Comparison in essential oil of Rosa damascena Mill. during harvest period under calcareous soil conditions

Rosa damascena Mill. is the most important scented rose species which cultivated for essential oil production in the world. The objective of the present study was to understand how different harvest dates influenced the essential oil yields and chemical compounds in petals of Rosa damascena Mill. planted for the first time under calcareous soil conditions, Sa′adat Shahr region. In the current survey, flowers were collected four times with three replications from four years old plants between ۰۵:۰۰ and ۰۶:۰۰ AM (۲nd, ۹th, ۱۶th and ۲۳rd of May, ۲۰۲۰). The essential oils of samples were extracted by hydro-distillation system (Clevenger apparatus) and were analyzed by a combination of GC-FID and GC-MS techniques, to check for chemical variability. The essential oil content of flowers harvested at different times ranged from ۰.۰۴۶% to ۰.۰۸۲% (w/w). The number of identified compounds were ۳۰, of which ۲۱ were common. The highest content of citronellol + geraniol (۶۰.۹ %), which are the most important constituents of its essential oil, was observed when the flowers were harvested in the ۲nd of May. However, the lowest content of them (۴۰.۶ %) was found in the flowers of the fourth week of harvesting. n-nonadecane and n-heneicosane continuously increased from the first week (۱۷.۴ %) to the fourth week (۳۴.۸ %) of the harvest. This experiment revealed that different harvest dates can significantly modify the performance and composition of Damask rose’ essential oil. Moreover, calcareous soil conditions could be used to obtain essential oil of Rosa damascena Mill.

کلیدواژه ها:

Chemical variation ، Citronellol ، Essential oil ، Geraniol ، Harvest period ، Chemical variation ، Citronellol ، Essential oil ، Geraniol ، Harvest period