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AOBPreview originally published online on January 16, 2003
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Annals of Botany 91: 439-446, 2003
© 2003 Annals of Botany Company

Lipoidal Labellar Secretions in Maxillaria Ruiz & Pav. (Orchidaceae)

K. L. DAVIES*,1, M. P. TURNER2 and A. GREGG3

1 Department of Earth Sciences, Cardiff University, PO Box 914, Cardiff CF10 3YE, UK, 2 School of Biosciences, Cardiff University, PO Box 915, Cardiff CF10 3TL, UK and 3 Swansea Botanical Complex, Singleton Park, Swansea SA2 9DU, UK

* For correspondence.

Received: 28 August 2002; Returned for revision: 4 November 2002; Accepted: 19 November 2002    Published electronically: 16 January 2003

The labella of Maxillaria acuminata Lindl., M. cerifera Barb. Rodr. and M. notylioglossa Rchb.f., all members of the M. acuminata alliance, produce a viscid wax-like secretion. Histochemical analysis revealed that the chemical composition of the secretion is similar in all three species, consisting largely of lipid and protein. Light microscopy and low-vacuum scanning electron microscopy were used to investigate the secretory process. In a fourth taxon, M. cf. notylioglossa, transmission electron microscopy showed that lipid bodies are associated with smooth endoplasmic reticulum or occur as plastoglobuli within plastids. Lipid bodies vary in appearance and this may reflect differences in chemical composition. They become associated with the plasmalemma and eventually accumulate between the latter and the cell wall. The wall contains no pits or ectodesmata, and it is speculated that lipid passes through the wall as small lipid moieties before eventually reassembling to form lipid globules on the external surface of the cuticle. These globules are able to coalesce forming extensive viscid areas on the labellum. The possible significance of this process to pollination is discussed.

Key words: Histochemistry, labellum, lipids, low-vacuum scanning electron microscopy, SEM, Maxillaria, papillae, pollination, transmission electron microscopy, TEM, ultrastructure, wax.


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