seasonal variation in floral scent of persian musk rose (rosa moschata hermm.)

the seasonal variation of volatile oil compositions (vocs) from fresh flowers of persian musk rose was investigated by combi pal headspace techniques. in this study, a total number of 21 vocs were detected by headspace on the combi pal system and gas chromatography-mass spectrometry (hs-gc/ms) from rosa moschata herrm. at different seasons which was representing 92.53-99.37% of total vocs. the analysis of vocs at different seasons detected the major compounds: phenyl ethyl alcohol (30.68-77.36%), 1-nonadecene (1.01-30.42%), n-nonadecane (4.61-14.04%), n-heneicosane (4.47-12.07%) and 1-tricosene (0-5.91%). phenylpropanoids content varied significantly over time, with a low level during september and maximum content in may. in contrast to phenylpropanoids contents, the high level of fatty acid derivatives was realized during september. in all of seasons a low level of terpenoids derivatives was emitted from persian musk rose flowers. the results of this research suggest that the fragrance characteristics of r. moschata resulted from its specific composition and can be manipulated by seasonal changes and environmental conditions.