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 marked decline in transcript abundance of both alpha-amylase gene families in aleurone was associated with a decreased content of bioactive GAs in grains of the semi-dwarf lines.
Abstract: Ectopic expression of a gibberellin 2-oxidase gene (PcGA2ox1) decreased the content of bioactive gibberellins (GAs) in transgenic wheat, producing a range of dwarf plants with different degrees of severity. In at least one case, a single transformation event gave rise to T(1) plants with different degrees of dwarfism, the phenotypes being stably inherited over at least four generations. The dwarf phenotype, which included dark-green leaves, increased tillering and, in severe cases, a prostrate growth habit, was replicated by the application of a GA biosynthesis inhibitor to the wild type. Ear rachis length, grain set, and grain size were also decreased in the wheat transformants, compared with an azygous (null) line. The extent of post-germination alpha-amylase production in grains reflected the severity of the shoot phenotype of the transformants and both developmental processes were restored to normal by the application of gibberellic acid (GA(3)). Expression of two GA biosynthesis genes (TaGA20ox1 and TaGA3ox2) was up-regulated, and that of two alpha-amylase gene families (alpha-Amy1 and alpha-Amy2) down regulated, in scutella of semi-dwarf lines, compared with controls. The marked decline in transcript abundance of both alpha-amylase gene families in aleurone was associated with a decreased content of bioactive GAs in grains of the semi-dwarf lines.
69 citations
TL;DR: Potamogeton nodosus tubers produce floating-type instead of submersed-type leaves when exposed to 10–5 molar synthetic abscisic acid when combined with gibberellic acid, kinetin, or benzyladenine.
Abstract: Potamogeton nodosus tubers produce floating-type instead of submersed-type leaves when exposed to 10 –5 molar synthetic abscisic acid. Abscisic acid-induced leaves have stomata on upper leaf surfaces and higher width/length ratios than controls. These effects are wholly or partially overcome by simultaneous exposure to abscisic acid combined with gibberellic acid, kinetin, or benzyladenine.
69 citations
TL;DR: It is postulated that although ABA is involved in the regulation of tuberization, it is the balance between ‘promoting’ hormones such as ABA and ‘inhibiting’ hormone such as gibberellic acid which is the controlling factor.
Abstract: Potato plants (Solanum tuberosum L.) were grown under constant climatic conditions in water culture with continuous and discontinuous nitrogen supply. The effect of N nutrition on tuberization and abscicic acid (ABA) content in various parts of the plants was investigated. With the exception of the stolons, interrupting the N supply caused an increase in the ABA content. After renewed N supply the ABA content dropped within 3 days to the original level. With continuous N supply the ABA content varied only to a limited extent. The ABA content of the stolons was not affected by the mode of N nutrition and remained at an almost constant level despite the fact that exogenous ABA was translocated within the stolon acropetally and accumulated in the tip. After tuberization the ABA content of the stolons and tubers rose considerably. The increase in ABA content in roots. exudate, and shoot after N withdrawal was accompanied by the initiation of tuberization in ‘physiologically old’ plants but not in “physiologically young’ plants of the same age. It is postulated that although ABA is involved in the regulation of tuberization, it is the balance between ‘promoting’ hormones such as ABA and ‘inhibiting’ hormones such as gibberellic acid which is the controlling factor.
69 citations
TL;DR: Because of relative ease of operation, great sensitivity and the short time required for assessing biological activity, this assay could be used in conjunction with the bean second internode bioassay for evaluating the activity of brassinolide and its analogs, as well as of other growth promoters.
Abstract: The growth rate of mung bean epicotyls was used for evaluating the effect of brassinolide on cell elongation. Growth above that of control plants was observed at 10−10M and above. Gibberellic acid showed an additivity relationship with low concentrations (10−9–10−8M) of brassinolide in this test system and the two growth promoters may therefore act independently at the cellular level. Because of relative ease of operation, great sensitivity and the short time required for assessing biological activity, this assay could be used in conjunction with the bean second internode bioassay for evaluating the activity of brassinolide and its analogs, as well as of other growth promotors.
69 citations
TL;DR: From the assessment of the enzyme activity in a number of commercial malts it would appear that the germination time used for some malts is too short to take full advantage of the critical phase of very rapid enzyme development.
Abstract: The development of endo β-glucanase during the micro-malting of barley, with and without the addition of gibberellic acid, was compared. Results indicated that the stimulative effect of gibberellic acid on the enzyme system was of only marginal practical importance.
From the assessment of the enzyme activity in a number of commercial malts it would appear that the germination time used for some malts is too short to take full advantage of the critical phase of very rapid enzyme development.
The viscosity-reducing power of β-glucanase was demonstrated in miniature brewery mashing experiments and details of the progressive degradation of β-glucan by the enzyme system were analysed by gel filtration methods.
The β-glucan content of a number of varieties of barley was established.
68 citations