scholarly journals Studied on Branching Habits in Crop Plants : 3. Effects of leaf removal or addition of gibberellic acid throuth leaf blade on the growth of tillering buds in rice seedlings.

1965 ◽  
Vol 33 (3) ◽  
pp. 247-254
Author(s):  
Kiichi HANADA
Keyword(s):  
Gibberellic Acid ◽  
Leaf Blade ◽  
Crop Plants ◽  
Leaf Removal ◽  
Rice Seedlings

Gibberellic Acid and the Growth of Crop Plants

Nature ◽  
1956 ◽  
Vol 178 (4546) ◽  
pp. 1356-1357 ◽  
Author(s):  
D. G. MORGAN ◽  
G. C. MEES
Keyword(s):  
Gibberellic Acid ◽  
Crop Plants

Activités physiologiques de l'ochracine, synthétisée par Septoria nodorum, sur la croissance de plantules de riz et sur la synthèse ‘de novo’ des alpha-amylases par les couches à aleurone du caryopse de blé. Interaction avec l'acide gibbérellique

1979 ◽  
Vol 57 (6) ◽  
pp. 561-567 ◽  
Author(s):  
G. Touraud ◽  
J. F. Bousquet
Keyword(s):  
Synergistic Effect ◽  
Gibberellic Acid ◽  
De Novo ◽  
Pathogenic Fungus ◽  
Septoria Nodorum ◽  
De Novo Synthesis ◽  
Rice Seedlings ◽  
Culture Filtrates ◽  
Increased Sensitivity ◽  
Tissue Permeability

Ochracine was isolated from culture filtrates of Septoria nodorum Berk. (Berk.), a pathogenic fungus of wheat. At concentrations ranging from 25 μg/mL it inhibited the growth of wheat and rice seedlings and the 'de novo' synthesis of α-amylases by the aleurone layers of wheat. These effects were not reversed by increased concentrations of gibberellic acid.Between 2.5 and 10 μg/mL, ochracine exhibited a synergistic effect with exogenous gibberellic acid on the same physiological phenomena. For these last concentrations, the results suggest an increased sensitivity of rice seedlings and wheat aleurone layers to exogenous gibberellic acid as a result of changes in tissue permeability.

A biological assay for gibberellic acid with rice seedlings

The Analyst ◽  
1959 ◽  
Vol 84 (997) ◽  
pp. 216 ◽  
Author(s):  
R. S. C. Aytoun ◽  
A. T. Dunn ◽  
D. A. L. Seiler
Keyword(s):  
Gibberellic Acid ◽  
Biological Assay ◽  
Rice Seedlings

Efficiency of different strategies for the control of grey mold on grapes including gibberellic acid (Gibb3), leaf removal and/or botrycide treatments

OENO One ◽  
2010 ◽  
Vol 44 (3) ◽  
pp. 151 ◽  
Author(s):  
Danièle Evers ◽  
Daniel Molitor ◽  
Melanie Rothmeier ◽  
Marc Behr ◽  
Serge Fischer ◽  
...  
Keyword(s):  
Gibberellic Acid ◽  
Control Strategies ◽  
Disease Incidence ◽  
Cluster Structure ◽  
Pinot Noir ◽  
Leaf Removal ◽  
Wine Quality ◽  
Additional Measure ◽  
Grey Mold ◽  
The Impact

<p style="text-align: justify;"><strong>Aim</strong>: The present work evaluated different strategies for the control of grey mold, caused by <em>Botrytis cinerea</em>, on wine grapes, including the use of the plant growth regulator Gibb3, leaf removal and/or botryticide treatments. The efficiency of the different control strategies (disease incidence and severity, yield) as well as the effect on the cluster structure was investigated.</p><p style="text-align: justify;"><strong>Methods and results</strong>: The trials were conducted in commercial vineyards in the Moselle Valley (Luxembourg) between the years 2007 and 2009, on the Pinot gris, Pinot blanc and Pinot noir grape varieties. The untreated control (T1) was compared to the following treatments : (T2) Gibb3, (T3) Gibb3 combined with leaf removal in the cluster zone after bloom, (T4) leaf removal after bloom combined with two times botryticides and (T5) Gibb3 combined with two times botryticides. The combination of Gibb3 with leaf removal or botryticide applications led to an efficiency level in grey mold reduction of around 60% and a decrease in cluster density when compared to the control. Moreover, we showed that the progression of grey mold disease was slowed down by the three treatments T3, T4 and T5.</p><p style="text-align: justify;"><strong>Conclusions</strong>: Gibberellic acid applied at full bloom as stand-alone treatment did not reduce in a significant way the compactness of the grape clusters and the impact on grey mold development was low. For a significant decrease of disease severity, gibberellic acid had to be combined with an additional measure, such as leaf removal or the use of botryticides. Based on its positive effect on cluster structure and microclimate, leaf removal can be recommended as a basic measure that can be further combined with an application of botryticides or gibberellic acid.</p><p style="text-align: justify;"><strong>Significance and impact of the study</strong>: All the tested strategies combining two measures have shown their potential to prolong the ripening period and therewith to improve wine quality. Moreover, the combined use of gibberellic acid and leaf removal represents a sustainable strategy for integrated viticulture due to its reduced input of organic-synthetic pesticides into the environment.</p>

scholarly journals RICE SEEDLING PERFORMANCE TREATED WITH GIBBERELLIC ACID AT DIFFERENT TEMPERATURES

2020 ◽  
Vol 22 (2) ◽  
pp. 84-90
Author(s):  
Luis Osmar Braga Schuch ◽  
Ivan Ricardo Carvalho ◽  
Cristian Troyjack ◽  
João Roberto Pimentel ◽  
Nata Balsan Moura ◽  
...  
Keyword(s):  
Gibberellic Acid ◽  
Acid Concentration ◽  
Dry Matter ◽  
Rice Seedling ◽  
Rice Cultivars ◽  
Rice Seedlings ◽  
Physiological Processes ◽  
Matter Production ◽  
Different Temperatures ◽  
Over Time

