scholarly journals Expression of Ornithine Decarboxylase Is Transiently Increased by Pollination, 2,4-Dichlorophenoxyacetic Acid, and Gibberellic Acid in Tomato Ovaries

1998 ◽  
Vol 118 (1) ◽  
pp. 323-328 ◽  
Author(s):  
David Alabadı́ ◽  
Juan Carbonell
Keyword(s):  
Gibberellic Acid ◽  
Ornithine Decarboxylase ◽  
Dichlorophenoxyacetic Acid ◽  
2,4 Dichlorophenoxyacetic Acid

Initiation and morphological development of somatic embryoids from barley cell cultures

1984 ◽  
Vol 62 (6) ◽  
pp. 1245-1249 ◽  
Author(s):  
L. S. Kott ◽  
K. J. Kasha
Keyword(s):  
Somatic Embryogenesis ◽  
Abscisic Acid ◽  
Gibberellic Acid ◽  
Cell Cultures ◽  
Dichlorophenoxyacetic Acid ◽  
Morphological Development ◽  
Low Concentrations ◽  
The Media ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Barley Cell

Somatic embryogenesis was induced in callus previously initiated from immature embryos of barley. These cultures ranged in age from 6 weeks to 30 months. Embryoids were readily initiated from homogenized suspension-grown aggregates when plated on modified B5 media with 2,4-dichlorophenoxyacetic acid. Low concentrations (0.1 and 0.05 mg∙L−1) of abscisic acid promoted further maturation of embryoids, while gibberellic acid (1 mg∙L−1) and kinetin (0.1 mg∙L−1) were used in the media to encourage embryoid germination. The development of somatic embryoids from initiation through maturation and germination is described.

scholarly journals Long-term Effect of Winter Gibberellic Acid Sprays and Auxin Applications on Crop Value of `Clausellina' Satsuma

2006 ◽  
Vol 131 (5) ◽  
pp. 586-592 ◽  
Author(s):  
Amílcar M.M. Duarte ◽  
Amparo García-Luis ◽  
Rosa Victoria Molina ◽  
Consuelo Monerri ◽  
Vicente Navarro ◽  
...  
Keyword(s):  
Gibberellic Acid ◽  
First Grade ◽  
Dichlorophenoxyacetic Acid ◽  
Flower Formation ◽  
Naphthaleneacetic Acid ◽  
Marginal Effect ◽  
Variable Effect ◽  
Long Term Effect ◽  
2,4 Dichlorophenoxyacetic Acid

A winter gibberellic acid (GA3) spray consistently reduced flower formation, but had a variable effect on the amount of first-grade fruit in the early harvest of `Clausellina' satsuma (Citrus unshiu Marc.), and in the long term these applications had no significant effect on the value of the crop. Auxin applications increased the amount of first grade-early harvested fruit, and increased crop value as compared to hand-thinned trees. No significant differences in yield or fruit grade could be found among the different auxin applications tried, namely an application of 20 mg·L-1 2,4-dichlorophenoxyacetic acid (2,4-D) at flowering, or applications of 25 mg·L-1 naphthaleneacetic acid (NAA), or 50 mg·L-1 2,4-dicholorophenoxypropionic acid (2,4-DP) at the end of fruitlet abscission. Apart from their effect on size, the auxin applications had only a marginal effect on fruit quality.

Tuber development, storage and germination in yams (Dioscorea spp.) in response to pre-harvest application of plant growth regulators

1984 ◽  
Vol 102 (2) ◽  
pp. 437-442 ◽  
Author(s):  
Lynda D. Wickham ◽  
H. C. Passam ◽  
L. A. Wilson
Keyword(s):  
Gibberellic Acid ◽  
Growth Regulators ◽  
Indole Acetic Acid ◽  
Foliar Application ◽  
Dichlorophenoxyacetic Acid ◽  
Tuber Development ◽  
Tuber Dormancy ◽  
Commercial Exploitation ◽  
Chinese Yam ◽  
2,4 Dichlorophenoxyacetic Acid

SummaryWhen pre-harvest foliar applications of growth regulators were made to vines of Dioscorea esculenta cv. Chinese Yam and D. alata cv. White Lisbon there were no obvious effects on tubers of D. alata, but dramatic effects on tuber development, storage and germination were obtained with D. esculenta tubers. Gibberellic acid caused marked extensions in tuber dormancy, 2,4-dichlorophenoxyacetic acid resulted in marked callus development, delayed germination and abnormal shoot and root development and indole acetic acid resulted in fingering of the tubers. It was concluded that there was potential for commercial exploitation of pre-harvest gibberellic acid treatments in extension of dormancy in Chinese Yam tubers and that the lack of response of D. alata tubers to foliar application of growth regulators warranted further investigation.

