The dynamics of the essential oils of Rosa damascena Mill. and Rosa alba L. within a day period has been measured. It has been found that the two genotypes have the same rhythm in the release of volatile emissions. In the context of meteorological conditions the maximum of oil of the pink rose was reached at 8 o’clock (0.275 %), and that of the white rose – at 12 o’clock (0.216%). The quality and quantity changes in oil run parallel. The white rose has the potential to synthesize a high percentage of terpene alcohols – up to 43.97% (compared to 42.48% for the pink rose), but is more unstable in this potential.
A. Dobreva, N. Kovacheva