Topic
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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TL;DR: The observed changes in carbohydrate composition and enzyme activities indicate that GA3 induces a drastic change in potato tuber metabolism towards a pattern characteristic for the termination of the storage process.
Abstract: Potato plants (Solanum tuberosum L. cv. Ostara) were grown in aerated water culture in a controlled environment. When the tubers had reached a diameter of 1–3 cm. 14C-labelled or unlabelled gibberellic acid (GA3) was applied to the surface of the stolons at points approximately 1 crn from the developing tubers, and treatment continued for 10 days. - Significant quantities of GA3 moved into tuber tissue within 2–4 days of hormone application. This influx of GA3 was accompanied by a marked reduction in both the activity of ADPG-pyrophospharylase and the ratio ADPG-pyrophosphorylase/starch phosphorylase and an increase in the activity of UDPG-pyrophosphorylase. Starch phosphorylase activity initially increased slightly but then fell, whereas the activity of starch synthase remained constant throughout the experiment. The soluble sugar composition of the tubers changed qualitatively towards a pattern characteristic of growing stolon tips prior to tuber initiation, but there was no clear evidence of net starch degradation. Changes in the activities of the enzymes were observed prior to noticeable effects of the hormone on tuber growth rate or the development of new stolons at the tuber eyes. - GA3- treated tubers imported more 14C from labelled photosynthate than expected on the basis of growth rate. However, the capacity to convert solub#e-14C to ethaTiol-insoluble-14C (predominantly starch) was reduced in comparison with non-treated tubers. - The observed changes in carbohydrate composition and enzyme activities indicate that GA3 induces a drastic change in potato tuber metabolism towards a pattern characteristic for the termination of the storage process.
59 citations
TL;DR: It is shown that autumnal application of gibberellin prolongs dormancy of Vitis vinifera shoots in the following spring, and further observations on these plants this spring have shown that in many of them dormancy was prolonged.
Abstract: WEAVER1 has shown that autumnal application of gibberellin prolongs dormancy of Vitis vinifera shoots in the following spring. We2 recently reported that application of gibberellic acid in late summer and autumn delayed leaf-fall of several woody species; further observations on these plants this spring have shown that in many of them dormancy was prolonged. Thus this unexpected response to gibberellins may not be uncommon.
59 citations
TL;DR: An attempt to replace this by the application of β-indolylacetic acid to emasculated buds was ineffective—low concentrations having no effect and high concentrations (500 and 1,000 p.m.) causing inhibition of corolla growth.
Abstract: IN a previous communication1 I reported that emasculation of Glechoma hederacea flower buds resulted in a reduction in corolla size similar to that found in naturally occurring female flowers, and I suggested that the anthers produced a hormone causing enlargement of the corolla. An attempt to replace this by the application of β-indolylacetic acid to emasculated buds was ineffective—low concentrations having no effect and high concentrations (500 and 1,000 p.p.m.) causing inhibition of corolla growth.
59 citations
TL;DR: It is concluded that abscisic acid maintains dormancy by inhibiting the production of specific types of m-RNA, and therefore the formation of specific proteins.
Abstract: Abscisic acid maintains embryos in a state of dormancy and inhibits the incorporation of H3uridine and H3thymidine but not the incorporation of H3leucine. Ribosomes present in imbibed but dormant embryos do not become associated into polysomes until actual germination of the embryos. Protein synthesis still occurs in embryos when RNA synthesis is inhibited and therefore stable m-RNA must be present in dormant embryos. It is concluded that abscisic acid maintains dormancy by inhibiting the production of specific types of m-RNA, and therefore the formation of specific proteins. The activity of abscisic acid is antagonistic to the effect of gibberellic acid in dormancy.
59 citations
TL;DR: It was concluded that synergistic interaction between AsA and GA3 could alleviate the adverse effects of salinity on P. vulgaris seedlings.
Abstract: Salinity, a severe environmental factor, has limited the growth and productivity of crops. Many compounds have been applied to minimize the harmful effects of salt stress on plant growth. An experiment was conducted to investigate the interactive effects of exogenous ascorbic acid (AsA) and gibberellic acid (GA3) on common bean (Phaseolus vulgaris L. cv. Naz) seedlings under salt stress. The changes of growth parameters, photosynthetic and non-photosynthetic pigments and potassium content showed that the addition of 1 mM AsA and/or 0.05 mM GA3 considerably decreased the oxidative damage in common bean plants treated with 200 mM NaCl. The NaCl-stressed seedlings exposed to AsA or GA3, specifically in their combination, exhibited an improvement in sodium accumulation in both roots and shoots, as compared to NaCl-treated plants. NaCl treatment increased hydrogen peroxide (H2O2) content and lipid peroxidation indicated by accumulation of malondialdehyde (MDA), whereas the interaction of AsA with GA3 decreased the amounts of MDA and H2O2. In the meantime, interactive effect of these substances enhanced protein content and the activity of the antioxidant enzyme, guaiacol peroxidase, in common bean plants under salt stress. It was concluded that synergistic interaction between AsA and GA3 could alleviate the adverse effects of salinity on P. vulgaris seedlings.
59 citations