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: Pre-sowing seed soaking treatments with kinetin, gibberellic acid and to a lesser extent indole-3-acetic acid alleviated salt stress effects as apparent from seedling dry mass and evolved more ethylene both under saline and non-saline conditions.
Abstract: Seedlings of the salt sensitive wheat cultivar C-306 evolved more ethylene than the salt tolerant cultivar Kharchia-65 under different levels of both chloride- and sulphate-dominated types of salinity. Pre-sowing seed soaking treatments with kinetin, gibberellic acid and to a lesser extent indole-3-acetic acid alleviated salt stress effects as apparent from seedling dry mass. Treated seedlings also evolved more ethylene both under saline and non-saline conditions. Ethrel did not affect seedling growth as well as ethylene production. Abscisic acid inhibited seedling growth and ethylene production under both types of salinity.
53 citations
TL;DR: Evidence is presented consistent with the idea that two enzymes in the second group are also synthesized de novo, and this system has been used to study hormonal control of enzyme secretion.
Abstract: When isolated aleurone layers of barley are incubated they produce a number of hydrolytic enzymes which can be divided into three groups. The synthesis and the secretion of the hydrolases in the first group is greatly enhanced by gibberellic acid. Using the density labeling technique of Filner and Varner (3) it has been shown that the increase in enzymatic activity of two of the enzymes in this group (a-amylase and protease) is due to de novo synthesis (3, 6). The marked effect of gibberellic acid on the rate of enzyme synthesis makes this an ideal system to study hormonal control of protein synthesis (10). The total enzymatic activity of hydrolases in the second group (e.g., ribonuclease and B-glucanase) does not show the same response to GA. There is a considerable increase in enzymatic activity during imbibition of the seeds, but the addition of GA to the isolated aleurone layers causes only a small increase in the total amount of enzyme activity (2, 7). However, release of these enzymes in the medium is dependent on GA, and this system has been used to study hormonal control of enzyme secretion (2, 7). Whether or not the increase in enzymatic activity which occurs during imbibition of the halfseeds and incubation of the aleurone layers is due to de novo synthesis has never been determined. Finally, the enzymatic activity of at least one hydrolase, /3-amylase, increases in the presence of GA, but this is due to release of preformed enzyme and not to de novo synthesis (5). We now present evidence consistent with the idea that two enzymes in the second group are also synthesized de novo.
53 citations
TL;DR: It is shown that Azotobacter cultures can affect the germination of seeds and growth of plants, and the detection of another growth-active compound, in addition to indole-3-acetic acid, was described.
Abstract: IT is known that Azotobacter cultures can affect the germination of seeds and growth of plants. It is assumed that this influence is due to the presence of physiologically active substances and vitamins in the cultures. Actually, indole-3-acetic acid has been detected in Azotobacter cultures1,2. In a previous paper2 the detection of another growth-active compound, in addition to indole-3-acetic acid, was described. More details about this compound, which appeared to be gibberellic acid, are presented here.
53 citations
TL;DR: It is concluded that the concept of causality in the relationship between growth retardation and gibberellin biosynthesis is probably premature, since growth retardants have a more general inhibitory action on isoprenoid biosynthesis in plants.
Abstract: Three plant-growth retardants 2′-isopropy1-4′-(trimethylammonium chloride)-5-methylphenylpiperidine carboxylate (Amo 1618), β-chloroethyltrimethylammonium chloride, and tributyl-2, 4-dichlorobenzylphosphonium chloride were tested for their effects on sterol production in, and growth of tobacco (Nicotiana tabacum) seedlings. As the concentration of each retardant increased, there was an increased inhibition of the incorporation of dl-2-14C-mevalonic acid into sterol (particularly desmethylsterol) fractions and an increased retardation of stem growth. Growth retardation was observed with both single and repeated retardant treatments, and with Amo 1618, in particular, a close quantitative relationship between inhibition of sterol biosynthesis and stem growth was obtained. Gibberellic acid completely overcame retardant effects and application of sterols also restored normal growth. It is concluded that the concept of causality in the relationship between growth retardation and gibberellin biosynthesis is probably premature, since growth retardants have a more general inhibitory action on isoprenoid biosynthesis in plants.
53 citations
TL;DR: The poly(A)-containing mRNA from barley aleurone layers pretreated with gibberellic acid has been purified by phenol-chloroform extraction and repeated oligo[d(pT)]-cellulose chromatography and its molecular weight has been determined to be 580,000.
Abstract: The poly(A)-containing mRNA from barley aleurone layers pretreated with gibberellic acid has been purified by phenol-chloroform extraction and repeated oligo[d(pT)]-cellulose chromatography. This RNA has been translated in both the wheat germ and reticulocyte lysate in vitro translation systems with greater than 50% of the synthesized protein being α-amylase. The mRNA for α-amylase has been further purified by dimethylsulfoxide-formamide-sucrose density gradient centrifugation and by gel electrophoresis. By these methods, its molecular weight has been determined to be 580,000.
53 citations