ISHS Acta Horticulturae 766: XXVII International Horticultural Congress - IHC2006: International Symposium on Ornamentals, Now!
TEMPERATURE SENSITIVITY FOR SHOOTING OF BULBLETS IN LILIUM FORMOLONGI |
| Authors: | Dae-Hoe Goo, Kiu-Weon Kim |
| Keywords: | L. formolongi, growth temperature, duration, flowering, endogenous hormone, cytokinin, trans-zeatin riboside, auxin, indoleacetic acid |
| Abstract:
Lilium formolongi 'F1 August' plantlets with scale-leaves and scale-bulb were treated at 10, 15, 20, 25°C for 15, 30, or 45 days and planted in February, March, April and May. In the April planting, flowering percentage was below 10% and in the May planting no flowering occurred. Sprouting and flowering percentages were lower at the late planting times. Days to flowering of the April planting was 110.8 days compared to 128 days for the February planting. Plant height and numbers of leaves were reduced to 7.2 in May planting, compared to 40.5 leaves in February planting, and no flowers emerged in either the April or May plantings. Plantlets exposed to 10 or 15°C flowered at 80 percent or higher at all treatment durations, but at 20 or 25°C flowering percentages were lower, with 30% or less in the 25°C treatment. In the 15°C treatment days to flowering were less than 100 days, while the number of flowers and flower bud differentiation were greatest in the 15°C treatment. Cytokinin and auxin were analysed in bulblets grown at 15, 20 and 25°C. T-zeatin content was three times greater in the 15°C treatment than at 25°C, but the content of indoleacetic acid (IAA) was less at 15°C than at 20 and 25°C. In the 15°C treatment, t-zeatin content was about twice the IAA content in the scale- bulblet. The auxin and cytokinin balance may affect flower bud differentiation. | |
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