scholarly journals MOVEMENT OF GROWTH REGULATORS IN PLANTS. I. POLAR TRANSPORT OF 2,4-DICHLOROPHENOXYACETIC ACID IN SEGMENTS FROM THE PETIOLES OF PHASEOLUS VULGARIS

1963 ◽  
Vol 62 (1) ◽  
pp. 3-18 ◽  
Author(s):  
C. C. McCREADY
Keyword(s):  
Phaseolus Vulgaris ◽  
Growth Regulators ◽  
Dichlorophenoxyacetic Acid ◽  
Polar Transport ◽  
2,4 Dichlorophenoxyacetic Acid

Phytotropins. IV. Effect of Phytotropins on Cultured Plant Cells and Protoplasts

1982 ◽  
Vol 9 (3) ◽  
pp. 297 ◽  
Author(s):  
PJ Larkin ◽  
W Scowcroft ◽  
AE Geissler ◽  
GF Katekar
Keyword(s):  
Petunia Hybrida ◽  
Cultured Cells ◽  
Plant Cells ◽  
Dichlorophenoxyacetic Acid ◽  
Polar Transport ◽  
Suspension Cultured Cells ◽  
Specific Receptors ◽  
Nicotiana Debneyi ◽  
2,4 Dichlorophenoxyacetic Acid

The phytotropins l-(2'-carboxyphenyl)-3-phenylpropane-1,3-dione (CPP) and 5-(2-carboxyphenyl)- 3-phenylpyrazole (CPD) reduced the net efflux of radiolabel from suspension-cultured cells treated with [14C]2,4-dichlorophenoxyacetic acid when present at concentrations comparable to those that inhibit polar transport of auxins in bean petioles. These phytotropins stimulated division of protoplasts of both Nicotiana debneyi and Petunia hybrida at concentrations of exogenous auxins that were otherwise suboptimal for divisions. The results are consistent with the proposal that phytotropins interact with specific receptors to reduce auxin efflux, resulting in increased intracellular auxin concentrations.

EXPERIMENTS ON THE RELATIVE SUSCEPTIBILITY OF WEEDS TO AUXIN HERBICIDES

1962 ◽  
Vol 40 (11) ◽  
pp. 1401-1409 ◽  
Author(s):  
J. R. Hay
Keyword(s):  
Phaseolus Vulgaris ◽  
Root Formation ◽  
Effective Control ◽  
Inorganic Salts ◽  
Dichlorophenoxyacetic Acid ◽  
Functional Importance ◽  
Molecular Configuration ◽  
Auxin Herbicides ◽  
Chlorophenoxyacetic Acid ◽  
2,4 Dichlorophenoxyacetic Acid

Sections of stems of Silene cucubalus, Galeopsis tetrahit, and Phaseolus vulgaris were cultured under sterile conditions in media containing inorganic salts, sucrose, agar, and the herbicides 2-methyl, 4-chlorophenoxyacetic acid, 2,4-dichlorophenoxyacetic acid, or 2-(2,4,5-trichlorophenoxy)propionic acid. The herbicide which gave the most effective control of a species under field conditions was also the most active in inducing root formation and proliferation on stem sections of that species. The response of the sections to these auxin herbicides diminished as the plants from which the sections were taken became more mature. The amount of herbicide recovered from treated shoots of these species was not correlated with susceptibility. It is postulated that susceptibility to these materials depends upon (i) the affinity of the species for the molecular configuration of the herbicide and (ii) the relative amount and functional importance of the susceptible tissues at the time of treatment.

scholarly journals Response of pine hypocotyl sections to growth regulators and related substances

2015 ◽  
Vol 44 (1) ◽  
pp. 123-132
Author(s):  
J. Zakrzewski
Keyword(s):  
Acetic Acid ◽  
Growth Regulators ◽  
Growth Response ◽  
Extended Period ◽  
Dichlorophenoxyacetic Acid ◽  
Pinus Silvestris ◽  
Related Substances ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Indole 3 Acetic Acid ◽  
Synthetic Growth

