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AOBPreview originally published online on April 27, 2007
Annals of Botany 2007 99(6):1111-1119; doi:10.1093/aob/mcm064
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© The Author 2007. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

INVITED REVIEW

Morphology and Histochemistry of the Glandular Trichomes of Lippia scaberrima (Verbenaceae)

S. Combrinck*, G. W. Du Plooy, R. I. McCrindle and B. M. Botha

Department of Chemistry and Physics, Tshwane University of Technology, PO Box 56208, Pretoria 0001, South Africa

* For correspondence. E-mail combrincks{at}tut.ac.za

Received: 5 December 2006    Returned for revision: 10 January 2007    Accepted: 12 February 2007    Published electronically: 27 April 2007

Background and Aims: Lippia scaberrima, an aromatic indigenous South African plant, with medicinal application, potentially has economic value. The production of essential oil from this plant has not been optimized, and this study of the chemico-morphological characteristics was aimed at determining the location of oil production within the plant. Furthermore, the locality of other secondary metabolites important in medicinal applications needed to be ascertained. This information would be useful in deciding the protocol required for isolation of such compounds.

Methods: The morphology of the glandular trichomes was investigated using a combination of scanning electron and light microscopy. Concurrently, the chemical content was studied by applying various chemical reagents and fluorescence microscopy.

Key Results: Three types of trichomes were distinguished on the material investigated. Large, bulbous peltate glands containing compounds of terpenoid nature are probably the main site of essential oil accumulation. Small glands were found to be both peltate and capitate and fluorescent stain indicated the possible presence of phenolic compounds. The third type was a slender tapered seta with an ornamented surface and uniseriate base, and evidently secretory in nature.

Conclusions: This study linking the chemical content and morphology of the glandular trichomes of L. scaberrima has contributed to the knowledge and understanding of secretory structures of Lippia spp. in general.

Key words: Lippia scaberrima, Verbenaceae, trichomes, setae, terpenoids, phenolics, microscopy, staining, fluorescence


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