Interaction of Gibberellic Acid and Indoleacetic Acid in Impatiens
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Abstract:
Gibberellic acid promotes doubling, early flowering, and fruiting directly in Impatiens. It also lengthens the stem, probably through a neutralization of auxin inhibitors. Such a mechanism would leave the growth-promoting auxins unchecked to produce the increased elongation characteristic of gibberellin application. It seems that application of additional auxin produces a rapid build-up of the auxin inhibitor(s) in the plant.Keywords:
Gibberellic acid
Elongation
Extensibility
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Gibberellic acid promotes doubling, early flowering, and fruiting directly in Impatiens. It also lengthens the stem, probably through a neutralization of auxin inhibitors. Such a mechanism would leave the growth-promoting auxins unchecked to produce the increased elongation characteristic of gibberellin application. It seems that application of additional auxin produces a rapid build-up of the auxin inhibitor(s) in the plant.
Gibberellic acid
Elongation
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Grape (Vitis vinifera L.) is one in every of the most precious fruit plants of temperate regions, but it is successfully grown in tropical and sub-tropical agro-climatic situations. This review is undertaken to evaluate the effects of gibberellic acid on the Quality and yield of grapes. The plant hormones are extraordinarily essential agents inside the integration of developmental activities. GA3 is also called gibberellic acid, but the term gibberellic is often used in describing all gibberellins. Active gibberellins show many physiological effects, each depending on the type of gibberellin present in the grape plant. This review Results suggest foliar sprays of only gibberellic acid (combine with different chemicals) with various concentrations at the different developmental stages, increases both quality and yield in grapes.
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Seven 14C-labelled compounds, including gibberellins A12(Ib), A13(IIc), and A14(IIIc), have been prepared and tested as precursors in the biosynthesis of gibberellic acid by Gibberella fujikuroi(see Table). It is suggested that gibberellic acid is biosynthesised from (–)-kaurene through 10β-formyl-1β,4aα-dimethyl-8-methylenegibbane-1 α-carboxylic acid (VIIIc) and gibberellin A14 or the corresponding 10-aldehyde (XV). Gibberellin A13 is not thought to be a precursor of gibberellic acid.Although several kaurene derivatives, (VIIa), (XIVc), and (XIVe), having the 16-methylene group, undergo ring contraction to gibbanes, e.g., (VIIIa), with base, those having a 16-keto-group, (VIIb) and (XIVd), do not. This appears to be due to a long-range effect associated with the 16-keto-group.
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Gibberellic acid
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Spraying celery plants with gibberellic acid (GA) resulted in differing growth responses to the different treatments, such as to suggest that the response exhibited was controlled more by the age of the plant at the time of spraying than by the dosage of GA applied.
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Treatment of peanuts with gibberellin changed the orientation of lateral branches of runners to that of erect ones, and two growth retardants changed those of the erect type to a more horizontal orientation. Little or no difference was found in amounts of endogenous gibberellin in the two types of plants, but amount of native gibberellic acid antagonists was higher in runner plants. Furthermore, runner plants contained a particular gibberellic acid inhibitor not found in erect plants. Applications of various auxins, antiauxins, and a cytokinin had no effect on tropistic growth of the side branches.
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Abstract Gibberellic acid and paclobutrazol (an inhibitor of endogenous gibberellin synthesis) were applied separately and in combination to young seedlings of Pseudopanax crassifolius (A. Cunn.) C. Koch in an attempt to induce the mature phase by the reduction of endogenous gibberellins. Exogenous gibberellins caused increased shoot extension and node formation and induced hyponasty in the juvenile leaves. Plants treated with paclobutrazol showed a severe inhibition of growth which was totally relieved by exogenous gibberellic acid. Treatment with paclobutrazol did not, however, induce any mature characteristics in the plants.
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Gibberellic acid promotes doubling, early flowering, and fruiting directly in Impatiens. It also lengthens the stem, probably through a neutralization of auxin inhibitors. Such a mechanism would leave the growth-promoting auxins unchecked to produce the increased elongation characteristic of gibberellin application. It seems that application of additional auxin produces a rapid build-up of the auxin inhibitor(s) in the plant.
Gibberellic acid
Elongation
Cite
Citations (5)