title: Variation of Chemical Composition in Flowers and Leaves Essential Oils Among Natural Population of Tunisian Glebionis coronaria (L.) Tzvelev (Asteraceae).
abstract: The aim of this study was to assess the percentage and constituents variations in flowers and leaves essential oil of three Glebionis coronaria (L.) Tzvelev population, growing wildly in three different ecotypes (Utique, M'saken, and Sahara Lektar) in Tunisia. The chemical compositions of these essential oils were analyzed by the GC and GC/MS systems. Qualitative and quantitative differences were recorded between essential oils extracted from plants collected from the three geographical provinces and between organs of the same plant (leaves and flowers). In fact, 161 components representing 87.2 - 96.5% of the whole oils were identified. Myrcene (3.2 - 35.7%), (Z)-β-ocimene (0.6 - 23.0%), camphor (0.6 - 17.2%), cis-chrysanthenol (0 - 6.9%), cis-chrysanthenyl acetate (1.1 - 17.9%), isobornyl acetate (1.6 - 3.5%), (E)-β-farnesene (0 - 6.0%), germacrene D (0 - 8.7%), and (E,E)-α-farnesene (0.7 - 12.4%) were the predominant components in the oils. These major constituents occur in different amounts depending on the organs (leaves or flowers) and the geographical origin of the plant. The chemotaxonomic usefulness of these data was discussed according to results of principal component analysis (PCA). The scores, together with the loadings, revealed a different chemical pattern for each population.
authors.affiliation: Lab.: Appui à la Durabilité des Systèmes de Production Agricole dans la Région du Nord-Ouest, Ecole Supérieure d'Agriculture du Kef, University of Jendouba, 7119, Le Kef, Tunisia. dalila_haouas@yahoo.fr.|UR: 13AGRO4: Développement de la Protection Biologique et Intégrée au Niveau de la Parcelle en Agriculture Biologique, Institut Supérieur Agronomique (ISA), University of Sousse, Chott Mariem, 4042, Tunisia. dalila_haouas@yahoo.fr.
authors.forename: Dalila
authors.initials: D
authors.lastname: Haouas
authors.affiliation: Dipartimento di Farmacia, Università di Pisa, Via Bonanno 33, IT-56126, Pisa, Italy.
authors.forename: Pier Luigi
authors.initials: PL
authors.lastname: Cioni
authors.affiliation: Dipartimento di Farmacia, Università di Pisa, Via Bonanno 33, IT-56126, Pisa, Italy.
authors.forename: Guido
authors.initials: G
authors.lastname: Flamini
authors.affiliation: UR: 13AGRO4: Développement de la Protection Biologique et Intégrée au Niveau de la Parcelle en Agriculture Biologique, Institut Supérieur Agronomique (ISA), University of Sousse, Chott Mariem, 4042, Tunisia.
authors.forename: Monia
authors.initials: M
authors.lastname: Ben Halima-Kamel
authors.affiliation: UR: 13AGRO4: Développement de la Protection Biologique et Intégrée au Niveau de la Parcelle en Agriculture Biologique, Institut Supérieur Agronomique (ISA), University of Sousse, Chott Mariem, 4042, Tunisia.
authors.forename: Mohamed Habib
authors.initials: MH
authors.lastname: Ben Hamouda
mesh_terms: D019659:Asteraceae / Q000737:chemistry*; D035264:Flowers / Q000737:chemistry*; D015394:Molecular Structure; D009822:Oils, Volatile / Q000032:analysis* / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry*; D014416:Tunisia
chemical_list: D009822:Oils, Volatile
keywords: Chemical variation; Ecotypes; Essential oil; Glebionis coronaria; Tunisia