Comparative micromorphology of nectariferous and nectarless labellar spurs in selected clades of subtribe Orchidinae (Orchidaceae)

Bell, Alexandra K., Roberts, David L., Hawkins, Julie A., Rudall, Paula J., Box, Mathew S., Bateman, Richard M. (2009) Comparative micromorphology of nectariferous and nectarless labellar spurs in selected clades of subtribe Orchidinae (Orchidaceae). Botanical Journal of the Linnean Society, 160 (4). pp. 369-387. ISSN 0024-4074. (doi:10.1111/j.1095-8339.2009.00985.x) (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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Official URL
http://dx.doi.org/10.1111/j.1095-8339.2009.00985.x

Abstract

Floral nectar spurs are widely considered to influence pollinator behaviour in orchids. Spurs of 21 orchid species selected from within four molecularly circumscribed clades of subtribe Orchidinae (based on Platanthera s.l., Gymnadenia-Dactylorhiza s.l., Anacamptis s.l., Orchis s.s.) were examined under light and scanning electron microscopes in order to estimate correlations between nectar production (categorized as absent, trace, reservoir), interior epidermal papillae (categorized as absent, short, medium, long) and epidermal cell striations (categorized as apparently absent, weak, moderate, strong). Closely related congeneric species scored similarly, but more divergent species showed less evidence of phylogenetic constraints. Nectar secretion was negatively correlated with striations and positively correlated with papillae, which were especially frequent and large in species producing substantial reservoirs of nectar. We speculate that the primary function of the papillae is conserving energy through nectar resorption and explain the presence of large papillae in a minority of deceit-pollinated species by arguing that the papillae improve pollination because they are a tactile expectation of pollinating insects. In contrast, the prominence of striations may be a 'spandrel', simply reflecting the thickness of the overlying cuticle. Developmentally, the spur is an invagination of the labellum; it is primarily vascularized by a single 'U'-shaped primary strand, with smaller strands present in some species. Several suggestions are made for developing further, more targeted research programmes. © 2009 The Linnean Society of London.

Item Type: Article
DOI/Identification number: 10.1111/j.1095-8339.2009.00985.x
Additional information: Unmapped bibliographic data: PY - 2009/// [EPrints field already has value set] AD - Royal Botanic Gardens, Kew, Richmond, Surrey TW9 3AB, United Kingdom [Field not mapped to EPrints] AD - School of Biological Sciences, University of Reading, Reading RG6 6BX, United Kingdom [Field not mapped to EPrints] AD - Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, United Kingdom [Field not mapped to EPrints] JA - Bot. J. Linn. Soc. [Field not mapped to EPrints]
Uncontrolled keywords: Deceit, Epidermal striations, Nectar secretion, Papillae, Pollination, Resorption, Reward, correlation, micromorphology, nectar, phylogenetics, plant, plant-insect interaction, pollination, pollinator, research work, resorption, secretion, Anacamptis, Dactylorhiza, Gymnadenia, Hexapoda, Orchidaceae, Orchidinae, Orchis, Platanthera
Subjects: Q Science
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 15:35 UTC
Last Modified: 29 May 2019 10:10 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/33825 (The current URI for this page, for reference purposes)
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