Pollination ecology of two species of (Orchidaceae): novel mechanisms and underlying adaptations to hummingbird pollination

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorNunes, Carlos E. P.
dc.creatorAmorim, Felipe Wanderley de
dc.creatorMayer, Juliana Lischka Sampaio
dc.creatorSazima, Marlies
dc.date2016-07-07T12:34:33Z
dc.date2016-10-25T21:44:04Z
dc.date2016-07-07T12:34:33Z
dc.date2016-10-25T21:44:04Z
dc.date2015
dc.date.accessioned2017-04-06T10:45:19Z
dc.date.available2017-04-06T10:45:19Z
dc.identifierPlant Biology, v. 18, n. 01, p. 15-25, 2015.
dc.identifier1435-8603
dc.identifierhttp://hdl.handle.net/11449/140584
dc.identifierhttp://acervodigital.unesp.br/handle/11449/140584
dc.identifier10.1111/plb.12312
dc.identifier2209124317273797
dc.identifier9294968535926687
dc.identifierhttp://dx.doi.org/10.1111/plb.12312
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/950870
dc.descriptionRelationships among floral biology, floral micromorphology and pollinator behaviourin bird-pollinated orchids are important issues to understand the evolution of thehuge flower diversity within Orchidaceae. We aimed to investigate floral mechanismsunderlying the interaction with pollinators in two hummingbird-pollinated orchidsoccurring in the Atlantic forest. We assessed floral biology, nectar traits, nectary andcolumn micromorphologies, breeding systems and pollinators. In both species, nectaris secreted by lip calli through spaces between the medial lamellar surfaces of epider-mal cells. Such a form of floral nectar secretion has not been previously described.Both species present functional protandry and are self-compatible yet pollinator-dependent. Fruit set in hand-pollination experiments was more than twice that undernatural conditions, evidencing pollen limitation. The absence of fruit set in interspe-cific crosses suggests the existence of post-pollination barriers between thesesympatric co-flowering species. In Elleanthus brasiliensis, fruits resulting fromcross-pollination and natural conditions were heavier than those resulting from self-pollination, suggesting advantages to cross-pollination. Hummingbirds pollinatedboth species, which share at least one pollinator species. Species differences in floralmorphologies led to distinct pollination mechanisms. In E. brasiliensis, attachment ofpollinarium to the hummingbird bill occurs through a lever apparatus formed by anappendage in the column, another novelty to our knowledge of orchid pollination. InE. crinipes, pollinarium attachment occurs by simple contact with the bill duringinsertion into the flower tube, which fits tightly around it. The novelties described hereillustrate the overlooked richness in ecology and morphophysiology in Orchidaceae.
dc.languageeng
dc.relationPlant Biology
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectEpidendroideae
dc.subjectMicromorphology
dc.subjectNectarsecretion
dc.subjectOrnithophily
dc.subjectProtandry
dc.subjectSobraliae
dc.subjectTrochilidae.
dc.titlePollination ecology of two species of (Orchidaceae): novel mechanisms and underlying adaptations to hummingbird pollination
dc.typeOtro


Este ítem pertenece a la siguiente institución