Dormancy regulation: hormonal interaction in maple (Acer platanoides)

1969 ◽  
Vol 47 (7) ◽  
pp. 1165-1169 ◽  
Author(s):  
A. E. DeMaggio ◽  
J. A. Freeberg
Keyword(s):  
Abscisic Acid ◽  
Gibberellic Acid ◽  
Acid Treatment ◽  
Acer Platanoides ◽  
Sterile Culture ◽  
Hormonal Interaction ◽  
Bud Growth ◽  
Short Days ◽  
Gibberellic Acid Treatment

Whole buds and excised apices (bud scales removed) from dormant trees of Acer platanoides grow in sterile culture in long days but have different responses to gibberellic acid treatment. Bud growth is stimulated by the hormone in long and short days but apices are unaffected. Abscisic acid inhibits not only gibberellin-stimulated bud growth but also the photoperiodically stimulated growth of apices.

Response of Barley Shoot Apices to Application of Gibberellic Acid and Abscisic Acid: Dependence on Tissue Sensitivity

1978 ◽  
Vol 5 (5) ◽  
pp. 581 ◽  
Author(s):  
PB Nicholls
Keyword(s):  
Abscisic Acid ◽  
Gibberellic Acid ◽  
Acid Treatment ◽  
Apical Meristem ◽  
Internode Elongation ◽  
Shoot Apices ◽  
Tissue Sensitivity ◽  
Short Days ◽  
Gibberellic Acid Treatment ◽  
Acid Dependence

Stimulation by gibberellic acid of rachis internode elongation in barley grown in short days was dependent on either the timing of application or on the amount applied in a dose at day 10. There was no immediate rachis internode elongation in response to gibberellic acid treatment until floret initials appeared and then only if sufficient gibberellic acid was present in the shoot apices of the barley plants grown in short days. Applications of gibberellic acid promoted the growth of the double-ridge meristem (upper ridge only) and this resulted in a group of abnormal spikelets being formed on the lower six nodes of the inflorescence, all of which were characterized by enhanced growth of the rachilla apical meristem. In a 2 × 2 factorial experiment with gibberellic acid, abscisic acid was found to slightly reduce the growth rate of the vegetative barley apex between days 10 and 14. Abrupt cessation of primordium formation, coincident with the appearance of stamen initials, was observed following continued application of both gibberellic acid and abscisic acid whereas neither hormone alone had this effect. Enhanced growth of the rachilla apical meristem of the basal six spikelets following application of gibberellic acid resulted in the formation of branched inflorescences, and this result was not altered by the addition of abscisic acid to the treatment.

scholarly journals GIBBERELLIC ACID TREATMENT OF DACTYLIS GLOMERATA AND ITS RESIDUAL EFFECTS ON THE FOLLOWING GENERATION

1966 ◽  
Vol 46 (4) ◽  
pp. 367-370
Author(s):  
S. O. Fejer
Keyword(s):  
Gibberellic Acid ◽  
Acid Treatment ◽  
Dactylis Glomerata ◽  
Residual Effects ◽  
Dactylis Glomerata L ◽  
Short Days ◽  
Gibberellic Acid Treatment

Seed harvested from plants of Dactylis glomerata L. sprayed with gibberellic acid several weeks before the first signs of heading showed, after germination, a very marked increase in the top/root ratio of the seedlings. After various treatments with short days at contrasting temperatures most of these seedlings developed into plants that were taller and headed earlier.

scholarly journals The Influence of Flower Head Order and Gibberellic Acid Treatment on the Hydroxycinnamic Acid and Luteolin Derivatives Content in Globe Artichoke Cultivars

Foods ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 1813
Author(s):  
María José Giménez ◽  
Marina Giménez-Berenguer ◽  
María Emma García-Pastor ◽  
Joaquín Parra ◽  
Pedro Javier Zapata ◽  
...  
Keyword(s):  
Gibberellic Acid ◽  
Acid Content ◽  
Acid Treatment ◽  
Bioactive Compound ◽  
Hydroxycinnamic Acid ◽  
Flower Head ◽  
Globe Artichoke ◽  
Rp Hplc ◽  
Head Weight ◽  
Gibberellic Acid Treatment

Flower head orders and the use of GA3 (gibberellic acid) treatment could be two influencing factors determining the bioactive compound levels in artichoke, but little to no information is available about their effects. In this study, we have therefore evaluated the influence of these factors on the hydroxycinnamic acid and luteolin derivative levels in three categories of artichoke: Seed-propagated open-pollinated cultivars; vegetatively propagated cultivars; and seed-propagated hybrids. The hydroxycinnamic acids and luteolin derivatives were quantified by RP-HPLC-DAD. The average flower head weight was the lowest in tertiary heads and GA3-treated artichokes, followed by secondary and main heads. Moreover, the hydroxycinnamic acid and luteolin derivatives levels were significantly higher in tertiary heads than in secondary or main heads. In addition, the GA3 treatment significantly reduced the hydroxycinnamic acid content and, in contrast, improved luteolin derivatives levels. These effects depended on the flower head order and cultivar. Knowledge of the effects of flower head order and GA3 treatment is therefore key in order to achieve the greatest health-benefits from artichoke consumption.

The Bolting and Flowering of Chondrilla Juncea L. as Influenced by Temperature and Photoperiod

1968 ◽  
Vol 21 (5) ◽  
pp. 883 ◽  
Author(s):  
O H Caso ◽  
NP Kefford
Keyword(s):  
Gibberellic Acid ◽  
Acid Treatment ◽  
Stem Elongation ◽  
Controlled Conditions ◽  
Effects Of Temperature ◽  
Bolting And Flowering ◽  
Gibberellic Acid Treatment ◽  
Chondrilla Juncea

O. juncea plants were grown in a variety of controlled conditions to determine effects of temperature, photoperiod, and gibberellic acid treatment on stem elongation (bolting) and flowering.

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