Effects of growth regulators and controlled atmosphere on stored carrots

1974 ◽  
Vol 82 (2) ◽  
pp. 245-249 ◽  
Author(s):  
M. Abdel-Rahman ◽  
F. M. R. Isenberg
Keyword(s):  
Gibberellic Acid ◽  
Growth Regulators ◽  
Dichlorophenoxyacetic Acid ◽  
Trimethylammonium Chloride ◽  
Controlled Atmosphere ◽  
Benzyl Adenine ◽  
Large Size ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Better Than

SummaryPreharvest sprays with 6-hydroxy-3-(2H)-pyridazinone (MH), or immersion in solutions of MH, 2,4-dichlorophenoxyacetic acid (2,4-D), 2-chloroethylphosphonic acid (ethephon), coumarin or (2-chloroethyl) trimethylammonium chloride (CCC) inhibited both sprouting and rooting of treated carrots during storage at 0 °C whencompared with water-dipped or untreated carrots, while N-6-benzyl-adenine (BA) dips stimulated extensive rooting and sprouting. In contrast, immersion in gibberellic acid (GA3) solutions had very little effect.Storage atmospheres containing 1, 2.5, 5 or 10% oxygen inhibited both sprouting and rooting but increased mould infection. Atmospheres containing 21% (air) or 40% oxygen reduced mould infection, but increased sprouting and rooting of stored carrots. Washing carrots in water before storage did not significantly affect mould infection, while washing in 0.5% clorox increased it. However, washing in water followed by immersion in MH inhibited both sprouting and rooting and also reduced mould infection. ‘Jumbo’ and large-size carrots stored better than medium and small carrots.

THE EFFECT OF MALEIC HYDRAZIDE ON SYNTHESIS OF LIGNIN

1964 ◽  
Vol 44 (3) ◽  
pp. 253-258 ◽  
Author(s):  
E. V. Parups
Keyword(s):  
Gibberellic Acid ◽  
Ferulic Acid ◽  
Ultraviolet Light ◽  
Light Absorption ◽  
Maleic Hydrazide ◽  
Lignin Content ◽  
Dichlorophenoxyacetic Acid ◽  
2,4 Dichlorophenoxyacetic Acid

The effect of maleic hydrazide and several other chemicals on the synthesis of lignin was investigated in oat coleoptile, pea hypocotyl, and tobacco. When measured by ultraviolet light absorption, maleic hydrazide depressed While 1,4-naphthoquinone increased the lignin content in the conducting tissues of oat coleoptile. The lignin content of oat coleoptiles treated with maleic hydrazide in presence of 1,4-naphthoquinone and tyrosine was reduced. Additions of ferulic acid generally overcame the effects of maleic hydrazide; p-benzoquinone was ineffective. Gibberellic acid and 2,4-dichlorophenoxyacetic acid generally promoted the synthesis of lignin. Joint use of these chemicals and maleic hydrazide produced intermediate levels of lignin. The hygroscopicity and filling value of flue-cured tobacco was related to the lignin content of the leaf.

Effects of Growth Regulators and Herbicides on Germination of Hydrilla Turions

Weed Science ◽  
1969 ◽  
Vol 17 (3) ◽  
pp. 299-301 ◽  
Author(s):  
Kerry K. Steward
Keyword(s):  
Gibberellic Acid ◽  
Growth Regulators ◽  
Phosphonic Acid ◽  
Indoleacetic Acid ◽  
Hydrilla Verticillata ◽  
Dichlorophenoxyacetic Acid ◽  
Napthaleneacetic Acid ◽  
Dimethyl Amine ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Germination And Growth

Turions of Hydrilla verticillata (Casp.) were treated with gibberellic acid (GA), napthaleneacetic acid (NAA), indoleacetic acid (1AA), 2-chloroethane phosphonic acid, 6,7-dihydrodipyrido(1,2,-a:2′, 1′-c)-pyrazinediium salts (diquat), 1,1′dimethyl-4,4′-bipyridinium salts (paraquat), mono-N,N-dimethylcocoamine salt of 7-oxabicyclo (2.2.1)heptane-2,3-dicarboxylic acid (cocoamine salt of endothall), or the dimethyl amine formulation of 2,4-dichlorophenoxyacetic acid (2,4-D). Germination and growth of subterranean turions was enhanced by GA and axillary turions by 1AA and 2,4-D. The herbicides exhibited little phytotoxicity to the propagules.

Response of pre-harvest drop of grapefruit on two rootstocks to 2,4-D, MCPA and gibberellic acid

1982 ◽  
Vol 22 (117) ◽  
pp. 337 ◽  
Author(s):  
RA Sarooshi
Keyword(s):  
Gibberellic Acid ◽  
Poncirus Trifoliata ◽  
Dichlorophenoxyacetic Acid ◽  
Phenoxyacetic Acid ◽  
Rough Lemon ◽  
Fruit Drop ◽  
South Wales ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Better Than

Several formulations, concentrations and timings of sprays of 2,4-D (2,4-dichlorophenoxyacetic acid) and MCPA (4-chloro-2-methyl phenoxyacetic acid) were tested for their ability to reduce pre-harvest drop of late hanging Marsh grapefruit growing on rough lemon (Citrus jambheri) and trifoliata (Poncirus trifoliata) rootstocks at Dareton in south-western New South Wales. Gibberellic acid was also tested in several timing combinations with 2,4-D for its ability to improve the quality of late hanging fruit. On rough lemon the established standard treatment of 2,4-D at 20 ppm applied in mid-May was as good or better than all other treatments. On trifoliata this standard spray was again as effective as all others in preventing drop up to mid-November, but a similar spray applied in midJune was more effective from mid-November to mid-December. MCPA applied at 10 or 20 ppm in mid-May was not as effective as the standard spray. The best treatments reduced the average cumulative fruit drop, of 39% on trifoliata and 70% on rough lemon, by at least a half. When gibberellic acid at 10 ppm was added to the standard mid-May spray of 2,4-D, or when it followed it in mid June, it improved the colour and appearance and reduced the rind thickness and puffiness of late hanging fruit.

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