Endoplasmic reticulum activity and cell wall breakdown in quiescent root meristems of Allium cepa L.

1972 ◽  
Vol 66 (3) ◽  
pp. 265-272 ◽  
Author(s):  
Arya K. Bal ◽  
Jeremiah F. Payne
2019 ◽  
pp. 71-78

EFECTOS DEL SORBATO DE POTASIO A DIFERENTES CONCENTRACIONES y TIEmPO DE ExPOSICIóN SOBRE EL CICLO CELULAR y EL mATERIAL GENÉTICO EN mERISTEmOS RADICULARES DE AllIuM CEPA l. (CEBOLLA) EFFECT OF POTASSIUm SORBATE AT DIFFERENT CONCENTRATIONS AND ExPOSURE TImE ON THE CELL CyCLE AND THE GENETIC mATERIAL IN ROOT mERISTEmS OF AllIuM CEPA l “ONION” Joselyne Quispe, José Saldaña, Tony Verde y Shirley Valderrama Universidad Nacional de Trujillo, Trujillo,Perú DOI: https://doi.org/10.33017/RevECIPeru2010.0011/ RESUMEN Con el propósito de determinar el efecto del Sorbato de Potasio sobre el ciclo celular en meristemos radiculares de Allium cepa L. “cebolla” se establecieron tres grupos experimentales que se expusieron a las soluciones de Sorbato de Potasio en concentraciones de 0.5, 1 y 2 g/L; por 6, 7 y 8 horas cada una y un grupo control. Luego se realizó la respectiva coloración en Orceína acética al 2% de acuerdo a la técnica de Tjio y Levan, observándose con el microscopio compuesto un total de 1500 células meristemáticas en cada uno de los tratamientos. Los resultados aplicando tratamiento después de 8 horas de exposición a la concentración de 2 g/L mostraron una disminución del índice mitótico de 11.26 %, mientras que se incrementó el índice profásico en 95.57 %. Se produjeron también alteraciones como rupturas cromosómicas, puentes anafásicos y células binucleadas. Las pruebas y análisis de varianza, mostraron diferencias significativas entre los diferentes tratamientos, confirmado mediante la prueba de comparación múltiple de promedios de Duncan. Se evidencia un probable efecto genotóxico en el material genético por el Sorbato de Potasio y una alteración en el ciclo celular de los meristemos de A. cepa L.; así mismo, se comprueba la función de biosensor de A. cepa L. en el estudio de sustancias que puedan afectar el ciclo celular. Palabras clave: Allium cepa, Sorbato de Potasio, Índice Mitótico, Alteración del material genético, Puentes anafásicos, Rupturas cromosómicas, Células binucleadas. ABSTRACT In order to determine the effect of Potassium Sorbate on the cell cycle in root meristems of Allium cepa L. “onion” set three experimental groups were exposed to solutions of Potassium Sorbate at concentrations of 0.5, 1 and 2g /l, for 6, 7 and 8 hours each and a control group. Later the respective color in 2% Acetic orcein according to the technique of Tjio and Levan, observed with the compound microscope a total of 1500 meristematic cells in each of the treatments. The appropriate treatment results after 8 hours of exposure to the concentration of 2 g / L showed a decrease in mitotic index of 11.26%, while it increased the rate at 95.57% prophasic index. There were also alterations as chromosome breaks, anaphasic bridges and binucleated cells. The tests and analysis of variance showed significant differences between the different treatments, as confirmed by multiple comparison test of Duncan averages. It shows a probable genotoxic effect in the genetic material by Potassium Sorbate and an alteration in the cell cycle of meristems of A. cepa L., likewise, is found biosensor function of A. cepa L. in the study of substances that may affect the cell cycle. Keywords: Allium cepa, Potassium Sorbate, Mitotic index, Abnormal genetic material, Chromosomal breaks, Anafasic bridges, Binucleated cells.


1998 ◽  
Vol 63 (1) ◽  
pp. 17-24 ◽  
Author(s):  
A. Ng ◽  
A.C. Smith ◽  
K.W. Waldron

2014 ◽  
Vol 56 (2) ◽  
pp. 201-207
Author(s):  
Maria Podbielkowska ◽  
Maria Wałęza ◽  
Mirosława Ważyńska

Specific changes in the activity of ATPases: mitochondrial and transport associated with the plasmalemma and membranes of endoplasmic reticulum have been observed during experiments on the meristematic tissue of <em>Allium cepa</em> root apices subject to cytostatics (methotrexate, cyclophosphamide, dacarbazine). It seems that an observed increase in the ATPase activity is correlated with a decrease in the level of cell respiration caused by oncostatics.


2014 ◽  
Vol 50 (4) ◽  
pp. 557-561 ◽  
Author(s):  
Maria Podbielkowska

Changes were found in the cell structure of the root meristems of <em>Haemanthus albiflos</em> and <em>Allium cepa</em> treated with methotrexate, an oncostatic preparation of the antimetabolite group. Root culture was conducted under anaerorbic conditions to induce In this way glycolysis typical for neoplastic cells. In <em>Haemanthus</em>, where the glycolytilc process runs normally, hypertrophy of the rough ER membranes noted correlated with the presence of numerous mitochondria and dictyasames with changed Structure. In <em>Allium</em> cells, where the glycalytic process runs with the participation of alliin, methotrexate did not evoke development of ER membranes. The structure of mitochondria and dictyosomes was similar as that in the root meristem of <em>Haemanthus</em>. In both studied objects thickening of the cell wall was noted.


1986 ◽  
Vol 57 (4) ◽  
pp. 565-575
Author(s):  
P.G. LLORET ◽  
P.J. CASERO ◽  
M.R. VIDAL ◽  
F. ABADIA-FENOLL ◽  
J. NAVASCUES

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