title: Chemodiversity of volatile oils in Thapsia garganica L. (Apiaceae).
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.
authors: Laboratoire des Méthodes et Techniques Analytiques, Institut National de Recherche et d'Analyse Physico-Chimique (INRAP), Biotechpole de Sidi Thabet, 2020, Tunisia.
authors: Imed
authors: I
authors: Hassen
authors: Yassine
authors: Y
authors: M'Rabet
authors: Chaouki
authors: C
authors: Belgacem
authors: Ons
authors: O
authors: Kesraoui
authors: Hervé
authors: H
authors: Casabianca
authors: Karim
authors: K
authors: Hosni
mesh_terms: D000080462:Acyclic Monoterpenes; D044822:Biodiversity; D016000:Cluster Analysis; D035264:Flowers / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry; D039821:Monoterpenes / Q000032:analysis; D009281:Naphthalenes / Q000032:analysis; D009822:Oils, Volatile / Q000032:analysis / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry; D010938:Plant Oils / Q000737:chemistry; D018517:Plant Roots / Q000737:chemistry; D018547:Plant Stems / Q000737:chemistry; D025341:Principal Component Analysis; D012717:Sesquiterpenes / Q000032:analysis; D045788:Sesquiterpenes, Germacrane / Q000032:analysis; D053629:Thapsia / Q000737:chemistry*; D014416:Tunisia
chemical_list: D000080462:Acyclic Monoterpenes; D039821:Monoterpenes; D009281:Naphthalenes; D009822:Oils, Volatile; D010938:Plant Oils; D012717:Sesquiterpenes; D045788:Sesquiterpenes, Germacrane; C506317:epicubenol; C018584:linalool; C007076:citral
keywords: Hierarchical-cluster analysis (HCA); Principal-component analysis (PCA); Thapsia garganica; Volatile oils