title: Variation of volatiles in Tunisian populations of Teucrium polium L. (Lamiaceae).
abstract: Volatiles from wild Tunisian diploid (2n=2x=26) and tetraploid (2n=4x=52) Teucrium polium L. populations from five bioclimatic zones were assessed by GC and GC/MS. Thirty-eight compounds were identified. Main volatiles at the species level were myrcene (6; 15.3%), germacrene D (27; 9.0%), alpha-pinene (6.6%), beta-pinene (3; 5.8%), and alpha-cadinol (38; 5.1%). A significant variation among populations was observed. The tetraploid populations belonging to the sub humid and lower semi arid bioclimates showed a high amount of myrcene (6; 24.2-43.8%), those from the upper arid contain high percentages of alpha-cadinol (38; 50.6%). The dominant compounds in diploid populations, mainly located in the semi arid zone, are alpha-pinene (1) and germacrene D (27). Population chemical structure, assessed by a principal component analysis (PCA) using all identified compounds, is concordant with bioclimate and ploidy level. In situ conservation of populations should be made appropriately according to these two factors.
authors.affiliation: National Institute of Applied Science and Technology, Department of Biology, Laboratory of Plant Biotechnology, Centre Urbain Nord, B.P. 676, 1080 Tunis Cedex, Tunisia.
authors.forename: Abdennacer
authors.initials: A
authors.lastname: Boulila
authors.forename: Afef
authors.initials: A
authors.lastname: Béjaoui
authors.forename: Chokri
authors.initials: C
authors.lastname: Messaoud
authors.forename: Mohamed
authors.initials: M
authors.lastname: Boussaid
mesh_terms: D000080462:Acyclic Monoterpenes; D000475:Alkenes / Q000302:isolation & purification; D000081008:Bicyclic Monoterpenes; D001643:Bridged Bicyclo Compounds / Q000302:isolation & purification; D039821:Monoterpenes / Q000302:isolation & purification; D009822:Oils, Volatile / Q000302:isolation & purification*; D025341:Principal Component Analysis; D045788:Sesquiterpenes, Germacrane / Q000302:isolation & purification; D013729:Terpenes / Q000302:isolation & purification; D031367:Teucrium / Q000737:chemistry* / Q000235:genetics; D014416:Tunisia
chemical_list: D000080462:Acyclic Monoterpenes; D000475:Alkenes; D000081008:Bicyclic Monoterpenes; D001643:Bridged Bicyclo Compounds; D039821:Monoterpenes; D009822:Oils, Volatile; D045788:Sesquiterpenes, Germacrane; D013729:Terpenes; C445364:cadinol; C509595:myrcene; C010789:beta-pinene; C005451:alpha-pinene; C027259:germacrene D