Skip to Main content Skip to Navigation
Journal articles

Variations in Allelochemical Composition of Leachates of Different Organs and Maturity Stages of Pinus halepensis

Abstract : We investigated changes in the occurrence of allelochemicals from leachates of different Pinus halepensis organs taking into account the stages of pine stand age (i.e., young <15-years-old, middle age±30-years, and old > 60-years-old). GC-MS analysis of aqueous extracts revealed approx. 59 components from needles and roots. The major constituents were divided into different phyto-chemical groups—phenolics (50%), fatty acids (44%), and terpenoids. Further analyses were carried out to characterize the distribution of allelochemicals in different organs and P. halepensis successional stages. Roots and needles had two distinct chemical profiles, while needle leachates were composed mainly of oxygenated terpenoids (e.g., α-eudesmol, α-cadinol, and α-terpineol). Roots mainly contained fatty acids. Needles from young pine stands had the highest content of monoterpenes, suggesting their role as potential allelochemicals that could help young pine stands to establish. Pooling the different functional chemical groups showed that needles and, to a lesser extent, old roots, had higher chemical diversity than the roots of young and medium-aged pines. The highest diversity in phenolic constituents and fatty acids was in young needles (D chem =2.38). Finally, caffeic acid, a compound that has allelopathic properties was found in aqueous extracts at high concentrations in both young needles and old roots. The role of this compound in mediation of biological interactions in P. halepensis ecosystem functioning is discussed.
Complete list of metadata

Cited literature [34 references]  Display  Hide  Download
Contributor : Anne Bousquet-Mélou Connect in order to contact the contributor
Submitted on : Tuesday, April 10, 2018 - 12:27:20 PM
Last modification on : Friday, August 5, 2022 - 10:33:40 AM


Files produced by the author(s)



Catherine Fernandez, Yogan Monnier, Elena Ormeño, Virginie Baldy, Stephane Greff, et al.. Variations in Allelochemical Composition of Leachates of Different Organs and Maturity Stages of Pinus halepensis. Journal of Chemical Ecology, Springer Verlag, 2009, 35 (8), pp.970-979. ⟨10.1007/s10886-009-9667-8⟩. ⟨hal-00603381v2⟩



Record views


Files downloads