Growth Responses of Gibberellin-Treated Celery Plants
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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.Keywords:
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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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Plant Physiology
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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.
Gibberellic acid
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Effect of gibberellic acid (GA 3 ) on leaf sheath elongation in a normal (cv. Møystad) and a gibberellin(GA)‐insensitive (cv. Siete Cerros) genotype of wheat ( Triticum aestivum L.) were studied at 18 and 12°C under short (SD, 12 h) or long (LD, 24 h) photoperiod. Leaf sheath length in cv. Møystad was signficantly increased by exogenous GA 3 both under SD and LD. LD alone stimulated leaf sheath elongation and the combined effect of LD and GA 3 was additive, and there was no statistically signficant interaction between photoperiod and GA 3 concentrations. Leaf sheath length in cv. Siete Cerros was not significantly affected by GA 3 under any conditions. However, there was a highly significant stimulation of leaf sheath elongation by LD in cv. Siete Cerros as well. These results indicate that stimulation of elongation growth in wheat leaves by LD is not mediated by gibberellin.
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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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The role of applied gibberellic acid (GA 3 ) and endogenous gibberellins in the dormancy requirement of the cranberry Vaccinium macrocarpon Ait. cult McFarlin was investigated. Application of GA 3 to unchilled dormant plants resulted in only vegetative growth of the terminal buds. Extraction and bioassay of gibberellin-like substances from both terminal buds and leaves during the 1969–70 season indicate a translocation of these substances from leaves to terminal buds between March 9 and April 6. This coincided with the time of elongation of the terminal buds in the field. The timing of this translocation suggests that these gibberellin-like substances do not play an important role in flower-bud development at this stage.
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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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