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Gibberellic acid, some info
Sounds like most artificial treatments...some advantages and disadvantages.
-- Reka I don't give a damn for a man that can only spell a word one way. Mark Twain (1835 - 1910) http://www.rolbox.it/hukari/index.html Gibberellic acid and cytokinin (separate or combined) are not effective in triggering the onset of the flowering process in Phalaenopsis at high and non-inductive temperatures. http://primera.tamu.edu/orchids/symposium2000.htm The effect of injection of high concentrations of 6-benzyladenine (BA) into pseudobulbs (stems) of Dendrobium Jaquelyn Thomas ' Uniwai Princess' was evaluated. The flowering cycle for mature plants of Dendrobium Jaquelyn Thomas is production of one new pseudobulb per year with fall and early winter flowering on leaved pseudobulbs in their first year (1-yr) of growth and summer and fall flowering on almost leafless pseudobulbs in their second year (2-yr) and subsequent years. Pseudobulb injections made in November caused the growth of dormant lateral buds into inflorescences (sprays) that flowered in February in the spring off-season. Injection of 100 mM BA into 1-yr stems resulted in a significant increase in flower spray production over control non-treated stems, 8.92 vs. 0.52, respectively. Injection of 100 mM and 10 mM BA solutions into 2-yr stems also resulted in a significant increase in flower spray production over controls, 6.32 and 4.00, vs. 0.24, respectively. The high concentrations of BA also significantly reduced inflorescence length and caused development of abnormally formed flowers. Addition of gibberellic acid (GA) to the injection solution significantly increased inflorescence length and reduced the percentage of abnormally formed flowers. Timing of injection for year around production of Hawaiian dendrobium cut flower sprays is discussed. http://www.actahort.org/books/541/541_30.htm Functions of Gibberellins Active gibberellins show many physiological effects, each depending on the type of gibberellin present as well as the species of plant. Some of the physiological processes stimulated by gibberellins are outlined below (Davies, 1995; Mauseth, 1991; Raven, 1992; Salisbury and Ross, 1992). Stimulate stem elongation by stimulating cell division and elongation. Stimulates bolting/flowering in response to long days. Breaks seed dormancy in some plants which require stratification or light to induce germination. Stimulates enzyme production (a-amylase) in germinating cereal grains for mobilization of seed reserves. Induces maleness in dioecious flowers (sex expression). Can cause parthenocarpic (seedless) fruit development. Can delay senescence in leaves and citrus fruits. http://www.plant-hormones.info/gibberellins.htm For stimulating side-shoots in Nepenthes spp., orchids, etc. a small amount of GA3 can be rubbed into a nick on the stem, or may be applied mixed with lanolin to provide a weatherproof seal around the cut. Exact dosage is not critical, as the GA3 will degrade over the course of a few weeks. http://www.flytrap.demon.co.uk/cc/data/ga3.htm Chen, J. T. and W. C. Chang. 2003a. Effects of GA3, ancymidol, cycocel and paclobutrazol on direct somatic embryogenesis of Oncidium in vitro. Plant Cell Tiss. Org. Cult. 72:105-108. http://botany.sinica.edu.tw/english/...nel/120-n.html "profpam" schrieb im Newsbeitrag ... The Press Enterprise article (2/28/04) -- Plant Food Makes Massive Impression -- cites a new product --MegaGro, containing Gibberellic acid. Has anyone used this product on orchids? . . . Pam Everything Orchid Management System http://www.pe.net/~profpam/page3.html --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.583 / Virus Database: 369 - Release Date: 10.02.04 |
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