scholarly journals Preliminary research on lead absorption and translocation in root tip cells of Populus nigra "Italica" Moench.

2014 ◽  
Vol 57 (2) ◽  
pp. 217-222 ◽  
Author(s):  
Krystyna Idzikowska
Keyword(s):  
Endoplasmic Reticulum ◽  
Cell Wall ◽  
Adventitious Root ◽  
Apical Part ◽  
Populus Nigra ◽  
Root Tip ◽  
Lead Absorption ◽  
Preliminary Research ◽  
Tip Cells ◽  
Root Tip Cells

Observations were carried out to define the place of lead absorption within three regions of the poplar adventitious root tip (<em>Populus nigra</em> "Italica" Moench.) after 24-hour exposure to a solution of Pb(N0<sub>3</sub>)<sub>2</sub> (25 mg dm<sup>-3</sup> Pb). Deposits of lead were not observed in certain cells of the apical part of the meristem. In other cells, lead deposits were first observed in the lumen of several endomembrane compartments - the endoplasmic reticulum, dictyosomal stacks and nuclear envelope. Certain differences were noted in the amount of deposits in protoplasts with varied electron density. In the cells with greater deposits, lead was also observed in the cytoplasm, the mitochondria and the paramural bodies. Practically no lead precipitated in the cell wall. The presence of lead in the form of small deposit granules in the plasmodesmata may suggest transfer from cell to cell.

scholarly journals Vacuolar-Type H+ -ATPases Are Associated with the Endoplasmic Reticulum and Provacuoles of Root Tip Cells

1994 ◽  
Vol 106 (4) ◽  
pp. 1313-1324 ◽  
Author(s):  
E. M. Herman ◽  
X. Li ◽  
R. T. Su ◽  
P. Larsen ◽  
Ht. Hsu ◽  
...  
Keyword(s):  
Endoplasmic Reticulum ◽  
Root Tip ◽  
Tip Cells ◽  
Root Tip Cells

Endoplasmic reticulum preprophase band in dividing root-tip cells of Pinus brutia

Planta ◽  
2001 ◽  
Vol 213 (5) ◽  
pp. 824-827 ◽  
Author(s):  
M. Zachariadis ◽  
H. Quader ◽  
B. Galatis ◽  
P. Apostolakos
Keyword(s):  
Endoplasmic Reticulum ◽  
Preprophase Band ◽  
Root Tip ◽  
Pinus Brutia ◽  
Tip Cells ◽  
Root Tip Cells

scholarly journals Beryllium Stress-Induced Modifications in Antioxidant Machinery and Plant Ultrastructure in the Seedlings of Black and Yellow Seeded Oilseed Rape

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Skhawat Ali ◽  
Rong Jin ◽  
Rafaqat A. Gill ◽  
Theodore M. Mwamba ◽  
Na Zhang ◽  
...  
Keyword(s):  
Cell Wall ◽  
Total Soluble Protein ◽  
Root Tip ◽  
Dependent Manner ◽  
Electron Microscopic ◽  
Mesophyll Cells ◽  
Chlorophyll Contents ◽  
Leaf Mesophyll ◽  
Tip Cells ◽  
Root Tip Cells

Beryllium (Be) could be a threatening heavy metal pollutant in the agroecosystem that may severely affect the performance of crops. The present study was conducted to evaluate the toxic effects of Be (0, 100, 200, and 400 μM) on physiological, ultrastructure, and biochemical attributes in hydroponically grown six-day-old seedlings of two cultivars ofBrassica napusL., one tolerant (ZS 758, black seeded) and one sensitive (Zheda 622, yellow seeded). Higher Be concentrations reduced the plant growth, biomass production, chlorophyll contents, and the total soluble protein contents. A significant accumulation of ROS (H2O2, OH−) and MDA contents was observed in a dose-dependent manner. Antioxidant enzymatic activities including SOD, POD, GR, APX, and GSH (except CAT) were enhanced with the increase in Be concentrations in both cultivars. Relative transcript gene expression of above-mentioned antioxidant enzymes further confirmed the alterations induced by Be as depicted from higher involvement in the least susceptible cultivar ZS 758 as compared to Zheda 622. The electron microscopic study showed that higher level of Be (400 μM) greatly damaged the leaf mesophyll and root tip cells. More damage was observed in cultivar Zheda 622 as compared to ZS 758. The damage in leaf mesophyll cells was highlighted as the disruption in cell wall, immature nucleus, damaged mitochondria, and chloroplast structures. In root tip cells, disruption in Golgi bodies and damage in cell wall were clearly noticed. As a whole, the present study confirmed that more inhibitory effects were recorded in yellow seeded Zheda 622 as compared to black seeded ZS 758 cultivar, which is regarded as more sensitive cultivar.

Sunlight decreased genotoxicity of azadirachtin on root tip cells of Allium cepa and Eucrosia bicolor

2010 ◽  
Vol 73 (5) ◽  
pp. 949-954 ◽  
Author(s):  
W. Kwankua ◽  
S. Sengsai ◽  
C. Kuleung ◽  
N. Euawong
Keyword(s):  
Allium Cepa ◽  
Root Tip ◽  
Tip Cells ◽  
Root Tip Cells

Salt Stress-induced Programmed Cell Death in Rice Root Tip Cells

2007 ◽  
Vol 49 (4) ◽  
pp. 481-486 ◽  
Author(s):  
Jian-You Li ◽  
Ai-Liang Jiang ◽  
Wei Zhang
Keyword(s):  
Cell Death ◽  
Salt Stress ◽  
Programmed Cell Death ◽  
Rice Root ◽  
Root Tip ◽  
Tip Cells ◽  
Root Tip Cells

Cytological evidence bearing on the origin of the B genome in polyploid wheats

Genome ◽  
1988 ◽  
Vol 30 (1) ◽  
pp. 36-43 ◽  
Author(s):  
K. Kerby ◽  
J. Kuspira
Keyword(s):  
Dna Hybridization ◽  
Triticum Turgidum ◽  
Root Tip ◽  
Cytological Evidence ◽  
B Genome ◽  
Genome Donor ◽  
The One ◽  
Genome Donors ◽  
Tip Cells ◽  
Root Tip Cells

To help elucidate the origin of the B genome in polyploid wheats, karyotypes of Triticum turgidum, Triticum monoccum, and all six purported B genome donors were compared. The analysis utilized a common cytological procedure that employed the most advanced equipment for the measurement of chromosome lengths at metaphase in root tip cells. A comparison of the karyotypes of T. turgidum and T. monococcum permitted the identification of B genome chromosomes of T. turgidum. These consist of two SAT pairs, one ST pair, three SM pairs, and one M pair of homologues. Comparisons of the chromosomes of the B genome of T. turgidum with the karyotypes of the six putative B genome donors showed that only the karyotype of Aegilops searsii was similar to the one deduced for the donor of the B genome in T. turgidum, suggesting that Ae. searsii is, therefore, the most likely donor of the B genome to the polyploid wheats. Support for this conclusion has been derived from geographic, DNA-hybridization, karyotype, morphological, and protein data reported since 1977. Reasons why the B genome donor has not been unequivocally identified are discussed.Key words: phylogeny, karyotypes, Triticum turgidum, Triticum monococcum, B genome, B genome donors.

scholarly journals Squash Preparations of Living Root-Tip Cells

Nature ◽  
1949 ◽  
Vol 164 (4178) ◽  
pp. 930-930 ◽  
Author(s):  
J. CHAYEN
Keyword(s):  
Root Tip ◽  
Living Root ◽  
Tip Cells ◽  
Root Tip Cells
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