scholarly journals Control of Flower Growth and Development by Gibberellic Acid

Nature ◽  
1969 ◽  
Vol 223 (5210) ◽  
pp. 1071-1071 ◽  
Author(s):  
G. P. HARRIS ◽  
B. JEFFCOAT ◽  
J. F. GARROD
Keyword(s):  
Gibberellic Acid ◽  
Growth And Development ◽  
Flower Growth

scholarly journals Brassinosteroids and gibberellic acid: effects on in vitro pollen germination in grapevine

OENO One ◽  
2017 ◽  
Vol 51 (3) ◽  
pp. 303
Author(s):  
Zeliha Gokbayrak ◽  
Hakan Engin
Keyword(s):  
Gibberellic Acid ◽  
Growth And Development ◽  
Pollen Germination ◽  
Table Grape ◽  
Basic Medium ◽  
Control Group ◽  
Plant Growth And Development ◽  
Physiological Processes ◽  
Grape Cultivars

<p style="text-align: justify;">Many physiological processes related to plant growth and development are under the influence of growth regulators, which also have an impact on pollen germination. In this study, the effects of two brassinosteroid compounds, epibrassinolide and 22S,23S-homobrassinolide, and gibberellic acid (GA<sub>3</sub>) on <em>in vitro</em> pollen germination of two table grape cultivars, ‘Italia’ and ‘Cardinal’ (<em>Vitis vinifera</em> L.), were determined. A total of 28 treatments, alone and in combination, were applied to freshly collected pollens which were sown on a basic medium with 1% agar and 20% sucrose. Petri dishes were kept at 26±1°C for 24 hours. Counting of the germinated pollens revealed that the effects of these plant hormones were cultivar- and substance-specific. The cultivar ‘Italia’ was not influenced by the treatments (the highest germination ratio being 44.4% from 0.001 mg L<sup>-1</sup> epibrassinolide) as opposed to the cultivar ‘Cardinal’. The highest germination ratio in ‘Cardinal’ was about 50% in pollens treated with 25 mg L<sup>-1</sup> GA<sub>3</sub> + 0.01 mg L<sup>-1</sup> epibrassinolide. The control group resulted in 32.38% germination. Combining GA<sub>3</sub> with epibrassinolide provided slightly higher germination ratios compared to combining GA<sub>3</sub> with 22S,23S-homobrassinolide. </p>

scholarly journals Gibberellic acid (GA3) affects growth and development of some selected kenaf (Hibiscus cannabinus L.) cultivars

2018 ◽  
Vol 118 ◽  
pp. 180-187 ◽  
Author(s):  
Sures Kumar M. Muniandi ◽  
Md. Aktar Hossain ◽  
Mohd. Puad Abdullah ◽  
Nor Aini Ab Shukor
Keyword(s):  
Gibberellic Acid ◽  
Growth And Development ◽  
Hibiscus Cannabinus

scholarly journals 233 Alteration of Flower Development and Fruit Growth in Summer Squash

HortScience ◽  
2000 ◽  
Vol 35 (3) ◽  
pp. 431C-431
Author(s):  
Jim E. Wyatt
Keyword(s):  
Gibberellic Acid ◽  
Flower Development ◽  
Growth And Development ◽  
Normal Growth ◽  
Sex Expression ◽  
Fruit Growth ◽  
Early Planting ◽  
Summer Squash ◽  
Measured Length ◽  
Days After Anthesis

Many summer squash hybrids initiate flowering by first producing one or more pistillate flowers before the development of any staminate flowers. These first pistillate flowers have no pollen source unless an earlier squash planting is nearby. The objectives of this study were to measure the loss in yield incurred by the absence of pollination and to determine if sex expression in squash could be altered by use of gibberellic acid (GA). `Cougar' summer squash was planted in 12 isolated plots on 13 May; four plots had adjacent rows planted on 3 May to provide pollen for the earliest developing pistillate flowers in those plots. On 28 May, 0.146 L·ha-1 of GA (ProGibb 4®) was applied to an adjacent row in four of the plots planted on 13 May. The four control plots received no treatment. At anthesis, pistillate and staminate flowers were counted daily for 10 days. The first six pistillate flowers that bloomed in each plot were identified and measured (length and diameter) on the day of anthesis, and at 4 and 7 days after anthesis. Fruit were harvested five times at 2-day intervals and data are reported on fruit ≤5.7 cm in diameter. GA had no effect on squash flowering habit. At 4 and 7 days after anthesis, fruit were smaller in plots where no pollen source was available. Early yields were higher for the first two harvests in plots where pollinators were present. A small, early planting of squash should be made to provide staminate flowers for normal growth and development of early fruit on the main summer squash crop.

