BACKGROUND: Drought stress is one of the most critical factors in the reduction of yield among plant growth factors. Salicylic acid is a regulator that plays a vital role in the physiological processes of the plant. Gibberellin is one of the plant growth-regulating hormones that have different effects on the growth and development of many plants during growth stages. <str...

Gibberellins are a class of terpenoid molecules that can act as plant growth regulators. This class was discovered through the investigation of sick rice plants that were infested by the fungus Gibberella fujikuroi. In 1926, Eiichi Kurosawa determined that a substance, dubbed gibberellic acid, secreted by the fungus was causing the disease. Subsequently, it was realized that gibberellic acid is...

BACKGROUND AND AIMS Gibberellin stimulates negative gravitropism and the formation of tension wood in tilted Acacia mangium seedlings, while inhibitors of gibberellin synthesis strongly inhibit the return to vertical growth and suppress the formation of tension wood. To characterize the role of gibberellin in tension wood formation and gravitropism, this study investigated the role of gibberell...

Gibberellic acid, a tetracyclic dihydroxylactonic acid, C1H2206, produces marked shoot elongation in many plants (2, 3, 11, 12, 13). Unlike other auxins, its stimulation of growth of intact plants often results in substantial increases in height, and in fresh and dry weights (2). Brian (2) noted that the ash, nitrogen, phosphorus, potassium, total soluble carbohydrates, and carbon increased in ...

Treatment of plant tissues with gibberellic acid leads to increased levels of auxin and stem elongation in several plant species (7,13). Pretreatment of plant tisstues with ethylene is known to decrease levels of diffusible auxin (5, 10, 20) as well as cell elongation (3, 4). Recent evidence has indicated that a significant influence of gibberellin on auxin levels and growth processes is ithrou...

The Arabidopsis GA3 cDNA was expressed in yeast (Saccharomyces cerevisiae) and the ability of the transformed yeast cells to metabolize ent-kaurene was tested. We show by full-scan gas chromatography-mass spectrometry that the transformed cells produce ent-kaurenoic acid, and demonstrate that the single enzyme GA3 (ent-kaurene oxidase) catalyzes the three steps of gibberellin biosynthesis from ...

(ibl)berellinl-like stulstances occtlr in mianv higher pllants (1 2, 17, 20). and sexeral have beenl idenitified (12). Tlhe presence of gibberelliln-like activity in seedless fruit, of V'itis v'iiifcra L. was (lenlonstrated in 1960 by Coombe (1). Although it seemiis probable that sulch a widely spread hormonie also would be invxolved in the groxwth of seede(d fruit, Coombe was unable to demnons...

Gibberellin regulates plant growth, development, and metabolic processes. However, the underlying mechanism of substantial effect gibberellin on stem height secondary metabolites in forage ramie is unclear. Therefore, this study combined transcriptomic metabolomics analyses to identify mechanisms regulating growth metabolite contents following exogenous application. Exogenous application signif...

■ Abstract Gibberellins are hormones that control growth and a wide variety of other plant developmental processes. In recent years, significant progress has been made on the biochemistry of gibberellin biosynthesis and on the mechanisms by which gibberellin levels are regulated in plants. There have also been major advances in the understanding of gibberellin signaling, with several key genes ...

Arabidopsis has three gibberellin receptors, GIBBERELLIN INSENSITIVE DWARF1 A (GID1A), GID1B and GID1C. All GID1s are localized to the nucleus but have also been detected in the cytoplasm. Since other major gibberellin signaling components have been localized to the nucleus, the current model suggests that gibberellin perception and signaling is nuclear. In this work we investigated whether GID...