THE EFFECT OF GROWING TEMPERATURE ON KEEPING QUALITY OF CUT ROSES
The water uptake of the cut flowers was favoured by high growing temperature. Flowers grown at 24°C absorbed about twice as much water as flowers grown at 12°C.
Leaves collected from plants at 12, 15, 18 and 24°C were extracted in hot water for 5 minutes. Various amounts of leaf extract were added to the vase water. Leaf extracts from the growing temperature (12°C) resulted in a high number of flowers with bent neck and a short lasting quality of the flowers. The formation of bent neck decreased and number of days to petal wilting increased when leaf extracts from high growing temperature were used. Addition of chlorogenic acid (10-4M) seemed to have a similar effect as low temperature leaf extract. The influence of low temperature leaf extract on bent neck formation and on lasting quality was completely eliminated if a preservative was added.