scholarly journals Cytological Effect of the Plant Hormone Putrescine on Allium cepa Root Tips

2010 ◽  
Vol 49 (1) ◽  
pp. 1-6
Keyword(s):  
Allium Cepa ◽  
Plant Hormone ◽  
Root Tips ◽  
Cytological Effect

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.

In Vitro Evaluation of Anti-Mitotic Activity of Green Synthesized Silver Nanoparticles from Ethanolic Extract of Chromolaena odorata, Caesalpinia coriaria (Bark and Leaves) using Allium cepa Roots

2021 ◽  
pp. 4107-4110
Author(s):  
Nishita Gogia ◽  
Anandhi D ◽  
Kanaga G ◽  
Revathi K
Keyword(s):  
Silver Nanoparticles ◽  
Mitotic Activity ◽  
Mitotic Index ◽  
Allium Cepa ◽  
Chromolaena Odorata ◽  
Root Tips ◽  
Antimitotic Activity ◽  
Biological Potential ◽  
Green Synthesized Silver Nanoparticles

The scope of the present study was to evaluate the In-vitro biological potential of Green synthesized silver nanoparticles from Chromolaena odorata, Caesalpinia coriaria (Bark) and Caesalpinia coriaria (Leaf). We investigated the effect of green synthesized silver nanoparticles from Chromolaena odorata, Caesalpinia coriaria (Bark) and Caesalpinia coriaria (Leaf) by studying anti-mitotic activity An attempt has been made to evaluate the anti-mitotic activity of silver nanoparticles using Allium cepa roots. The mitotic index of the root tips meristem was calculated and compared with the standard methotrexate. Antimitotic activity results shows the mitotic index was ranged from 30-40%. Green synthesized silver nanoparticles from Chromolaena odorato, Caesalpinia coriaria (Bark) and Caesalpinia coriaria (Leaf) possess significant anti-mitotic activity.

Cytotoxicity of the Fungicides Azoxystrobin and Difenoconazole in Root Tips of Allium cepa L.

2005 ◽  
Vol 1 (1) ◽  
pp. 65-80 ◽  
Author(s):  
S. Nithyameen ◽  
P.R. Jeyaramraja . ◽  
S. Manian .
Keyword(s):  
Allium Cepa ◽  
Root Tips ◽  
Allium Cepa L

Effects of Bromine on Mitosis in Root-tips of Allium cepa

Nature ◽  
1949 ◽  
Vol 163 (4131) ◽  
pp. 27-28 ◽  
Author(s):  
J. CHURÝ ◽  
VL. SLOUKA
Keyword(s):  
Allium Cepa ◽  
Root Tips
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