ISHS Acta Horticulturae 541: IV International Symposium on New Floricultural Crops
PSEUDOBULB INJECTED GROWTH REGULATORS AS AIDS FOR YEAR AROUND PRODUCTION OF HAWAIIAN DENDROBIUM ORCHID CUTFLOWERS |
| Authors: | W.S. Sakai, C. Adams, G. Braun |
| Keywords: | Dendrobium Jaquelyn Thomas, benzyladenine, gibberellic acid,inflorescence, development |
| Abstract:
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. | |
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