Variation of Volatiles in Tunisian Populations of Teucrium polium L. (Lamiaceae)

✍ Scribed by Abdennacer Boulila; Afef Béjaoui; Chokri Messaoud; Mohamed Boussaid

• Book ID: 101776159
• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 273 KB
• Volume: 5
• Category: Article
• ISSN: 1612-1872
• DOI: 10.1002/cbdv.200890127

✦ Synopsis

Abstract

Volatiles from wild Tunisian diploid (2__n__=2__x__=26) and tetraploid (2__n__=4__x__=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%), α‐pinene (6.6%), β‐pinene (3; 5.8%), and α‐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 α‐cadinol (38; 50.6%). The dominant compounds in diploid populations, mainly located in the semi arid zone, are α‐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.