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Developmental regulation of the gibberellin biosynthetic gene GA1 in Arabidopsis thaliana.

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The GA1 gene of Arabidopsis thaliana encodes ent-kaurene synthase A (KSA), which catalyzes the first committed step in the biosynthetic pathway of the plant hormone gibberellin (GA). Its location in the GA biosynthetic pathway has led to speculation that KSA regulation is one of the controlling

Contribution of gibberellin deactivation by AtGA2ox2 to the suppression of germination of dark-imbibed Arabidopsis thaliana seeds.

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Gibberellin levels in imbibed Arabidopsis thaliana seeds are regulated by light via phytochrome, presumably through regulation of gibberellin biosynthesis genes, AtGA3ox1 and AtGA3ox2, and a deactivation gene, AtGA2ox2. Here, we show that a loss-of-function ga2ox2 mutation causes an increase in

Dual Effect of Light on the Gibberellin- and Nitrate-Stimulated Seed Germination of Sisymbrium officinale and Arabidopsis thaliana.

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Red light (R) has a dual effect on the seed germination of the two related species Arabidopsis thaliana and Sisymbrium officinale. The two species provide different means to separate the light-effects. In S. officinale, stimulation of germination by R depends on the stimultaneous presence of nitrate

Elevated sensitivity to gibberellin by vernalization in the vegetative rosette plants of Eustoma grandiflorum and Arabidopsis thaliana.

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Changes in the sensitivity to gibberellin (GA) after vernalization were studied in the vegetative rosette of Eustoma grandiflorum and late flowering Arabidopsis thaliana mutant, fca-1. The sensitivity to GA after vernalization was monitored using the bolting rate of plants that were grown on a

The sax1 dwarf mutant of Arabidopsis thaliana shows altered sensitivity of growth responses to abscisic acid, auxin, gibberellins and ethylene and is partially rescued by exogenous brassinosteroid.

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Genetic approaches using Arabidopsis thaliana aimed at the identification of mutations affecting events involved in auxin signalling have usually led to the isolation of auxin-resistant mutants. From a selection screen specifically developed to isolate auxin-hypersensitive mutants, one mutant line

[Determination of gibberellins in Arabidopsis thaliana by matrix solid-phase dispersion extraction and high performance liquid chromatography-tandem mass spectrometry].

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A method for the analysis of gibberellin A1 (GA1), gibberellin A3 (GA3) and gibberellin A4 (GA4) in Arabidopsis thaliana by matrix solid-phase dispersion extraction (MSPD) and high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) was developed. The solid sample of Arabidopsis

Highlighting Gibberellins Accumulation Sites in Arabidopsis thaliana Root Using Fluorescently Labeled Gibberellins.

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The physical location of plant hormones is an important factor in maintaining their proper metabolism, perception, and mediated developmental responses. Thus, unveiling plant hormones dynamics at the molecule's level is essential for a comprehensive, detailed understanding of both their functions

Endogenous gibberellin levels influence in-vitro shoot regeneration in Arabidopsis thaliana (L.) Heynh.

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The regeneration of shoot buds from callus cells in vitro is an important technique in modern plant genetic manipulation. Whilst it is clear that genetic factors play a major role in determining the ability of callus cells to become organized into regenerating shoot buds, the precise nature of these

Gibberellins and stem growth in Arabidopsis thaliana. Effects of photoperiod on expression of the GA4 and GA5 loci.

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Arabidopsis thaliana (L.) Heynh. is a quantitative long-day (LD) rosette plant in which stem growth is mediated by gibberellins (CAs). Application of GAs to plants in short-day (SD) conditions resulted in rapid stem elongation and flower formation, with GA4 and GA9 being equally effective, and GA1

Effects of gibberellin mutations on tolerance to apical meristem damage in Arabidopsis thaliana.

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To examine the role of gibberellin hormones (GAs) in tolerance to apical meristem damage (AMD), we characterized the reaction norms of several GA-deficient and insensitive mutants of Arabidopsis thaliana in response to AMD and compared them to those of the wild type, Landsberg, from which they were

Characterisation of a T-DNA-tagged gene of Arabidopsis thaliana that regulates gibberellin metabolism and flowering time

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A gene (At4g20010) involved in regulating flowering time in Arabidopsis thaliana (L.) Heynh. was identified by promoter trap T-DNA tagging. Plants containing a T-DNA insert in the 3'-UTR of At4g20010 flowered later under both long- and short-day conditions compared with control plants. Histochemical

Genetic analyses of the interaction between abscisic acid and gibberellins in the control of leaf development in Arabidopsis thaliana.

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Although abscisic acid (ABA) and gibberellins (GAs) play pivotal roles in many physiological processes in plants, their interaction in the control of leaf growth remains elusive. In this study, genetic analyses of ABA and GA interplay in leaf growth were performed in Arabidopsis thaliana. The

Improved synthetic route of exo-16,17-dihydro-gibberellin A5-13-acetate and the bioactivity of its derivatives towards Arabidopsis thaliana.

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BACKGROUND

The use of exo-16,17-dihydro-gibberellin A5-13-acetate (DHGA₅ ) in agriculture has been limited by its low synthetic yield. This study was aimed at optimizing the synthetic route of DHGA₅ , designing and synthesizing new derivatives with strong

The GA2 locus of Arabidopsis thaliana encodes ent-kaurene synthase of gibberellin biosynthesis.

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The ga2 mutant of Arabidopsis thaliana is a gibberellin-deficient dwarf. Previous biochemical studies have suggested that the ga2 mutant is impaired in the conversion of copalyl diphosphate to ent-kaurene, which is catalyzed by ent-kaurene synthase (KS). Overexpression of the previously isolated KS

Endogenous gibberellins in Arabidopsis thaliana and possible steps blocked in the biosynthetic pathways of the semidwarf ga4 and ga5 mutants.

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Twenty gibberellins (GAs) have been identified in extracts from shoots of the Landsberg erecta line of Arabidopsis thaliana by full-scan gas chromatography-mass spectrometry and Kovats retention indices. Eight of them are members of the early-13-hydroxylation pathway (GA53, GA44, GA19, GA17, GA20,

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Herbal & Natural Medicine

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