Studies on the control of mitotic activity: the effect of respiratory inhibitors on mitotic cycle time in the root meristem of Pisum sativum

Chromosoma ◽  
1962 ◽  
Vol 13 (1) ◽  
pp. 39-46 ◽  
Author(s):  
J. Van't Hof ◽  
G. B. Wilson
Keyword(s):  
Pisum Sativum ◽  
Mitotic Activity ◽  
Cycle Time ◽  
Mitotic Cycle ◽  
Root Meristem ◽  
Respiratory Inhibitors

Evénements structuraux et métaboliques dans les entre-nœuds des bourgeons axillaires du pois, en réponse à la levée de dominance

1978 ◽  
Vol 56 (10) ◽  
pp. 1213-1228 ◽  
Author(s):  
Arlette Nougarède ◽  
Pierre Rondet
Keyword(s):  
Cell Growth ◽  
Pisum Sativum ◽  
Mitotic Activity ◽  
Dna Content ◽  
Apical Dominance ◽  
Mitotic Cycle ◽  
Homogeneous Reaction ◽  
Basal Portion ◽  
Elongation Phase ◽  
Synthetic Phase

Events associated with the release from dominance are described for internodes 1 and 2 of the axillary buds of Pisum sativum. During the inhibited state, most of the nuclei are found in the G1 phase of a diploid cycle. At the release from dominance, some nuclei in the G2 phase during inhibition enter into mitosis and the nuclei in G1 enter into the DNA synthetic phase. Until the 3rd day, a homogeneous reaction is registered for the whole of the two first internodes. Three maxima of mitotic activity are detected in the epidermis, the cortex, and the procambium and only one in the pith. From the 3rd day, the mitoses are localized at the uppermost part of these internodes: meanwhile, elongation occurs in their basal portion. At this level, the nuclear volumes are maximal at the 6th day. After release from apical dominance, the increase in DNA content reflects the resumption of the mitotic cycle and, subsequently, the onset of differentiation, with 4C level nuclei in the cortex and 8C nuclei in the pith. The cell growth of the epidermis, the cortex, and the pith, either radial or tangential, precedes the elongation phase.

scholarly journals The Mitotic Cycle time of Root Meristem Cells ofHelianthus Annuus

Caryologia ◽  
1969 ◽  
Vol 22 (4) ◽  
pp. 331-337 ◽  
Author(s):  
Jordanka Georgieva Todorova ◽  
Vittoria Nuti Ronchi
Keyword(s):  
Cycle Time ◽  
Mitotic Cycle ◽  
Root Meristem

scholarly journals The Mitotic Cycle Time of Root Meristem Cells ofHordeum Vulgare

Caryologia ◽  
1972 ◽  
Vol 25 (4) ◽  
pp. 439-444 ◽  
Author(s):  
M. D. Bennett ◽  
R. A. Finch
Keyword(s):  
Cycle Time ◽  
Mitotic Cycle ◽  
Root Meristem

scholarly journals Study of Mitotic Activity and Chromosomal Behaviour in Root Meristem of Allium cepa L. Treated with Magnesium Sulphate

2009 ◽  
Vol 15 ◽  
pp. 83-88 ◽  
Author(s):  
Prabhakar Bhatta ◽  
S. R. Sakya
Keyword(s):  
Key Words ◽  
Mitotic Activity ◽  
Allium Cepa ◽  
Biological System ◽  
Magnesium Sulphate ◽  
Root Meristem ◽  
Chromosomal Abnormalities ◽  
Inhibitory Effect ◽  
Duration Of Treatment ◽  
Chromosomal Behaviour

The mitotic activity and chromosomal behaviour was observed in four different concentrations of magnesium sulphate at four different duration of treatment using Allium cepa as a biological system. Mito-inhibitory effect of the compound was observed in higher concentration. The compound was capable of producing various chromosomal abnormalities indicating the cytostatic and clastogenic properties of magnesium sulphate. Key words: Allium cepa, magnesium sulphate, mitotic index, phase indices.doi: 10.3126/eco.v15i0.1947 ECOPRINT 15: 83-88, 2008

scholarly journals Increased rRNA gene activity during a specific window of early pea leaf development.

1990 ◽  
Vol 10 (2) ◽  
pp. 842-845 ◽  
Author(s):  
S R Baerson ◽  
L S Kaufman
Keyword(s):  
Pisum Sativum ◽  
Mitotic Activity ◽  
Gene Transcription ◽  
Leaf Development ◽  
Gene Activity ◽  
Striking Similarity ◽  
Rrna Gene

rRNA gene transcription rates were determined during light-mediated leaf development in Pisum sativum. The rate of transcription was observed to increase within 1 day of exposure to light and return to control levels 4 days after exposure. A striking similarity was observed between periods of elevated rRNA gene transcription and increased mitotic activity, suggesting a possible link between the two events.

scholarly journals Bystander effect formation in the sprout root meristem in condition of irradiated and non-irradiated seeds joint growing

2018 ◽  
Vol 22 ◽  
pp. 28-33
Author(s):  
O. Yu. German
Keyword(s):  
Statistical Analysis ◽  
Gamma Radiation ◽  
Mitotic Activity ◽  
Small Dose ◽  
Bystander Effect ◽  
Root Meristem ◽  
Activity Level ◽  
High Dose ◽  
Aqueous Environment ◽  
Cytogenetic Methods

Aim. To study the possibility of bystander effect inducing in the joint germination in a common aqueous environment of irradiated and non-irradiated seeds. Methods. Cytogenetic methods including mitotic activity level estimation, accounting for the number of nucleoli, and methods for statistical analysis of the data. Results. The effect of radiation stimulation with a dose of 40 Gy was dependent on the variety, and the effect of gamma radiation at a dose of 200 Gy reduced the level of mitotic activity in comparison with the control in both varieties. Mitotic indices increase in the meristem of non-irradiated seeds while growing with irradiated one. Conclusions. The bystander effect is formed on the organismic level under condition of growing of irradiated and non-irradiated seeds in a common aquatic environment and it is ma-nifested as an increase in the level of meristem cells proliferation and in the intensification of synthetic processes. The addition of irradiated with a high dose of gamma radiation seeds to the non-irradiated seeds induces an increase in mitotic activity largely than the addition of seeds irradiated with a relatively small dose. Keywords: bystander effect, radiation stimulation, mitotic activity, nucleoli.

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