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Variation of Volatiles in Tunisian Populations of Teucrium polium L. (Lamiaceae)
Author(s) -
Boulila Abdennacer,
Béjaoui Afef,
Messaoud Chokri,
Boussaid Mohamed
Publication year - 2008
Publication title -
chemistry and biodiversity
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.427
H-Index - 70
eISSN - 1612-1880
pISSN - 1612-1872
DOI - 10.1002/cbdv.200890127
Subject(s) - ploidy , teucrium , arid , lamiaceae , population , myrcene , botany , germacrene , chemistry , biology , ecology , sesquiterpene , essential oil , limonene , genetics , demography , sociology , gene
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.