A Genetic Framework for the Control of Cell Division and Differentiation in the Root Meristem

Science ◽  
2008 ◽  
Vol 322 (5906) ◽  
pp. 1380-1384 ◽  
Author(s):  
R. D. Ioio ◽  
K. Nakamura ◽  
L. Moubayidin ◽  
S. Perilli ◽  
M. Taniguchi ◽  
...  
Keyword(s):  
Cell Division ◽  
Root Meristem

scholarly journals Toxicity at the cellular level of artificial synthetic flavorings

2016 ◽  
Vol 38 (3) ◽  
pp. 297
Author(s):  
Ila Monize Sousa Sales ◽  
Jussara Damascena de Oliveira ◽  
Fabelina Karollyne Silva dos Santos ◽  
Lidiane De Lima Feitoza ◽  
João Marcelo de Castro e Sousa ◽  
...  
Keyword(s):  
Cell Division ◽  
Root Meristem ◽  
Combined Treatment ◽  
Optical Microscope ◽  
Cellular Level ◽  
Combined Treatments ◽  
Division Rate ◽  
Cell Division Rate ◽  
Allium Cepa L ◽  
Genotoxic Action

 The goal of the present study was to evaluate the cytotoxicity and genotoxicity of artificial synthetic flavoring agents cookie and tutti-frutti. To this end, root meristem cells of Allium cepa L. were exposed to these substances in exposure times of 24 and 48 hour using individual doses of 0.3; 0.6 and 0.9 mL and doses combined as follows: 0.3 mL + 0.3 mL; 0.6 mL and 0.9 mL + 0.6 mL + 0.9 mL. After applying the treatments, root meristems were fixed, hydrolyzed, stained and analyzed a total of 5,000 cells using an optical microscope to evaluate each dose and combined treatment. All three doses of cookie flavoring and combined treatments significantly inhibited cell division of the tissue studied. Doses of tutti-frutti caused no change in cell division rate. In addition, doses of both flavorings and treatments combining these solutions induced cell aberrations in a significant number of cells to the A. cepa system. Therefore, under these analytical conditions, cookie flavoring and combined doses were cytotoxic and genotoxic, and tutti-frutti flavoring, although non-cytotoxic, demonstrated genotoxic action. 

scholarly journals Spatial differences in stoichiometry of EGR phosphatase and Microtubule-Associated Stress Protein 1 control root meristem activity during drought stress.

2021 ◽  
Author(s):  
Toshisagba Longkumer ◽  
Chih-Yun Chen ◽  
Marco Biancucci ◽  
Bhaskara Govinal Badiger ◽  
Paul E. Verslues
Keyword(s):  
Cell Division ◽  
Cell Size ◽  
Cell Expansion ◽  
Growth Regulation ◽  
Root Meristem ◽  
Stress Protein ◽  
Root Cell ◽  
Root Cortex ◽  
Meristem Cell ◽  
Meristem Size

During moderate severity drought and low water potential (Ψw) stress, poorly understood signaling mechanisms restrict both meristem cell division and subsequent cell expansion. We found that the Clade E Growth-Regulating 2 (EGR2) protein phosphatase and Microtubule Associated Stress Protein 1 (MASP1) differed in their stoichiometry of expression across the root meristem and had opposing effects on root meristem activity at low Ψw. Ectopic MASP1 or EGR expression increased or decreased, respectively, root meristem size and root elongation during low Ψw stress. This, along with the ability of phosphomimic MASP1 to overcome EGR suppression of root meristem size and observation that ectopic EGR expression had no effect on unstressed plants, indicated that during low Ψw EGR activation and attenuation of MASP1 phosphorylation in their overlapping zone of expression determines root meristem size and activity. Ectopic EGR expression also decreased root cell size at low Ψw. Conversely, both the egr1-1egr2-1 and egr1-1egr2-1masp1-1 mutants had similarly increased root cell size; but, only egr1-1egr2-1 had increased cell division. These observations demonstrated that EGRs affect meristem activity via MASP1 but affect cell expansion via other mechanisms. Interestingly, EGR2 was highly expressed in the root cortex, a cell type important for growth regulation and environmental response.

Partial synchronization of cell division in root meristem induced by 5-aminouracil

1979 ◽  
Vol 21 (1) ◽  
pp. 51-56 ◽  
Author(s):  
F. J. Novák ◽  
Květuše Schwammenhöferová ◽  
Jarmila Čihalíková ◽  
M. Ondřej
Keyword(s):  
Cell Division ◽  
Root Meristem ◽  
Partial Synchronization ◽  
Synchronization Of Cell Division

scholarly journals Effects of Osmotic Stress on Cell Division of Root Meristem.

CYTOLOGIA ◽  
1997 ◽  
Vol 62 (2) ◽  
pp. 143-150 ◽  
Author(s):  
J. G. Seijo ◽  
A. L. Ramos ◽  
S. Sato
Keyword(s):  
Cell Division ◽  
Osmotic Stress ◽  
Root Meristem

Nickel effect on root-meristem cell division in Plantago lanceolata (Plantaginaceae) seedlings

2017 ◽  
Vol 65 (5) ◽  
pp. 446 ◽  
Author(s):  
Dolja Pavlova
Keyword(s):  
Cell Division ◽  
Mitotic Index ◽  
Root Meristem ◽  
Plantago Lanceolata ◽  
Nuclear Material ◽  
Root Tip ◽  
Dependent Manner ◽  
Meristem Cell ◽  
Anaphase Bridges ◽  
Tip Cells

The toxic effect of nickel (Ni) on cell division on root-meristem cells in seedlings of Plantago lanceolata L. was studied and compared. Seed material was collected from serpentine and non-serpentine populations of the species distributed in the Rhodope Mountains, Bulgaria. The root-tip meristem cells of germinated seeds were treated with different solutions of 0.01, 0.025, 0.05, 0.1 mM Ni as NiSO4 6H2O with distilled water for 24 h and 48 h respectively. The mitotic index decreased when Ni concentrations and exposure time increased in both type of samples. Significant differences in the mitotic indexes were found between the controls and the roots treated with Ni. The mitotic index was higher in root-meristem cells of serpentine seedlings. C-mitosis, anaphase bridges, chromosome stickiness, laggards and extrusion of nuclear material into the cytoplasm were observed in the root-tip cells treated with Ni. The percentage of aberrations generally increased in a concentration- and time-dependent manner. The percentage of the extruded nuclei was higher in cells treated with 0.05 and 0.1 mM Ni. It can be concluded that P. lanceolata seedlings on serpentine can tolerate higher Ni concentrations than can non-serpentine seedlings.

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