Growth response of <i>Pinus silvestris</i> hypocotyl sections to some synthetic growth regulators and related substances was studied. Elongation of hypocotyl sections was stimulated by naphtaleneacetic acid, indole-3-acetic acid, in-dole-3-propionic acid, indole-3-butyric acid, 2,4-dichlorophenoxyacetic acid, indoleaoetic amide, indoleacetic nitrile and coumarin. Indole-3-acetic acid and naphtaleneacetic acid extended period of growth up to 16 and 24 hours, respectively. Growth was inhibited by kinetin, trans-cinnamic acid and 2,3,5-tri-iodobenzoic acid. No effect of gibberellic acid, tryptophan and biotin was observed.

scholarly journals Comparison of foliar fertilizers and growth regulators on pre-harvest drop and fruit quality of ‘Thompson Navel’ orange

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Yaser Mollapur ◽  
Seied Mehdi Miri ◽  
Ebrahim Hadavi
Keyword(s):  
Salicylic Acid ◽  
Citric Acid ◽  
Growth Regulators ◽  
Fruit Quality ◽  
Calcium Nitrate ◽  
Dichlorophenoxyacetic Acid ◽  
Navel Orange ◽  
Fruit Decay ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Old Trees

AbstractAn investigation was carried out to determine the ability of foliar fertilizers and growth regulators to prevent pre-harvest drop and enhance navel orange fruit quality. Fifteen year old trees of the Thompson Navel orange variety were sprayed with aqueous solutions of one of the following: methanol (0.13%), calcium nitrate (0.25%), zinc sulfate (1%) + urea (0.5%), fermented sugar- cane extract (2.8%), salicylic acid (1 or 3 mM), citric acid (5 mM), or 2,4-dichlorophenoxyacetic acid (2,4-D) (0.002%). Results indicated that foliar treatment with 2,4-D reduced fruit drop (2.6%) as compared to the control (15.2%). Fruit decay was delayed and flavor improved by 5 mM citric acid. Weight loss was reduced after 3mM salicylic acid applica- tion, while methanol (0.13%), salicylic acid (1 and 3 mM) and citric acid (5 mM) caused a delay in fruit coloring.

The Transport Behaviour of the Synthetic Auxin 2,4-Dichlorophenoxyacetic Acid in Decapitated Seedlings of Sunflower (Helianthus annuus L.)

1982 ◽  
Vol 9 (1) ◽  
pp. 5 ◽  
Author(s):  
BT Brown ◽  
JN Phillips
Keyword(s):  
Transport System ◽  
Apical Dominance ◽  
Transport Process ◽  
Dichlorophenoxyacetic Acid ◽  
Loading Capacity ◽  
Polar Transport ◽  
Synthetic Auxin ◽  
Transport Behaviour ◽  
Auxin Polar Transport ◽  
2,4 Dichlorophenoxyacetic Acid

The transport behaviour of the synthetic auxin 2,4-dichlorophenoxyacetic acid (2,4-D), applied in aqueous solution to the cut stem surface of sunflower seedlings decapitated in the epicotyl, was studied using steam-ringing to differentiate between apoplastic and symplastic movement. Initially the 2,4-D moved in apoplastic tissue and was distributed rapidly throughout the plant, apparently as the result of a non-auxin-specific transport process. When an amount of 2,4-D sufficient to maintain apical dominance in the decapitated seedling was applied, the initially distributed material was subsequently redistributed acropetally in the stem apoplast and accumulated in the stump apex. When a lower level of 2,4-D, insufficient to maintain apical dominance, was applied, the initially distributed material was redistributed basipetally in the stem symplast, probably via the auxin polar transport system, and accumulated in the root. It is suggested that the 2,4-D loading capacity of the polar transport system is an important factor determining both the transport behaviour of the 2,4-D and its ability to maintain apical dominance in this system.

scholarly journals Differential regulation of GS-GOGAT gene expression by plant growth regulators in Arabidopsis seedlings

