The role of endogenous cytokinins in correlation between cotyledon and its axillary bud and in hypocotyl regeneration of flax

1980 ◽  
Vol 22 (6) ◽  
pp. 434-437 ◽  
Author(s):  
J. Šebánek ◽  
Hoang Minh Tan ◽  
Jarmila Blazková
Keyword(s):  
Axillary Bud ◽  
Endogenous Cytokinins

Comparative analysis of the effect of epibrassinolide and 6-benzylaminopurine on the key components of the glutathione complex in the roots of wheat seedling under salinity.

Biomics ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 20-26
Author(s):  
D.R. Maslennikova ◽  
F.M. Shakirova
Keyword(s):  
Comparative Analysis ◽  
Wheat Seedling ◽  
Glutathione System ◽  
Glutathione S Transferase ◽  
Wheat Seedlings ◽  
Comparable Level ◽  
Endogenous Cytokinins ◽  
Main Components ◽  
First Time

The study carried out a comparative analysis of the effect of 24 epibrassinolide (EB) and 6-benzylaminopurine (BAP) on the growth and state of the main components of the glutathione system in the roots of wheat seedlings under the action of 2% NaCl, which for the first time revealed the ability of these phytohormones to similarly stabilize stress-induced decrease GSH / GSSG ratio, positively regulate the activity of glutathione reductase and glutathione-S-transferase. A comparable level of protective effect of BAP and EB on root length was revealed. The data obtained indicate that endogenous cytokinins may play the role of hormonal intermediates in the implementation of the protective.

scholarly journals Limitation of Cytokinin Export to the Shoots by Nucleoside Transporter ENT3 and Its Linkage with Root Elongation in Arabidopsis

Cells ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 350
Author(s):  
Alla Korobova ◽  
Bulat Kuluev ◽  
Torsten Möhlmann ◽  
Dmitriy Veselov ◽  
Guzel Kudoyarova
Keyword(s):  
Root Elongation ◽  
Zeatin Riboside ◽  
Mineral Nutrient ◽  
Endogenous Cytokinin ◽  
Nucleoside Transporter ◽  
Wild Type ◽  
Root Cells ◽  
Dna Insertion ◽  
Endogenous Cytokinins

The trans-membrane carrier AtENT3 is known to transport externally supplied cytokinin ribosides and thus promote uptake by cells. However, its role in distributing either exogenous or endogenous cytokinins within the intact plant has not hitherto been reported. To test this, we used ent3-1 mutant Arabidopsis seedlings in which the gene is not expressed due to a T-DNA insertion, and examined the effect on the concentration and distribution of either endogenous cytokinins or exogenous trans-zeatin riboside applied to the roots. In the mutant, accumulation of endogenous cytokinins in the roots was reduced and capacity to deliver externally supplied trans-zeatin riboside to the shoots was increased suggesting involvement of equilibrative nucleoside (ENT) transporter in the control of cytokinin distribution in the plants. Roots of ent3-1 were longer in the mutant in association with their lower cytokinin concentration. We concluded that the ENT3 transporter participates in partitioning endogenous cytokinins between the apoplast and the symplast by facilitating their uptake by root cells thereby limiting cytokinin export to the shoots through the xylem. Dilution of the mineral nutrient solution lowered endogenous cytokinin concentration in the roots of both wild type (WT) and ent3-1 plants accompanied by promotion of root elongation. Nevertheless, cytokinin content was lower, while roots were longer in the ent3-1 mutant than in the WT under either normal or deficient mineral nutrition suggesting a significant role of ENT3 transporter in the control of cytokinin level in the roots and the rate of their elongation.

scholarly journals Understanding the Role of Cytokinins in Tissue Proliferation of Rhododendron `Montego'

HortScience ◽  
1997 ◽  
Vol 32 (3) ◽  
pp. 447B-447
Author(s):  
Eric W. Mercure ◽  
Carol A. Auer ◽  
Mark H. Brand
Keyword(s):  
Multiple Shoots ◽  
Shoot Formation ◽  
Zeatin Riboside ◽  
Shoot Cultures ◽  
Tissue Proliferation ◽  
Exogenous Cytokinin ◽  
Endogenous Cytokinins ◽  
Extensive Degradation

Tissue proliferation (TP) is characterized primarily by the formation of galls or tumors at the crown of container-grown rhododendrons propagated in vitro. However, TP of Rhododendron `Montego' is observed initially in in vitro shoot cultures and it is characterized by the formation of multiple shoots with small leaves and nodal tumors. The formation of shoots in `Montego' TP (TP+) shoot cultures occurs without the presence of exogenous cytokinin in the medium, unlike normal `Montego' (TP–) shoot cultures, which require cytokinin for shoot growth. Structural studies have shown that tumors are composed of many adventitious buds and parenchyma cells, suggesting that TP is a result of abnormal cytokinin regulation that is controlling tumor and shoot formation. Two approaches are being used to determine if differences in cytokinin concentration and/or metabolism exist between TP+ and TP– shoot cultures. In the first approach, shoot cultures are grown in vitro for 1 week in the presence of tritiated isopentenyladenine (iP). Cytokinin uptake and metabolism are analyzed using HPLC and other analytical methods. Experiments suggest that extensive degradation and N-glucoside conjugation occur in TP+ and TP– shoots, resulting in the removal of most of the exogenous iP. In the second approach, the levels of endogenous cytokinins such as iP, isopentenyladenosine, zeatin, and zeatin riboside, are being measured in TP+ tumors and shoots and in TP– shoots by an ELISA method.

scholarly journals Role of Indoleacetic Acid and Abscisic Acid in the Correlative Control by Fruits of Axillary Bud Development and Leaf Senescence

1981 ◽  
Vol 68 (2) ◽  
pp. 476-481 ◽  
Author(s):  
Imre A. Tamas ◽  
Carol J. Engels ◽  
Stuart L. Kaplan ◽  
Jim L. Ozbun ◽  
Donald H. Wallace
Keyword(s):  
Abscisic Acid ◽  
Leaf Senescence ◽  
Indoleacetic Acid ◽  
Axillary Bud ◽  
Bud Development

Plant hormones and water stress

1976 ◽  
Vol 273 (927) ◽  
pp. 513-522 ◽  
Keyword(s):  
Abscisic Acid ◽  
Water Stress ◽  
Plant Hormones ◽  
Stomatal Closure ◽  
Stomatal Opening ◽  
Plant Water Relations ◽  
Plant Water ◽  
Endogenous Cytokinins ◽  
The Subject

In recent years, the involvement of plant hormones has become a subject of interest in plant water relations. The interest was initially stimulated by research into leaf ageing and plant senescence and the role of cytokinins in these processes. Plant water stress and some other stresses enhance senescence. They also bring about reduction in the levels of endogenous cytokinins. Exogenous cytokinins retard leaf senescence and may stimulate stomatal opening. Later, interest in the subject gained momentum from the various observations of the role of abscisic acid in stomatal opening. Abscisic acid brings about rapid stomatal closure, and its endogenous levels in leaves increase rapidly when plants are subjected to water stress or several other stresses. Hypotheses and data relevant to the possible role of hormones in plants subjected to environmental stresses are presented and discussed.

Sign in / Sign up

Export Citation Format

Share Document