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Gibberellic acid

About: Gibberellic acid is a research topic. Over the lifetime, 6597 publications have been published within this topic receiving 109294 citations. The topic is also known as: GIBBERELLIN A3.


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Journal ArticleDOI
TL;DR: It is concluded that some step leading to flowering and which determines the differences in sensitivity of the buds to this growth regulator has taken place already at this early date.
Abstract: In the Satsuma mandarin (Citrus unshiu Marc.) the presence of the fruit results in a gradual inhibition of flowering and of bud sprouting. This inhibitory effect starts several months before the onset of the winter rest period and lasts until the end of the accumulation of carotenoids in the fruit peel, more than one month after the completion of fruit growth. During all this time and until natural bud sprouting, flowering and bud sprouting are inhibited by exogenous gibberellic acid. Peak responses to this growth regulator coincide with periods of maximal rates of flowering inhibition by the fruit. Kinetin and abscisic acid, applied at the time of peak response to gibberellic acid, inhibited flowering and reduced the number of shoots developed through the reduction of the number of shoots formed per sprouted node, but failed to reduce the number of nodes which sprouted. The same pattern of sprouting was obtained in trees treated with gibberellic acid during the winter rest period or several months earlier. It is concluded that some step leading to flowering and which determines the differences in sensitivity of the buds to this growth regulator has taken place already at this early date.

64 citations

01 Jan 2015
TL;DR: A hormone is a naturally produced chemical synthesized in one part of the plant and then travels to another part where it effects growth and development as mentioned in this paper, where it is used to control plant growth.
Abstract: A hormone is a naturally produced chemical synthesized in one part of the plant and then travels to another part where it effects growth and development. There are five main groups:  Auxin or Indole Acetic Acid (IAA)  Gibberellin or Gibberellic Acid (GA)  Cytokinin (Ck)  Ethylene (C2H4)  Abscisic Acid (AbA) Hormones discovered more recently include salicylic acid, jasmonates, brassinolides, etc. Plant growth regulators are man-made chemicals applied to plants to produce a desired effect (some are chemically identical to hormones).

64 citations

Journal ArticleDOI
01 Jul 1965-Botany
TL;DR: The levels of free phosphate and specific activity of 3′-nucleotidase, and ability to synthesize soluble protein between 24 and 48 hours, are markedly restricted in highly dormant embryos and GA can overcome these restrictions.
Abstract: Initiation of germination and subsequent growth of naked dormant embryos of Avena fatua L. require an exogenous source of sugar, amino acids, and gibberellic acid (GA). Non-dormant embryos can grow on sugar and amino acids, without exogenous GA, because they produce endogenously a gibberellin-like factor. This factor is absent in freshly matured dormant embryos but increases in amount with length of afterripening for several years, then decreases steadily. The action on embryos of exogenous GA and the endogenous GA-like factor is to promote the synthesis of enzymes or possibly to activate preformed enzymes necessary for the utilization of endosperm as the substrate for germination and growth. The levels of free phosphate and specific activity of 3′-nucleotidase, and ability to synthesize soluble protein between 24 and 48 hours, are markedly restricted in highly dormant embryos and GA can overcome these restrictions.

63 citations

Journal ArticleDOI
TL;DR: In this paper, the role of acid invertase in the provision of carbon substrates for cell growth was discussed in relation to the effect of light-growing plants on the development of Phaseolus vulgaris.
Abstract: In the stem of Phaseolus vulgaris L. the specific activity of acid invertase was highest in the most rapidly elongating internode. Activity of the enzyme was very low in internodes which had completed their elongation, in young internodes before the onset of rapid elongation, and in the apical bud. From shortly after its emergence from the apical bud the elongation of internode 3 was attributable mainly to cell expansion. Total and specific activities of acid invertase in this internode rose to a maximum at the time of most rapid elongation and then declined. Transfer of plants to complete darkness, or treatment of plants with gibberellic acid (GA3), increased the rate of internode elongation and final internode length by stimulating cell expansion. Both treatments rapidly increased the total and specific activities of acid invertase in the responding internodes; peak activities of the enzyme occurred at the time of most rapid cell expansion. In light-grown plants, including those treated with GA3, rapid cell and internode elongation and high specific activities of acid invertase were associated with high concentrations of hexose sugar and low concentrations of sucrose. As cell growth rates and invertase activities declined, the concentration of hexose fell and that of sucrose rose. In plants transferred to darkness, stimulated cell elongation was accompanied by a rapid decrease in hexose concentration and the disappearance of sucrose, indicating rapid utilization of hexose. No sucrose was detected in the apical tissues of light-grown plants. The results are discussed in relation to the role of acid invertase in the provision of carbon substrates for cell growth.

63 citations

Journal ArticleDOI
TL;DR: Investigation at whole plant level by treatment of Catharanthus roseus with gibberellic acid revealed that 14C distribution in leaf, stem, and root of treated plants was higher than in untreated and variations were observed in contents of metabolites as sugars, amino acids, and organic acids.
Abstract: Changes in growth parameters, carbon assimilation efficiency, and utilization of 14CO2 assimilate into alkaloids in plant parts were investigated at whole plant level by treatment of Catharanthus roseus with gibberellic acid (GA). Application of GA (1 000 g m−3) resulted in changes in leaf morphology, increase in stem elongation, leaf and internode length, plant height, and decrease in biomass content. Phenotypic changes were accompanied by decrease in contents of chlorophylls and in photosynthetic capacity. GA application resulted in higher % of total alkaloids accumulated in leaf, stem, and root. GA treatment produced negative phenotypic response in total biomass production but positive response in content of total alkaloids in leaf, stem, and roots. 14C assimilate partitioning revealed that 14C distribution in leaf, stem, and root of treated plants was higher than in untreated and variations were observed in contents of metabolites as sugars, amino acids, and organic acids. Capacity to utilize current fixed 14C derived assimilates for alkaloid production was high in leaves but low in roots of treated plants despite higher content of 14C metabolites such as sugars, amino acids, and organic acids. In spite of higher availability of metabolites, their utilization into alkaloid production is low in GA-treated roots.

63 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023203
2022406
2021133
2020153
2019165
2018196