This work aimed to evaluate the initial performance of seedlings originated from seeds of rice cultivars treated with gibberellic acid and exposed to different growth temperatures. The cultivars SCS - 112, BRS 7-TAIM, BR IRGA 410 and IRGA 417 were used, soaked in concentrations of gibberellic acid of 0; 150; 300; 450; 600 and 750 mg L-1 and taken into germinator under temperatures of 15; 20 and 25oC. The evaluations were performed in relation to shoot and root of rice seedlings at 3; 7 and 21 days after sowing. The cultivars showed different dry matter production of shoot and root as gibberellic acid concentration, temperature and time of evaluation. The better initial performance of seedlings exposed to gibberellic acid shows the higher expression of the rice seeds vigor and demonstrates the superiority in efficiency of different physiological processes involved in the resumption of growth the embryo. Thus, gibberellic acid favors the growth of the rice seedlings over time.

scholarly journals Morphogenesis, pigment content, phytohormones and productivity of eggplants under the action of gibberellin and tebuconazole

2020 ◽  
Vol 11 (1) ◽  
pp. 116-122
Author(s):  
V. V. Rogach ◽  
L. V. Voytenko ◽  
M. M. Shcherbatiuk ◽  
I. V. Kosakivska ◽  
T. I. Rogach
Keyword(s):  
Acetic Acid ◽  
Gibberellic Acid ◽  
Growth Regulators ◽  
Leaf Blade ◽  
Dry Matter ◽  
Pigment Content ◽  
Raw Material ◽  
Sand Culture ◽  
Cultivated Plants ◽  
Indole 3 Acetic Acid

Regulation of growth and development of cultivated plants in order to optimize the production process is one of the main objectives of modern plant physiology. Both activators and growth inhibitors are used for this purpose. The effect of foliar treatment with 0.005% solution of gibberellic acid and 0.025% solution of antigibberellic preparation of tebuconazole on the morphogenesis, leaf structure, photosynthetic pigment content, balance of phytohormones and eggplant productivity cv. Diamond variety was investigated. The treatment with the preparations was carried out in the budding phase. The vegetation experiment was laid under soil and sand culture in vessels of a ten-liter capacity. The morphometric parameters were determined every 10 days, the mesostructure was studied in the leaves of the middle tier in the phase of fruit formation, chlorophyll content was measured in the raw material by spect­rophotometric method. Analytical determination of phytohormones (indole-3-acetic acid, gibberellic, abscisic acids and cytokinins – zeatin, zeatin-O-glucoside, zeatinriboside, isopentenyladenine and isopentenyladenosine) was performed by high performance liquid chromatography. Under the action of gibberellic acid, plant height increased significantly, and it decreased after its treatment with tebuconazole. The stimulator and inhibitor increased the number of leaves per plant, the weight of the leaf dry matter, the area of the individual leaf blade and the area of leaves per plant. Both preparations increased the weight of the raw material of the stems and roots, as well as the mass of dry matter of the whole plant. Under the action of tebuconazole, the content of chlorophylls in the leaves increased, while under the action of gibberellic acid it decreased. After treatment with gibberellic acid and tebuconazole, the thickness of the leaf blade increased due to chlorenchyma thickening. In the variant with gibberellic acid, the thickness of upper and lower epidermis increased, and in the variant with tebuconazole, these parameters decreased. Both growth regulators increased the volume of cells of the columnar parenchyma. The contet of endogenous gibberellic, indole-3-acetic and abscisic acids of the stems and especially in the leaves increased with the treatment of exogenous gibberellic acid, whereas after the application of tebuconazole the gibberellic and indole-3-acetic acid content of the stems decreased significantly and practically decreased to traces. Instead, the amount of abscisic acid increased. After treatment with exogenous gibberellic acid, the pool of cytokinins in the leaves significantly decreased. The inactive isoforms of the hormone zeatin-O-glucoside and isopentenyladenosine dominated in the stems. The effect of tebuconazole decreased the pool of cytokinins in the stems and increased in the leaves. In general, due to the multidirectional action, growth regulators positively influenced the elements of eggplant productivity. More effective was the retardant – tebuconazole. Therefore, the anatomic-morphological and structural-functional rearrangements in eggplants under the effects of exogenous gibberellic acid and tebuconazole are due to changes in the balance and distribution of endogenous hormones. Increased photosynthetic activity, stimulation of growth processes of some organs of the plant and inhibition of others enlarged the biological productivity of the culture.

Sign in / Sign up

Export Citation Format

Share Document