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, 34 (9), 1219-29

Production and Diversity of Volatile Terpenes From Plants on Calcareous and Siliceous Soils: Effect of Soil Nutrients

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Production and Diversity of Volatile Terpenes From Plants on Calcareous and Siliceous Soils: Effect of Soil Nutrients

Elena Ormeño et al. J Chem Ecol.

Abstract

Fertilizer effects on terpene production have been noted in numerous reports. In contrast, only a few studies have studied the response of leaf terpene content to naturally different soil fertility levels. Terpene content, as determined by gas chromatography/mass spectrometry/flame ionization detector, and growth of Pinus halepensis, Rosmarinus officinalis, and Cistus albidus were studied on calcareous and siliceous soils under field conditions. The effect of nitrogen (N) and extractable phosphorus (P(E)) from these soils on terpenes was also investigated since calcareous soils mainly differ from siliceous soils in their higher nutrient loadings. Rich terpene mixtures were detected. Twenty-one terpenes appeared in leaf extracts of R. officinalis and C. albidus and 20 in P. halepensis. Growth of all species was enhanced on calcareous soils, while terpene content showed a species-specific response to soil type. The total monoterpene content of P. halepensis and that of some major compounds (e.g., delta-terpinene) were higher on calcareous than on siliceous soils. A significant and positive relationship was found between concentration of N and P(E) and leaf terpene content of this species. These findings suggest that P. halepensis may respond to an environment characterized by increasing soil deposition, by allocating carbon resources to the synthesis of terpene defense metabolites without growth reduction. Results obtained for R. officinalis showed high concentrations of numerous major monoterpenes (e.g., myrcene, camphor) in plants growing on calcareous soils, while alpha-pinene, beta-caryophyllene, and the total sesquiterpene content were higher on siliceous soils. Finally, only alloaromadendrene and delta-cadinene of C. albidus showed higher concentrations on siliceous soils. Unlike P. halepensis, soil nutrients were not involved in terpene variation in calcareous and siliceous soils of these two shrub species. Possible ecological explanations on the effect of soil type for these latter two species as well as the ecological explanation of rich terpene mixtures are discussed.

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