ISHS Acta Horticulturae 673: IX International Symposium on Flower Bulbs
LILIUM LONGIFLORUM THUNB., A CLASSIC MODEL TO STUDY TEMPERATURE AND PHOTOPERIOD INTERACTIONS ON DORMANCY, FLOWER INDUCTION, LEAF UNFOLDING AND FLOWER DEVELOPMENT |
| Author: | H.F. Wilkins |
| Keywords: | temperature, photoperiod, flowering, dormancy |
| Abstract:
Bulbs for commercial production require a ±2,000 hr of 5°C for most rapid flowering with ±80 leaves. However, at 21°C, freshly harvested bulbs will slowly emerge, shoots will elongate under long days and eventually form an apical “pseudo bulbs”. When these plants are shifted to 18°C, anthesis occurs in 60 days. Plants will have 200+ leaves. Thus, “vernalization” occurs at temperatures below 20°C. There is also a “casual” substitution for cold by long day, at 16°C for rapid flowering. Both leaf unfolding and flower elongation rates can be controlled by temperature. Both growth responses are most rapid at 21°C. It is interesting to note that in the native Japanese habitat sites of Okinawa, Amami and Erabu Islands the average temperature is 21°C. | |
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