Bioactive gibberellins (GAs) are plant hormones that control growth and development throughout the life cycle of the plant. Isolation and characterization of mutants that are impaired in GA biosynthesis have been crucial in both understanding the role of GAs in regulating plant development and elucidating the GA biosynthetic pathway (Davies, 1995; Hedden and Phillips, 2000). The broad spectrum ...

Presoaking several varieties of seed, especially lettuce, in various 6(substituted) aminoand thiopurine solutions has been found to increase their rate of germination (3, 5, 6). Recently it was also reported that these purine derivatives are synergistic with gibberellin in inducing these biological responses whereas gibberellin alone was only moderately active in stimulating germination of Earl...

Summer annuals overwinter as seeds in the soil seed bank. This is facilitated by a cold-induced increase in dormancy during seed maturation followed by a switch to a state during seed imbibition in which cold instead promotes germination. Here, we show that the seed maturation transcriptome in Arabidopsis thaliana is highly temperature sensitive and reveal that low temperature during seed matur...

Sum,itmary. Barley embryos, completely free from endospernm, wvere excised from germinating grain at various times and al'lowed to diffuse into an aqueous medium for varying lengths of time. At the end of this time, the embrvos and ambient solutioins were separately extracted. Gibberellin-like activity in the extracts was determined with the barley endosperm bioassay using seed from the same va...

Gibberellins are a large family of tetracyclic diterpenoid plant hormones that induce a wide range of plant growth responses including seed germination, stem elongation, leaf expansion, pollen maturation and induction of flowering. Gibberellins were first discovered by a Japanese plant pathologist, Eiichi Kurosawa, from the pathogenic fungus Gibberella fujikuroi in 1926 [1]. Kurosawa was workin...

Abstract The objective of this work was to validate the enzymatic activity in Annona x atemoyaseeds submitted treatments with plant growth regulators belonging group gibberellins and cytokinins for overcoming dormancy during germination process. Initially, water acquisition curve determined, where two points phase II (72 144 hours) were determined evaluate superoxide dismutase (SOD), peroxidase...

The C-repeat binding factor (CBF) is crucial for regulation of cold response in higher plants. In Arabidopsis, the mechanism of CBF3-caused growth retardation is still unclear. Our present work shows that CBF3 shares the similar repression of bioactive gibberellin (GA) as well as upregulation of DELLA proteins with CBF1 and -2. Genetic analysis reveals that DELLAs play an essential role in grow...

Although there have been many observations of transgenes leading to improved plant growth in greenhouse experiments, there is a paucity of data that have been validated by multiple greenhouse experiments or field studies. Genes that encode regulators of gibberellin metabolic pathways were among the first reported to improve biomass growth in trees, and thus were the logical focus of this study....

in order to investigate the characteristics of in vitro microtuberization of potato cv. agria in response to the two triazole anti-gibberellin, paclobutrazole and uniconazol, two independent experiment in five concentrations (0, 0.08, 0.16, 0.32, 0.64 mg/l) of each compound were carried out with four replications for each treatment in a completely randomized design. in this experiment percent o...