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Annals of Botany 89: 255-260, 2002
© 2002 Annals of Botany Company

The Essential Oil Secretory Structures of Prostanthera ovalifolia (Lamiaceae)

P. V. GERSBACH*,1

1Centre for Biostructural & Biomolecular Research, University of Western Sydney, Richmond, NSW 2753, Australia

* For correspondence. E-mail p_gersbach{at}hotmail.com

Received: 13 June 2001; Returned for revision: 3 October 2001; Accepted: 13 November 2001.

The structure of the essential oil secretory tissues of Prostanthera ovalifolia R.Br was investigated using bright- and dark-field optical microscopy, and scanning and transmission electron microscopy. The leaves of P. ovalifolia have glandular trichomes of the peltate type common to many Lamiaceae species. The trichomes consist of a basal cell embedded in the epidermis, a stalk cell with heavily cutinized walls and a 16-celled secretory head, but they differ from those of many previously reported Lamiaceae species in their morphological form defined by the elevated cuticle. The sub-cuticular space contains a mixture of lipid and aqueous phases. Secretory cells have dense cytoplasm with many leucoplasts present. Volatile terpenoids are eliminated from the cytoplasm into the sub-cuticular space, the site of essential oil accumulation, via granulocrine secretion.

Key words: Trichomes, Lamiaceae, secretion, essential oil, volatile terpenoids, Prostanthera ovalifolia, optical microscopy, electron microscopy.


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