Effect of plant hormones on the tRNA isoacceptor spectrum of wheat

2005 ◽  
Vol 53 (4) ◽  
pp. 377-384
Author(s):  
D. Szegő ◽  
E. Páldi ◽  
N. B. Loc ◽  
D. Lásztity
Keyword(s):  
Amino Acids ◽  
Plant Growth ◽  
Gibberellic Acid ◽  
Plant Hormones ◽  
Growth And Development ◽  
Plant Growth And Development ◽  
Wheat Seedlings ◽  
Stimulate Plant Growth

The plant hormones auxin, cytokinin and gibberellic acid, which stimulate plant growth and development, induce significant changes in the isoacceptor spectra of various tRNAs. The present experiments revealed that the treatment of wheat seedlings with auxin, cytokinin or gibberellic acid resulted in the appearance of new isoacceptors in the spectra of three tRNA groups specific for amino acids (methionine, tyrosine and valine). These new isoacceptors may be beneficial for the synthesis and regulation of the proteins induced by the plant hormones.

scholarly journals Exogenously Applied Gibberellic Acid Enhances Growth and Salinity Stress Tolerance of Maize through Modulating the Morpho-Physiological, Biochemical and Molecular Attributes

Biomolecules ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1005
Author(s):  
Kashif Shahzad ◽  
Sadam Hussain ◽  
Muhammad Arfan ◽  
Saddam Hussain ◽  
Ejaz Ahmad Waraich ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Antioxidant Enzymes ◽  
Salt Stress ◽  
Gibberellic Acid ◽  
Growth And Development ◽  
Foliar Spray ◽  
Seed Priming ◽  
Ion Concentration ◽  
Genes Expression ◽  
Antioxidant Enzymes Activities

Soil salinity is the major limiting factor restricting plant growth and development. Little is known about the comparative and combined effects of gibberellic acid (GA3) seed priming and foliar application on maize under salt stress. The current study determined the impact of different application methods of GA3 on morpho-physiological, biochemical and molecular responses of maize seedlings under three salinity stress treatments (no salinity, moderate salinity-6 dS m−1, and severe salinity-12 dS m−1). The GA3 treatments consisted of control, hydro-priming (HP), water foliar spray (WFS), HP + WFS, seed priming with GA3 (GA3P, 100 mg L−1), foliar spray with GA3 (GA3FS, 100ppm) and GA3P + GA3FS. Salt stress particularly at 12 dS m−1 reduced the length of shoots and roots, fresh and dry weights, chlorophyll, and carotenoid contents, K+ ion accumulation and activities of antioxidant enzymes, while enhanced the oxidative damage and accumulation of the Na+ ion in maize plants. Nevertheless, the application of GA3 improved maize growth, reduced oxidative stress, and increased the antioxidant enzymes activities, antioxidant genes expression, and K+ ion concentration under salt stress. Compared with control, the GA3P + GA3FS recorded the highest increase in roots and shoots length (19-37%), roots fresh and dry weights (31-43%), shoots fresh and dry weights (31-47%), chlorophyll content (21-70%), antioxidant enzymes activities (73.03-150.74%), total soluble protein (13.05%), K+ concentration (13-23%) and antioxidants genes expression levels under different salinity levels. This treatment also reduced the H2O2 content, and Na+ ion concentration. These results indicated that GA3P + GA3FS could be used as an effective tool for improving the maize growth and development, and reducing the oxidative stress in salt-contaminated soils.

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