12 and 24 h was followed with postincubation in water for 12 and 24 h. During shorter incubation (till 12 h) the surface of the cell nuclei decreased and chromatin became condensed (in comparison to control) but after 24 h the average surface increased and chromatin condensation decreased. In the course of incubation the average size of plastids and vacuoles increased. Moreover, after treatment mitochondria and plastids showed degradation of ultrastructure, which was reversed after 12 h of postincubation. Immunocytochemical assays demonstrated that in the course of incubation in the ThE extract, the tubulin cytoskeleton became partially disorganised. In most interphase cells, cortical microtubules (MTs) lost their oval transverse orientation. The preprophase band (PPB) position in the cell was often asymmetrical. The MTs array of the karyokinetic spindle and phragmoplast was also disturbed. These alterations were completely reversed during postincubation.

scholarly journals Influence of hypoxia on protoplast structure in the plant cell

2015 ◽  
Vol 44 (3) ◽  
pp. 369-376
Author(s):  
Maria Podbielkowska ◽  
Bożena Borys
Keyword(s):  
Endoplasmic Reticulum ◽  
Nucleic Acids ◽  
Allium Cepa ◽  
Plant Cell ◽  
Rough Endoplasmic Reticulum ◽  
Sodium Azide ◽  
Root Tips ◽  
Respiratory Inhibitors ◽  
Meristematic Cells ◽  
Parallel Structures

An influence of hypoxia on the protoplast’s structure in the root tips meristematic cells of onion (<i>Allium cepa</i> L.) and of <i>Tradescantia bracteata</i> Small has been investigated. Hypoxia was caused either by respiratory inhibitors (sodium azide, 2,4-dinitrophenol), phosfon-D or by anaeroibic conditions. In both cases characteristic membranization of cytoplasm was observed. It appeared as spherical and parallel structures of rough endoplasmic reticulum. The observed hypertrophy was not connected with the increase of nucleic acids and proteins synthesis. In the examined cells the membranization was accompanied by an increase of the lipids content.

scholarly journals Antimitotic effect, G2/M accumulation, chromosomal and ultrastructure changes in meristematic cells of Allium cepa L. root tips treated with the extract from Rhodiola rosea roots

Caryologia ◽  
2003 ◽  
Vol 56 (3) ◽  
pp. 337-351 ◽  
Author(s):  
Agnieszka Majewska ◽  
Ewa Wolska ◽  
Elwira Śliwińska ◽  
Mirosława Furmanowa ◽  
Natalia Urbańska ◽  
...  
Keyword(s):  
Allium Cepa ◽  
Rhodiola Rosea ◽  
Root Tips ◽  
Meristematic Cells ◽  
Allium Cepa L ◽  
Antimitotic Effect

scholarly journals Effect of water extract from leaves of Nerium oleander L. on mitosis

2015 ◽  
Vol 40 (4) ◽  
pp. 623-631
Author(s):  
J. A. Tarkowska
Keyword(s):  
Electron Microscope ◽  
Allium Cepa ◽  
Mitotic Spindle ◽  
Water Extract ◽  
Water Soluble ◽  
Nerium Oleander ◽  
Root Tips ◽  
Meristematic Cells ◽  
Effect Of Water

The effect of water extract from leaves of <i>Nerium oleander</i> L. on the mitosis in meristematic cells of <i>Allium cepa</i> L. root tips has been studied. Observations were made on the changes during incubation and postincubation. Significant disturbances were observed in the development of the mitotic spindle leading to the formation of polyploid and hypoploid nuclei capable of further division. Substances contained in the water extract, and causing the disturbances, are water soluble glycosides. Introductory observations under an electron microscope indicate that the glycosides desorganize the continuous fibres of the spindle which can be considered as the direct cause of the observed disturbances.

Effects of long exposure to spent potliner on seeds, root tips, and meristematic cells of Allium cepa L.

2017 ◽  
Vol 189 (10) ◽  
Author(s):  
Larissa Fonseca Andrade-Vieira ◽  
Marcel José Palmieri ◽  
Lisete Chamma Davide
Keyword(s):  
Allium Cepa ◽  
Root Tips ◽  
Meristematic Cells ◽  
Allium Cepa L

scholarly journals Antiproliferative effect of the hydroalcoholic extract of Hymenaea stigonocarpa Mart. ex Hayne (Fabaceae, Caesalpinioideae) on the meristematic cells of Allium cepa L. roots

Biotemas ◽  
2014 ◽  
Vol 28 (1) ◽  
pp. 45 ◽  
Author(s):  
Layana Menezes da Silva ◽  
Ana Paula Peron ◽  
Francisco Ronielson da Silva Carvalho ◽  
Livia Martins ◽  
Iana Felício Bantim Calou ◽  
...  
Keyword(s):  
Allium Cepa ◽  
Antiproliferative Effect ◽  
Hydroalcoholic Extract ◽  
Meristematic Cells ◽  
Allium Cepa L
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