Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/77405
Type: Artigo de periódico
Title: Anatomy of the floral nectary of ornithophilous Elleanthus brasiliensis (Orchidaceae: Sobralieae)
Author: Nunes, CEP
Castro, MD
Galetto, L
Sazima, M
Abstract: Orchidaceae show enormous floral diversity. However, anatomical studies of nectary tissues relative to nectar composition and pollinators are scarce. This work aims to present a detailed anatomical study of the labellar nectary of Elleanthusbrasiliensis, analyse the chemical composition of its nectar and relate these findings to pollination biology. Basally, the labellum bears a pair of fleshy, whitish, ovoid calli on its adaxial surface. Nectariferous callus tissue consists of a papillate epidermis and enlarged subepidermal parenchyma cells with thin walls, large nuclei and dense cytoplasm which stained positively for hydrophilic substances, interpreted as pre-nectar. The paired calli lack vascular tissues, but at the point of callus insertion, the diameters of vascular bundles supplying the lip are larger. Nectar is secreted as droplets on the adaxial callus surface. It is produced in small quantities, c. 4L per flower. Callus cell contents tested negative for polysaccharides, lipids and phenolic compounds. The nectar is sucrose-dominant, as in other hummingbird-pollinated species. It is suggested that other ornithophilous species of Sobralieae have anatomically similar nectaries.(c) 2013 The Linnean Society of London, Botanical Journal of the Linnean Society, 2013, 171, 764772.
Subject: Atlantic Rainforest
callus
glands
histochemistry
labellum
lip
nectar
orchid
pollination
secretion
Country: EUA
Editor: Wiley-blackwell
Rights: fechado
Identifier DOI: 10.1111/boj.12024
Date Issue: 2013
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

Files in This Item:
There are no files associated with this item.


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.