Consulta: subjectFacets:"Velloziaceae"
Registros recuperados: 8
Data/hora: 02/06/2024 11:56:15

Germinação, tolerância à dessecação e ao congelamento de sementes de Vellozia squamata Pohl: germinação e conservação ex situ da canela-de-ema.
Provedor de dados: 14
Autores: SILVA, D. A. da.
bitstream/item/225477/1/Boletim-caneladeema-3731.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Canela-de-ema; Conservação ex situ; Cerrado; Conservação; Velloziaceae; Ex situ conservation.
Ano: 2021
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1133855

Novitates Velloziacearum florae phanerogamicae Sancti Pauli
Provedor de dados: 88
Autores: Mello-Silva,Renato de.
São descritas duas espécies novas de Velloziaceae do norte de São Paulo e áreas adjacentes de Minas Gerais, Vellozia obtecta e V. peripherica. São discutidos suas relações taxonômicas e os caracteres que as sustentam como novas. São fornecidas também descrições anatômicas da lâmina foliar e do pedicelo. A sinonimização de Barbacenia fragrans e B. tricolor sob B. tomentosa é também apresentada e discutida.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brasil; Espécies novas; Minas Gerais; São Paulo; Sinônimos novos; Velloziaceae.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042004000300006

Ontogenesis of stomata in Velloziaceae: paracytic versus tetracytic?
Provedor de dados: 88
Autores: Amaral,Marina Milanello do; Mello-Silva,Renato de.
In Velloziaceae, the number of subsidiary cells has been used to characterize species and support groups. Nevertheless, the homology of the stomatal types have not been scrutinized. Stomatal ontogenesis of Vellozia epidendroides and V. plicata, assigned to have tetracytic stomata, and of V. glauca and Barbacenia riparia, assigned to have paracytic stomata, were investigated. In the four species studied, stomata followed perigenic development. Subsidiary cells arise from oblique divisions of neighbouring cells of the guard mother cell (GMC). These cells are elongated and parallel to the longer axis of the stoma. Polar cells show wide variation, following the shape and size of the epidermal cells in the vicinity. Hence, these cells cannot be called...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ontogenesis; Paracytic; Stomata; Tetracytic; Velloziaceae.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042008000300016

Comportamento germinativo de três espécies de Vellozia da Serra do Cipó, MG
Provedor de dados: 39
Autores: Garcia,Queila Souza; Diniz,Izabella Scalabrini Saraiva.
Este trabalho teve como objetivo avaliar o comportamento germinativo de Vellozia gigantea N.L. Menezes &amp;amp; Mello-Silva, Vellozia glandulifera Goethart &amp;amp; Henrard e Vellozia variabilis Mart. ex Schult. &amp;amp; Schult. Os experimentos de germinação foram realizados em câmaras de germinação sob luz e escuro contínuos, nas temperaturas constantes de 15, 20, 25, 30, 35 e 40ºC. As sementes das espécies estudadas apresentaram altas percentagens de germinação na presença de luz nas temperaturas de 20 a 40ºC, sendo que V. glandulifera foi a única espécie cujas sementes germinaram na temperatura de 15ºC. No escuro, as sementes de V. glandulifera germinaram nas temperaturas de 20 a 40ºC, apresentando percentagens de germinação inferiores a 30%. As...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vellozia; Velloziaceae; Comportamento germinativo; Fotoblastismo positivo; Germinação.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062003000400001

More is not always better: responses of the endemic plant Vellozia nanuzae to additional nutrients
Provedor de dados: 39
Autores: Cunha-Blum,Jessica; Oki,Yumi; Solar,Ricardo; Fernandes,Geraldo Wilson.
ABSTRACT Soil nutrients are one of the main drivers of plant species composition and distribution, mainly due to the role they play in plant survival and reproductive success. However, the nutritional requirements of plants inhabiting their native ecosystems are still poorly known. This is the case for most species of campo rupestre vegetation, which are found on infertile soils of quartzitic and ferruginous origin. The present study evaluated the effects of macronutrients and substrates on survival and growth of the micro-endemic Vellozia nanuzae (Velloziaceae). Plant mortality was about 95 % higher in soil enriched with macronutrients and almost 100 % in soils with added manure in the first 30 days. Individual plants from treatments with added nutrients...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Campo rupestre; Plant nutrition; Rupestrian grasslands; Soil nutrients; Velloziaceae.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000300487

Post-fire flowering and fruiting in Vellozia sincorana, a caulescent rosette plant endemic to Northeast Brazil
Provedor de dados: 39
Autores: Conceição,Abel Augusto; Orr,Barron J.
Vellozia sincorana L.B. Sm. &amp;amp; Ayensu, an endemic of campos rupestres, is an endangered species collected by local people to start cooking fires due to the flammability of its resinous stems. A massive flowering of V. sincorana following a wildfire in October 1999 raised some questions: Does fire affect flowering and fruiting of V. sincorana? Is the height of individuals correlated with flowering and fruit production? A wildfire event on 8 November 2008 provided an opportunity to explore these questions. Two populations of V. sincorana in two campos rupestres sites (12º31'S - 41º29'W; 12º36'S - 41º28'W) on ridgetops in the Chapada Diamantina National Park (Brazil) were monitored, one burned in the November 2008 fire and the other unburned since the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chapada Diamantina; Phenology; Rupestrian fields; Useful plant; Velloziaceae.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062012000100011

Chemical constituents from Vellozia graminifolia (Velloziaceae)
Provedor de dados: 42
Autores: Branco,Alexsandro; Pinto,Angelo C.; Braz Filho,Raimundo.
From the hexane and ethyl acetate extracts obtained from stems, roots and leaf sheaths of Vellozia graminifolia, a mixture of linear hydrocarbons, a mixture of pentacyclic triterpenes, five monoisoprenylated flavonoids and one labdane diterpene, (-)-ent-3beta-hydroxy-8(17)-labden-15-oic acid, were isolated. The linear hydrocarbons and minor triterpenes were identified in their corresponding mixtures by High Resolution Gas Chromatography (HRGC) and HRGC coupled to mass spectrometry. The major pentacyclic triterpenes and the diterpene were characterized by spectral data, including 2D NMR experiments, and chemical transformations.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vellozia graminifolia; Velloziaceae; Triterpenes; Diterpene; Flavonoids.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000300005

In Vitro study of Vellozia pusilla pohl (Velloziaceae), a Brazilian plant species: antitumoral activity and labeling of blood elements
Provedor de dados: 52
Autores: Dantas,Ana Letícia Almeida; Valente,Lígia Maria Marino; Morais,Lilia Aparecida Salgado de; Feliciano,Glaucio; Bernardo-Filho,Mário.
Vellozia pusilla Pohl is a species of the botanic family Velloziaceae that occurs in the subtropical regions of South America and, although it lives under conditions of high solar irradiation and low water availability, shows great longevity. The methanol extract of roots, stem and leaf sheaths of this species showed an antitumoral activity through the inhibition of the enzyme Topoisomerase I when analyzed by an in vitro bioassay employing DNA repair or recombination deficient mutants of the yeast Saccharomyces cerevisiae. In the evaluation of the effect of Vellozia pusilla methanol extract on the labeling of RBC, blood of mice was treated with 99mTc tracer solutions. The percentage of radioactivity (%ATI) bound to plasma (P) and blood cells (BC) was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drug interaction; Antitumoral activity; Technetium-99m; Blood elements; Velloziaceae.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000700008