Consulta: creatorFacets:"Gonçalves-Esteves,Vânia"
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Data/hora: 01/06/2024 04:51:37

Pollen morphology of Brazilian species of Verbesina L. (Heliantheae - Asteraceae)
Provedor de dados: Acta Botanica Brasilica
Autores: Moreira,Giselle Lopes; Cavalcanti,Taciana Barbosa; Mendonça,Cláudia Barbieri Ferreira; Gonçalves-Esteves,Vânia.
Abstract There are nine species of the plant genus Verbesina in Brazil, which are distributed in the Northeast, Center-West, Southeast and South regions of the country. The objective of the present study was to describe the pollinic morphology of eight of these species to better characterize them and evaluate potential species-level taxonomic characters. Acetolysed pollen material was measured within seven days under light microscopy, while non-acetolyzsed pollen grains were used for scanning electronic microscopy. The pollen grains were found to be oblate-spheroidal, medium-sized, isopolar, monads that are 3-colporate with a subtriangular amb, a small polar area, a long colpus, a lalongate endoaperture, a caveate exine and an echinate sexine. Although the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Compositae; Heliantheae; Morphology; Pollen; Verbesina.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000100128

Pollen morphology of the genera Irlbachia, Tachia, Voyria and Voyriella (Gentianaceae Juss.) found in the Reserva Florestal Adolpho Ducke (Amazonas, Brazil)
Provedor de dados: Acta Botanica Brasilica
Autores: Ferreira,Marcos Gonçalves; Absy,Maria Lúcia; Gonçalves-Esteves,Vânia.
A pollen morphology study of the Gentianaceae Juss. of Reserva Florestal Adolpho Ducke (Manaus, Brazil) was performed. The pollen grains of the studied species varied morphologically in their pollen units (tetrads or monads), size (small, medium and large), shape (oblate, suboblate, oblate spheroidal, spheroidal, prolate spheroidal and prolate), polarity (heteropolar, isopolar or subisopolar), symmetry (bilateral or radial) and number and type of aperture (3-colporate and 1-3porate). In relation to ornamentation, pollen grains had a sexine that was psilate in the Voyria species, microreticulate in Voyriella parviflora and reticulate heterobrochate in Tachia grandiflora and Irlbachia alata. The exine in I. alata showed great variability in the size and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon forest; Neotropical species; Palynology; Taxonomy.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062012000400020

Padrão polínico utilizado por Tetragonisca angustula Latreille (Apidae: Meliponina)
Provedor de dados: Acta Botanica Brasilica
Autores: Morgado,Leila Nunes; Andrade,Rebeca Cássia; Lorenzon,Maria Cristina Affonso; Gonçalves-Esteves,Vânia.
O presente estudo objetivou quantificar e avaliar a carga polínica classificada por coloração encontrada nas corbículas de Tetragonisca angustula Latreille (Apidae: Meliponina). Os grãos de pólen encontrados nas corbículas de T. angustula no período estudado foram de 18 tipos polínicos pertencentes a 16 famílias vegetais. As cores predominantes indicaram uma diversidade de tipos polínicos. A coloração amarela obteve maior riqueza de espécies, sendo indicativo de preferência de cor pela T. angustula. A cor marrom foi a que apresentou a menor freqüência de grãos de pólen e a cor abóbora com a menor riqueza de tipos polínicos. As cores com tonalidades claras foram as mais representativas em número de grãos coletados. Os tipos polínicos mais freqüentes foram...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abelha sem ferrão; Coloração de pólen; Interação planta-inseto; Palinologia.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062011000400021

Palynotaxonomy of Brazilian Viguiera (Asteraceae) Species
Provedor de dados: Boletín de la Sociedad Argentina de Botánica
Autores: Magenta,Mara Angelina Galvão; Nunes,Alessandra De Deus; Mendonça,Cláudia Barbieri Ferreira; Gonçalves-Esteves,Vânia.
With the aim of improving inter-specific delimitation of the genus Viguiera Kunth in Brazil, a palynological analysis was undertaken with 27 taxa, representing around 77% of all occurring species. Samples were obtained from herbarium specimens and the pollen grains were analyzed through light and scanning electron microscopy. Characteristics, including the shape of the pollen grains, polar and equatorial diameter, aperture measurements, surface ornamentation and exine thickness, were registered and compared. The pollen grains were medium-sized (25 - 50 mm), isopolar and oblate spheroidal (prolate spheroidal in V. aspilioides Baker). The observed values corroborated the synonymity of some species and also highlighted certain micro-morphological differences,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asteraceae; Brazil; Compositae; Pollen; Taxonomy; Viguiera.
Ano: 2010
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722010000200008