Morphology, development and homologies of the perianth and floral nectaries in Croton and Astraea (Euphorbiaceae-Malpighiales)

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dc.contributor.authorDe-Paula, Orlando Cavalari [UNESP]
dc.contributor.authorSajo, Maria das Gracas [UNESP]
dc.contributor.authorPrenner, Gerhard
dc.contributor.authorCordeiro, Ines
dc.contributor.authorRudall, Paula J.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionRoyal Bot Gardens
dc.contributor.institutionInst Bot
dc.date.accessioned2013-09-30T18:48:03Z
dc.date.accessioned2014-05-20T13:57:09Z
dc.date.available2013-09-30T18:48:03Z
dc.date.available2014-05-20T13:57:09Z
dc.date.issued2011-03-01
dc.description.abstractNew observations are presented on the ontogeny, vasculature and morphology of both staminate and pistillate flowers of Croton and Astraea. These data support earlier hypotheses that the filamentous structures in pistillate flowers represent reduced and transformed petals. Staminate flowers of both genera possess five free nectaries, which are vascularisal by divergences of the sepal traces in Croton and unvascularised in Astraea. In pistillate flowers, there are five separate non-vascularised nectaries in Astraea, but in Croton there is a single nectariferous disk that is vascularised by divergences of the sepal traces. The nectaries are initiated late in floral development, but their location indicates that they could represent the outer stamen whorl transformed into secretory staminodes. Other glandular structures occur in pistillate flowers of most Croton species, resulting in flowers with two secretory organ whorls. In these cases, the inner whorl is formed by modified staminodes. Our observations support the recent segregation of Astraea species from the larger genus Crown. Despite strong similarities between the two genera, there are clear structural differences, including the presence of colleters in Astraea (absent in Crown), moniliform trichomes on petals (rather than simple trichomes in Crown), non-vascularised nectaries (vascularised in Croton) and reduced, non-secretory filamentous structures (well developed and secretory in Croton).en
dc.description.affiliationUniv Estadual Paulista UNESP, BR-13506900 São Paulo, Brazil
dc.description.affiliationRoyal Bot Gardens, Richmond TW9 3DS, Surrey, England
dc.description.affiliationInst Bot, BR-04301012 São Paulo, Brazil
dc.description.affiliationUnespUniv Estadual Paulista UNESP, BR-13506900 São Paulo, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipKew Latin American Research Fellowship scheme
dc.description.sponsorshipIdFAPESP: 06/61641-0
dc.identifierhttp://dx.doi.org/10.1007/s00606-010-0388-9
dc.identifier.citationPlant Systematics and Evolution. Wien: Springer Wien, v. 292, n. 1-2, p. 1-14, 2011.
dc.identifier.doi10.1007/s00606-010-0388-9
dc.identifier.issn0378-2697
dc.identifier.lattes2126319926799273
dc.identifier.urihttp://hdl.handle.net/11449/20387
dc.identifier.wosWOS:000288582000001
dc.language.isoeng
dc.publisherSpringer Wien
dc.relation.ispartofPlant Systematics and Evolution
dc.relation.ispartofjcr1.452
dc.relation.ispartofsjr0,640
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectCrotoneaeen
dc.subjectEuphorbiaceaeen
dc.subjectFlowersen
dc.subjectInaperturate crotonoidsen
dc.subjectNectary evolutionen
dc.subjectObdiplostemonyen
dc.subjectPetalsen
dc.subjectStaminodesen
dc.titleMorphology, development and homologies of the perianth and floral nectaries in Croton and Astraea (Euphorbiaceae-Malpighiales)en
dc.typeArtigo
dcterms.licensehttp://www.springer.com/open+access/authors+rights?SGWID=0-176704-12-683201-0
dcterms.rightsHolderSpringer Wien
unesp.author.lattes2126319926799273
unesp.author.orcid0000-0002-8089-2082[1]
unesp.author.orcid0000-0002-2626-5280[4]
unesp.author.orcid0000-0003-4642-8769[2]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Rio Claropt

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