Floral Biology And Pollination Mechanisms In Two Viola Species - From Nectar To Pollen Flowers?

dc.creatorFreitas L.
dc.creatorSazima M.
dc.date2003
dc.date2015-06-30T17:29:08Z
dc.date2015-11-26T15:41:02Z
dc.date2015-06-30T17:29:08Z
dc.date2015-11-26T15:41:02Z
dc.date.accessioned2018-03-28T22:49:31Z
dc.date.available2018-03-28T22:49:31Z
dc.identifier
dc.identifierAnnals Of Botany. , v. 91, n. 3, p. 311 - 317, 2003.
dc.identifier3057364
dc.identifier10.1093/aob/mcg025
dc.identifierhttp://www.scopus.com/inward/record.url?eid=2-s2.0-0037369367&partnerID=40&md5=2019ce3a35b2c24abdf292cb70962f6a
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/102233
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/102233
dc.identifier2-s2.0-0037369367
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1264520
dc.descriptionThe genus Viola is represented by four related species in Brazil belonging to section Leptidium, one of the most primitive sections in the genus. Floral biology and pollination by bees were studied in Viola cerasifolia and V. subdimidiata in high-altitude areas in south-eastern Brazil. Flowers are zygomorphic and spurred. The five stamens are arranged in a cuff around the ovary, and pollen is released by means of apical connective projections, which form a cone surrounding the base of the style. The connective projections of the inferior stamens are elongated and curved to form a hook-shaped structure. Nectar-secreting tissue can occur in the basal connective appendages of the inferior stamens, which project into the spur. Flowers of V. subdimidiata secreted a mean volume of 0.14 μl nectar over a 24-h period; approx. 40 % of flowers did not secrete any nectar. The main pollinators of these Viola species are female bees belonging to the genus Anthrenoides (Andrenidae), which search mainly for pollen. These bees seem to be oligolectic and obtain large amounts of pollen from Viola by vibrating the flowers or by moving the hook repeatedly back and forth. Males of Anthrenoides patrol Viola clusters and also feed on nectar, acting as secondary pollinators. The basic floral structure in the genus Viola fits that of 'nectar flowers'. The uncommon hook-shaped projections, scanty nectar production, and behaviour of pollinators suggest that V. cerasifolia and V. subdimidiata are shifting their reward for pollinators from nectar to pollen. Based on floral morphology, this shift may be widespread in Viola sect. Leptidium. © 2003 Annals of Botany Company.
dc.description91
dc.description3
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dc.languageen
dc.publisher
dc.relationAnnals of Botany
dc.rightsfechado
dc.sourceScopus
dc.titleFloral Biology And Pollination Mechanisms In Two Viola Species - From Nectar To Pollen Flowers?
dc.typeArtículos de revistas


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