ISHS Acta Horticulturae 547: III International Symposium on Rose Research and Cultivation
EFFECTS OF TEMPERATURE ON LEAF AREA AND FLOWER SIZE IN ROSE |
| Authors: | H.K. Shin, J.H. Lieth, S.H. Kim |
| Abstract:
The response of ‘Kardinal’ rose plants to temperature was measured to develop a model for predicting rose flower size for a range of greenhouse conditions. The number of days from bud break (BB) to flowering increased from 21.6 to 63.0 days as temperature decreased from 30 to 15°C. The number of days to flower was primarily influenced by the temperature after the visible bud (VB). This suggests that the temperature before VB may not significantly affect the rate of flower development. Leaf area, stem length and stem diameter generally increased with decreasing temperature, but the best quality of stems was observed at 18°C. Flower dry weight, however, increased from 0.7 to 3.0 g as temperature decreased from 30 to 15°C. When plants were moved to lower temperature at VB stage, flower dry weight increased. Temperature has it’s most pronounce influence on flower development during the period between VB and flowering so that during commercial greenhouse rose production any reduction in temperature during that period can result in increasing the size of rose flower buds. | |
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