Chemodiversity of Volatile Oils in Thapsia garganica L. (Apiaceae) |
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| Authors: | Imed Hassen Yassine M'Rabet Chaouki Belgacem Ons Kesraoui Hervé Casabianca Karim Hosni |
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| Affiliation: | 1. Laboratoire des Méthodes et Techniques Analytiques, Institut National de Recherche et d'Analyse Physico‐Chimique (INRAP), Biotechpole de Sidi Thabet, 2020, Tunisia;2. Laboratoire des Substances Naturelles, Institut National de Recherche et d'Analyse Physico‐Chimique (INRAP), Biotechpole de Sidi Thabet, 2020, Tunisia, (phone: +216‐71537666;3. fax: +216‐71537888);4. Institut des Sciences Analytiques, Département Service Central d'Analyse, 5 rue de la Doua, FR‐69100 Villeurbanne, Lyon |
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| Abstract: | The chemical composition of the volatile oils obtained from the roots, leaves, flowers, and stems of Thapsia garganica of Tunisian origin was investigated by GC‐FID and GC/MS analyses. Sesquiterpene hydrocarbons and oxygenated monoterpenes were predominant in the oils of all plant parts. Bicyclogermacrene (21.59–35.09%) was the main component in the former compound class, whereas geranial (3.31–14.84%) and linalool (0.81–10.9%) were the most prominent ones in the latter compound class. Principal‐component (PCA) and hierarchical‐cluster (HCA) analyses revealed some common constituents, but also significant variability amongst the oils of the different plant parts. This organ‐specific oil composition was discussed in relation to their biological and ecological functions. For the evaluation of the intraspecific chemical variability in T. garganica, the composition of the flower volatile oils from four wild populations was investigated. Bicyclogermacrene, linalool, and geranial were predominant in the oils of three populations, whereas epicubenol, β‐sesquiphellandrene, and cadina‐1,4‐diene were the most prominent components of the oil of one population. PCA and HCA allowed the separation of the flower oils into three distinct groups, however, no relationship was found between the volatile‐oil composition and the geographical distribution and pedoclimatic conditions of the studied populations. |
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| Keywords: | Thapsia garganica Volatile oils Principal‐component analysis (PCA) Hierarchical‐cluster analysis (HCA) |
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