Document Detail

Qualitative and quantitative variation in monoterpene co-occurrence and composition in the essential oil of Thymus vulgaris chemotypes.
MedLine Citation:
PMID:  12775148     Owner:  NLM     Status:  MEDLINE    
Thymus vulgaris has a chemical polymorphism with six different chemotypes that show marked spatial segregation in nature. Although some populations have a single chemotype in majority, many have two or three chemotypes. In this study we analyze the quantitative variation among T. vulgaris populations in the percentage of oil composed of the dominant monoterpene(s) for each chemotype. In general, phenolic chemotypes (thymol and carvacrol), which occur at the end of the biosynthetic chain, have a significantly lower proportion of their oil composed of their dominant monoterpene than nonphenolic chemotypes (geraniol, alpha-terpineol, and linalool). This is due to the presence of high amounts of precursors (gamma-terpinene and paracymene) in the oil of phenolic chemotypes. The essential oil of the nonphenolic thuyanol chemotype has four characteristic monoterpenes that together make up a lower proportion of the oil than the single dominant monoterpene of the other nonphenolic chemotypes. For all chemotypes, the percentage composition of the dominant monoterpene decreased significantly at sites where the chemotype is not the majority type. This decrease is correlated with a significant increase in either the proportion of the two precursors for the thymol chemotype or the monoterpenes characteristic of the other chemotypes at the site. The latter result suggests that a plant with dominant genes is responsible for the production of different monoterpenes can produce several molecules.
John D Thompson; Jean-Claude Chalchat; André Michet; Yan B Linhart; Bodil Ehlers
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of chemical ecology     Volume:  29     ISSN:  0098-0331     ISO Abbreviation:  J. Chem. Ecol.     Publication Date:  2003 Apr 
Date Detail:
Created Date:  2003-05-30     Completed Date:  2003-09-04     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7505563     Medline TA:  J Chem Ecol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  859-80     Citation Subset:  IM    
Centre d'Ecologie Fonctionnelle et Evolutive, CNRS, 1919 Route de Mende, 34293 Montpellier Cedex 5, France.
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MeSH Terms
Adaptation, Physiological
Monoterpenes / analysis*,  chemistry*
Oils, Volatile / analysis
Polymorphism, Genetic
Thymus Plant / chemistry*,  genetics
Reg. No./Substance:
0/Monoterpenes; 0/Oils, Volatile

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