Abstract
This study was undertaken to clarify the environmental effects after flower-bud initiation on flower-bud growth and development and on cut-flower quality of forced tree paeony (Paeonia suffruticosa Andr. cv. ‘Hanakisoi’).1. Flower-bud development at digging (the first 10 days of September) was advanced if late summer temperatures were low. When plants were treated with temperature, the development of flower buds under LT(27°C, 5, 000lx (day)/21°C (night)) treatment was hastened when compared to that under HT(31°C, 5, 000lx (day)/25°C (night)) or C (field) treatments. Cut-flower quality from plants in the LT treatment was superior to that in the other treatments. Under the C treatment, the highest temperature during summer, flower-bud development was delayed, flowering percent was low and cut-flower quality was poor.2. Although daylength had no influence on flower-bud formation and cut-flower quality, the flowering percent for SD (24°C, short daylength (8 hours, 300lx)) treatment was low compared to the LD(24°C, long daylength (16 hours, 300lx)) treatment.3. The number of days from emergence to flowering under 18°C forcing condition was about 30 for all treatments and the corresponding cumulative degree-day temperatures were within the range of 510°C to 560°C.
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