Functional aspects of floral nectar secretion of Ananas ananassoides, an ornithophilous bromeliad from the Brazilian savanna

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dc.contributor.authorStahl, Juliana Marin [UNESP]
dc.contributor.authorNepi, Massimo
dc.contributor.authorGaletto, Leonardo
dc.contributor.authorGuimaraes, Elza [UNESP]
dc.contributor.authorMachado, Silvia Rodrigues [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniv Siena
dc.contributor.institutionUniv Nacl Cordoba
dc.date.accessioned2014-05-20T13:48:45Z
dc.date.available2014-05-20T13:48:45Z
dc.date.issued2012-06-01
dc.description.abstractSeveral members of Bromeliaceae show adaptations for hummingbird pollination in the Neotropics; however, the relationships between floral structure, nectar production, pollination and pollinators are poorly understood. The main goal of this study was to analyse the functional aspects of nectar secretion related to interaction with pollinators by evaluating floral biology, cellular and sub-cellular anatomy of the septal nectary and nectar composition of Ananas ananassoides, including an experimental approach to nectar dynamics.Observations on floral anthesis and visitors were conducted in a population of A. ananassoides in the Brazilian savanna. Nectary samples were processed using standard methods for light and transmission electron microscopy. The main metabolites in nectary tissue were detected via histochemistry. Sugar composition was analysed by high-performance liquid chromatography (HPLC). The accumulated nectar was determined from bagged flowers (ounvisited'), and floral response to repeated nectar removal was evaluated in an experimental design simulating multiple visits by pollinators to the same flowers (ovisited') over the course of anthesis.The hummingbirds Hylocharis chrysura and Thalurania glaucopis were the most frequent pollinators. The interlocular septal nectary, composed of three lenticular canals, extends from the ovary base to the style base. It consists of a secretory epithelium and nectary parenchyma rich in starch grains, which are hydrolysed during nectar secretion. The median volume of nectar in recently opened ounvisited' flowers was 270 L, with a mean (sucrose-dominated) sugar concentration of 305 . Anthesis lasts approx. 11 h, and nectar secretion begins before sunrise. In ovisited' flowers (experimentally emptied every hour) the nectar total production per flower was significantly higher than in the ounvisited' flowers (control) in terms of volume (t 494, P 00001) and mass of sugar (t 295, P 0007), and the concentration was significantly lower (t 804, P 00001).The data suggest that the total production of floral nectar in A. ananassoides is linked to the pollinators activity and that the rapid renewal of nectar is related to the nectary morphological features.en
dc.description.affiliationUniv Estadual Paulista, UNESP, Inst Biosci, Dept Bot, BR-18618000 Jaboticabal, SP, Brazil
dc.description.affiliationUniv Siena, Dept Environm Sci, I-53100 Siena, Italy
dc.description.affiliationUniv Nacl Cordoba, CONICET CC 495, Inst Multidisciplinario Biol Vegetal, RA-5000 Cordoba, Argentina
dc.description.affiliationUnespUniv Estadual Paulista, UNESP, Inst Biosci, Dept Bot, BR-18618000 Jaboticabal, SP, Brazil
dc.description.sponsorshipSECyT (Universidad Nacional de Cordoba)
dc.description.sponsorshipConsejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipIdFAPESP: 08/55434
dc.description.sponsorshipIdFAPESP: 08/55433
dc.description.sponsorshipIdCNPq: 470649/2008
dc.description.sponsorshipIdCNPq: 301464/2008
dc.format.extent1243-1252
dc.identifierhttp://dx.doi.org/10.1093/aob/mcs053
dc.identifier.citationAnnals of Botany. Oxford: Oxford Univ Press, v. 109, n. 7, p. 1243-1252, 2012.
dc.identifier.doi10.1093/aob/mcs053
dc.identifier.issn0305-7364
dc.identifier.lattes2653496390637757
dc.identifier.urihttp://hdl.handle.net/11449/17362
dc.identifier.wosWOS:000304532300004
dc.language.isoeng
dc.publisherOxford University Press
dc.relation.ispartofAnnals of Botany
dc.relation.ispartofjcr3.646
dc.relation.ispartofsjr1,721
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectAnanas ananassoidesen
dc.subjectBromeliaceaeen
dc.subjectornithophilyen
dc.subjectnectary structureen
dc.subjectnectar secretion processen
dc.subjectsugar compositionen
dc.titleFunctional aspects of floral nectar secretion of Ananas ananassoides, an ornithophilous bromeliad from the Brazilian savannaen
dc.typeArtigo
dcterms.licensehttp://www.oxfordjournals.org/access_purchase/self-archiving_policyh.html
dcterms.rightsHolderOxford Univ Press
unesp.author.lattes2653496390637757
unesp.author.orcid0000-0002-1006-357X[4]
unesp.author.orcid0000-0002-6765-897X[2]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Botucatupt

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