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PLoS One. 2012;7(10):e48253. doi: 10.1371/journal.pone.0048253. Epub 2012 Oct 25.

Extracellular localization of the diterpene sclareol in clary sage (Salvia sclarea L., Lamiaceae).

Author information

1
Laboratoire de Biotechnologies Végétales Appliquées aux Plantes Aromatiques et Médicinales, Université Jean Monnet, Université de Lyon, Saint-Etienne, France. caissard@univ-st-etienne.fr

Abstract

Sclareol is a high-value natural product obtained by solid/liquid extraction of clary sage (Salvia sclarea L.) inflorescences. Because processes of excretion and accumulation of this labdane diterpene are unknown, the aim of this work was to gain knowledge on its sites of accumulation in planta. Samples were collected in natura or during different steps of the industrial process of extraction (steam distillation and solid/liquid extraction). Samples were then analysed with a combination of complementary analytical techniques (gas chromatography coupled to a mass spectrometer, polarized light microscopy, environmental scanning electron microscopy, two-photon fluorescence microscopy, second harmonic generation microscopy). According to the literature, it is hypothesized that sclareol is localized in oil pockets of secretory trichomes. This study demonstrates that this is not the case and that sclareol accumulates in a crystalline epicuticular form, mostly on calyces.

PMID:
23133579
PMCID:
PMC3484996
DOI:
10.1371/journal.pone.0048253
[Indexed for MEDLINE]
Free PMC Article

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