Changes in Essential Oil Content and Composition of Clary Sage (Salvia sclarea) Aerial Parts during Different Phenological Stages

摘要

The variations in quantity and quality of essential oils (EOs) of Salvia sclarea L. (Lamiaceae) were examined at different phenological stages (i.e. rosette, stem initiation, full flowering, and fruit set) of the life cycle of species. The EOs of air-dried samples were obtained by hydrodistillation. The yields of EOs (w/w %) were 0.23, 0.15, 1.36, and 1.35% at rosette, stem initiation, full flowering, and fruit set stages, respectively. The EOs were analyzed by GC and GC-MS. A total of 17, 27, 19, and 51 components were identified and quantified at the above mentioned stages, respectively. The proportions of linalool and linalyl acetate, as major oil constituents were highest at the full flowering stage. However, the main group of compounds at the rosette stage was the monoterpene esters (53.36%) and at stem initiation the sesquiterpenes (57.7%). Moreover, monoterpene alcohols were the predominant compounds at full flowering (43.7%>) and at fruit set (34.88%.) stages.