2016 ◽  
Vol 68 (2) ◽  
pp. 399-404 ◽  
Author(s):  
Milan Dragicevic ◽  
Ana Simonovic ◽  
Milica Bogdanovic ◽  
Angelina Subotic ◽  
Nabil Ghalawenji ◽  
...  
Keyword(s):  
Plant Growth ◽  
Plant Growth Regulators ◽  
Growth Regulators ◽  
Expression Patterns ◽  
Nuclear Gene ◽  
Glutamate Synthase ◽  
Ammonium Assimilation ◽  
Dichlorophenoxyacetic Acid ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
The Impact

Primary and secondary ammonium assimilation is catalyzed by the glutamine synthetase-glutamate synthase (GS-GOGAT) pathway in plants. The Arabidopsis genome contains five cytosolic GS1 genes (GLN1;1 - GLN1;5), one nuclear gene for chloroplastic GS2 isoform (GLN2), two Fd-GOGAT genes (GLU1 and GLU2) and a GLT1 gene coding for NADH-GOGAT. Even though the regulation of GS and GOGAT isoforms has been extensively studied in response to various environmental and metabolic cues in many plant species, little is known about the effects of phytohormones on their regulation. The objective of this study was to investigate the impact of representative plant growth regulators, kinetin (KIN), abscisic acid (ABA), gibberellic acid (GA3) and 2,4-dichlorophenoxyacetic acid (2,4-D), on the expression of A. thaliana GS and GOGAT genes. The obtained results indicate that GS and GOGAT genes are differentially regulated by growth regulators in shoots and roots. KIN and 2,4-D repressed GS and GOGAT expression in roots, with little effect on transcript levels in shoots. KIN affected all tested genes; 2,4-D was apparently more selective and less potent. ABA induced the expression of GLN1;1 and GLU2 in whole seedlings, while GA3 enhanced the expression of all tested genes in shoots, except GLU2. The observed expression patterns are discussed in relation to physiological roles of investigated plant growth regulators and N-assimilating enzymes.

scholarly journals PERTUMBUHAN KALUS DAUN MELON (Cucumis melo) VARIETAS MAI 119 DENGAN PEMBERIAN BAP (BENZYL AMINO PURINE) DAN 2,4-D (2,4 DICHLOROPHENOXYACETIC ACID)

2017 ◽  
Vol 1 (2) ◽  
Author(s):  
Nining Intan Toharah ◽  
Dwi Soelistya Dyah Jekti ◽  
Lalu Zulkifli
Keyword(s):  
Growth Regulators ◽  
Callus Induction ◽  
Cucumis Melo ◽  
Callus Formation ◽  
Dichlorophenoxyacetic Acid ◽  
Ms Medium ◽  
Randomized Design ◽  
Completely Randomized Design ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Benzyl Amino Purine

This study aims to determine the concentration of growth regulators BAP and   2,4-D which have the highest effect in stimulating the formation of callus melon plants (Cucumis melo) Mai 119 variety. Completely randomized design (CRD) was used in this research. Media used on callus induction was MS medium with addition of several concentration of BAP  (0 mg/L, 1 mg/L, 2 mg/L, 3 mg/L) and 2,4-D (0 mg/L, 1 mg/L, 2 mg/L, 3 mg/L) either alone or in a combination of both. Parameters measured were the time appearing of callus, callus diameter, callus texture, and callus color. Anova followed by Tukey's test was used to the analyse of time appearing of callus. Data of callus diameter was analyzed using Kruskal Wallis test followed by Mann-Whitney test. In the analysis of parameter related to the callus texture and callus color, descriptive test were used. The results showed that there were differences in the effect of growth regulators on the callus formation. The fastest callus induction and the largest diameter of callus were obtained on media with concentration of 2 mg/L BAP and 3 mg/L BAP.Keywords: BAP (benzyl amino purine), 2,4-D (2,4-dichlorophenoxyacetic acid), callus induction, melon (Cucumis melo) varieties Mai 119

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