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Pseudopollen and food-hair diversity in Polystachya Hook. (Orchidaceae)

Davies, K.L., Roberts, David L., Turner, M.P. (2002) Pseudopollen and food-hair diversity in Polystachya Hook. (Orchidaceae). Annals of Botany, 90 (4). pp. 477-484. ISSN 03057364 (ISSN). (doi:10.1093/aob/mcf220) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Abstract

Labellar food-hairs in Polystachya Hook. exhibit considerable morphological diversity. The commonest type of trichome is uniseriate, two to four-celled, with a clavate or subclavate terminal cell. This type occurs amongst representatives of most sections examined. Other trichomes are bristle-like with tapering or fusiform terminal cells, whereas representatives of section Polystachya have uniseriate, moniliform trichomes that fragment with the formation of rounded or elliptical component cells. Most contain protein and, while some contain starch, lipid is invariably absent. The presence of particular types of labellar trichomes does not coincide with variations in vegetative morphology. Thus, current taxonomic treatment of the genus indicates that trichome types, with perhaps the sole exception of moniliform, pseudopollen-forming hairs found in section Polystachya only, have limited taxonomic value. However, the remarkable similarity between pseudopollen-forming hairs of Polystachya and those of the Neotropical genus Maxillaria in terms of morphology, cellular dimensions and food content indicates that pseudopollen may have arisen several times and evolved in response to similar pollinator pressures. © 2002 Annals of Botany Company.

Item Type: Article
DOI/Identification number: 10.1093/aob/mcf220
Additional information: Unmapped bibliographic data: PY - 2002/// [EPrints field already has value set] AD - Department of Earth Sciences, Cardiff University, PO Box 914, Cardiff CF10 3YE, United Kingdom [Field not mapped to EPrints] AD - Royal Botanic Gardens, Kew, Richmond, Surrey TW9 3AB, United Kingdom [Field not mapped to EPrints] AD - School of Biosciences, Cardiff University, PO Box 915, Cardiff CF10 3TL, United Kingdom [Field not mapped to EPrints] JA - Ann. Bot. [Field not mapped to EPrints]
Uncontrolled keywords: Histochemistry, Low-vacuum scanning electron microscopy, Pollination, Taxonomy, Trichomes, starch, vegetable protein, morphology, pollination, trichome, article, cell surface, chemistry, cytochemistry, electron microscopy, growth, development and aging, lipid metabolism, metabolism, methodology, Orchidaceae, physiology, pollen, ultrastructure, Cell Surface Extensions, Histocytochemistry, Lipid Metabolism, Microscopy, Electron, Orchidaceae, Plant Proteins, Pollen, Starch, Maxillaria, Orchidaceae, Polystachya
Subjects: Q Science
Q Science > QH Natural history
Q Science > QK Botany
Divisions: Faculties > Social Sciences > School of Anthropology and Conservation
Faculties > Social Sciences > School of Anthropology and Conservation > DICE (Durrell Institute of Conservation and Ecology)
Depositing User: David Roberts
Date Deposited: 20 Feb 2014 15:17 UTC
Last Modified: 29 May 2019 10:10 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/33848 (The current URI for this page, for reference purposes)
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