616 Effect of Temperature on Flower Size of Campanula carpatica `Blue Clips' and `Birch Hybrid'

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  • 1 Department of Horticulture, Michigan State University, East Lansing, MI 48824

Flower size generally decreases as temperature increases. The objective of this research was to investigate during development when flowers of Campanula carpatica Jacq. `Blue Clips' and `Birch Hybrid' are sensitive to temperature by conducting two temperature-transfer experiments. In the first experiment, plants were grown initially at 20 °C and then transferred at visible bud to 14, 17, 20, 23, or 26 °C until flower. In the second experiment, plants were transferred from 14 to 26 °C or from 26 to 14 °C at 1, 3, or 5 weeks (`Blue Clips') or at 1, 2, or 3 weeks (`Birch Hybrid') after flower induction. Temperature before visible bud had little effect on final flower size for both species. For example, flower diameter of `Blue Clips' was similar among plants grown at constant 14 °C or grown at 20 °C initially and then transferred at visible bud to 14 or 17 °C. Similarly, flower diameter of plants grown at constant 26 °C was similar to those grown at 20 °C initially and then transferred at visible bud to 26 °C. Flower diameter in these species is correlated with the temperature after VB in the 14 to 26 °C and decreases linearly as the temperature after VB increases.

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