Variation of volatiles in Tunisian populations of Teucrium polium L. (Lamiaceae).
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.
Boulila
Abdennacer
A
National Institute of Applied Science and Technology, Department of Biology, Laboratory of Plant Biotechnology, Centre Urbain Nord, B.P. 676, 1080 Tunis Cedex, Tunisia.
Béjaoui
Afef
A
Messaoud
Chokri
C
Boussaid
Mohamed
M
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
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