Analytical determination of endogenous phytohormones - indolyl-3-acetic (IAA), gibberellic (GA3) and abscisic (ABA) acids and cytokinins - zeatin (Z), zeatin-O-glucoside (ZG), zeatinribozide (ZR), isopentenyladenine (iP) and isopentenyladenosine (iPA) were performed by high performance liquid chromatography - mass spectrometry (HPLC-MS). With GA3 treatment, plant height increased considerably, while with EW-250, it decreased. (edu.ua)
This study was designed to determine whether SWE-based cytokinins affect creeping bentgrass heat tolerance, and to compare effects of SWE-based cytokinins to those of a trans -zeatin riboside ( t -ZR)-standard. (bioagservicescorp.com)
2002) noted that root- zone-injection of zeatin riboside increased endogenous cytokinins, antioxidant activity, and delayed senescence in heat-stressed creeping bentgrass. (bioagservicescorp.com)
Exogenous5
These results imply of the role of exogenous factors such as cytokinins and auxins supplementation in affecting the terpenoid biogenesis in vitro by altering the levels of endogenous cytokinins and physiological status of the plant organism. (cas.cz)
It is shown that after treatment with exogenous GA3, the content of endogenous IAA and ABA decreased and GA3 in plant stems increased. (edu.ua)
Exogenous GA3 enhanced the accumulation of endogenous GA3 and IAA and inhibited ABA in the leaves. (edu.ua)
The obtained results showed that anatomical-morphological and structural-functional rearrangements of sweet pepper plants under the action of exogenous gibberellic acid and EW-250 took place against the background of changes in the balance and distribution of endogenous hormones. (edu.ua)
Exogenous 6-BA also increased root cytokinin level (Wang et al. (bioagservicescorp.com)
Growth regulators4
We report here on the effects of plant growth regulators on the terpenoid profile, structure of photosystem II in vitro as well as on the endogenous cytokinin levels of both above- and underground parts. (cas.cz)
It was revealed that the growth regulators-modified growth and development as well as the alterations of photosystem II structural organization were related to the cytokinin levels of Artemisia alba. (cas.cz)
Treatment of plants with the studied growth regulators caused a decrease in the pool of cytokinins (CK) in stems. (edu.ua)
Extensive research has identified cytokinins as a class of very effective antisenescence growth regulators (Woo et al. (bioagservicescorp.com)
Processes1
Thimann (1987) found that cytokinins delay senescence processes probably by maintaining the integrity of the tonoplast membrane. (bioagservicescorp.com)
Adenine derivatives2
Naturally occurring cytokinins are adenine derivatives with distinct substitutions attached to the N6position of the adenine ring ( Figure 1 ). (bioone.org)
Cytokinin groups a collection of N 6 -substituted adenine derivatives, including trans -zeatin ( t Z) and isopentenyladenine (iP). (nature.com)
Isoprenoid2
The most common class of cytokinins have isoprenoid side chains, including the most abundant cytokinin in Arabidopsis, trans-zeatin. (bioone.org)
The isoprenoid cytokinins ( t Z- or iP-types) showed similar distribution patterns in different cell type populations within the root apex 10 . (nature.com)
Play a role1
Since their discovery, cytokinins have been implicated to play a role in almost all aspects of plant growth and development, including cell division, shoot initiation and growth, leaf senescence, and photomorphogenic development ( Mok and Mok, 1994 ). (bioone.org)
Show1
Here, by detailed monitoring of subcellular localizations of the fluorescently labelled natural cytokinin probe and the receptor ARABIDOPSIS HISTIDINE KINASE 4 (CRE1/AHK4) fused to GFP reporter, we show that pools of the ER-located cytokinin receptors can enter the secretory pathway and reach the PM in cells of the root apical meristem, and the cell plate of dividing meristematic cells. (nature.com)
Plant3
In addition to the free base forms, cytokinins can also be present in the plant as a riboside (in which a ribose sugar is attached to the 9 nitrogen of the purine ring) or a ribotide (in which the ribose moiety contains a phosphate group). (bioone.org)
Plant hormone cytokinins are perceived by a subfamily of sensor histidine kinases (HKs), which via a two-component phosphorelay cascade activate transcriptional responses in the nucleus. (nature.com)
The plant hormone cytokinin regulates various cell and developmental processes, including cell division and differentiation, embryogenesis, activity of shoot and root apical meristems, formation of shoot and root lateral organs and others 1 . (nature.com)