The effects of foliar application of some micronutrient elements on the content and composition of the essential oil of Damask rose (Rosa damascena Mill.)

The present study was conducted to investigate the effects of micronutrient elements (Fe, Cu, Zn and Mn) application on the content and composition of essential oil of Damask rose (Rosa damascena Mill.) flowers in southwestern Iran (Shahrekord) in ۲۰۱۹ and ۲۰۲۰. Four foliar fertilizers including Librel Fe-Lo, Librel Cu, Librel Zn and Librel Mn were applied as mineral fertilizers. Librel Fe-Lo contains ۱۳.۲% chelated iron, Librel Zn is a foliar fertilizer with ۱۴% Zinc in chelated form, Librel Cu has ۱۴% copper in chelated form, and Librel Mn is comprised of ۱۳% Mn chelated with EDTA. Results obtained from gas chromatography/mass spectrometry (GC-MS) showed ۳۶ essential oil components. The highest (۰.۱۱-۰.۱۴%) and lowest (۰.۰۳-۰.۰۵%) levels of essential oil content were obtained from combined Fe, Cu, Zn and Mn treatment and control treatment, respectively. Plants treated by the combinations of ۴۰ ppm of micronutrients (Fe۳Cu۳Zn۳Mn۳ treatment) and control produced the greatest and lowest amounts in most essential oil components, respectively. The predominant components of the essential oil included oxygenated monoterpenes including beta-citronellol (۲۲.۵-۲۸.۱%), geraniol (۱۵.۱-۲۳.۱%), camphor (۰.۸۶-۲.۳%), citronellol (۰.۴-۱.۹%), trans-geraniol (۰.۵-۲.۱%), together with aliphatic hydrocarbons  including nonadecane (۱۱.۱-۱۳.۳%), pentadecane (۳.۵۵-۸.۹%), and heneicosane (۴.۵-۸.۷%). Application higher than ۴۰ ppm of micronutrients, most possibly due to toxicity, lowered both content and composition of essential oil.

کلیدواژه ها:

Beta-citronellol ، Geraniol ، Microelements ، Monadecane ، Rosa damascena Mill