We investigated floral initiation in the long-day monocot Lolium temulentum, strain Ceres, by culturing apices explanted from photoperiodically induced plants at various times after one inductive long day onto medium with, and without, gibberellin. Apices cultured on the first day after the inductive long day usually required gibberellin in the medium to initiate floral morphogenesis while apic...

Cultures of Azotobacter chroococcum strain A6 were grown for 14 days in a nitrogen-deficient mineral medium, the supernatant fluid and bacteria extracted and examined by paper partition chromatography with two solvent systems which separate authentic gibberellin (GA 3) and indolyl-3-acetic acid (IAA). Gibberellin-like substances were not detected on the chromatograms examined under ultraviolet ...

this research evaluated the effects of gibberellin (ga3) and abscisic acid (aba) on emergence capability, rate of emergence, vigor index and some physiological characters of chickpea seedling (cicer arietinum l.) in a field experiment (as split) under dry and irrigated conditions. seeds were primed with 0, 50, 100 and 150 ppm of each phytohormones. examined chickpea cultivar was azad. the resul...

Leaf trichomes protect plants from attack by insect herbivores and are often induced following damage. Hormonal regulation of this plant induction response has not been previously studied. In a series of experiments, we addressed the effects of artificial damage, jasmonic acid, salicylic acid, and gibberellin on induction of trichomes in Arabidopsis. Artificial damage and jasmonic acid caused s...

Flowering of Nicotiana tabacum cv Xhanti depends on gibberellins because gibberellin-deficient plants, due to overexpression of a gibberellin 2-oxidase gene (35S:NoGA2ox3) or to treatment with the gibberellin biosynthesis inhibitor paclobutrazol, flowered later than wild type. These plants also showed inhibition of the expression of molecular markers related to floral transition (NtMADS-4 and N...

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...

4. BRIAN, P. W., H. C. HEMMING, AND D. LOWE. 1962. Relative activity of the gibberellins. Nature, 193: 946-8. 5. BROWN, C. AND E. M. GIFFORD, JR. 1958. The relation of the cotyledons to root development of pine embryos grown in vitro. Plant Physiol. 33: 57-64. 6. BUKOVAC, M. J. AND S. H. WITTWER, 1961. Biological evaluation of gibberellins A1, A2, A3 and A4 and some of their derivatives. In: Pl...

Pollen tube growth is inhibited and promoted by long- short-chain carboxylic acids, respectively, but not affected formic acid. For auxin- gibberellin-induced elongation of in vitro cultured epicotyl segments adzuki bean (Vigna angularis), a series acids showed similar effects as that on pollen except acid the strongest promotive effect. The GA3 IAA-induced were additive both strongly inhibitor...