Pollen Flow
Mostrando 1-12 de 53 artigos, teses e dissertações.
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1. Pollination biology of the endangered columnar cactus Cipocereus crassisepalus: a case of close relationship between plant and pollinator
ABSTRACT The family Cactaceae possesses considerable floral diversity and is exclusively zoophilic. Cipocereus crassisepalus is an endangered species of columnar cactus, whose floral characteristics fit the chiropterophily syndrome. This study aimed to assess the correspondence between floral traits and pollinators and whether the pollination system of C. cr
Acta Bot. Bras.. Publicado em: 2020-03
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2. Bees Diversity on Flowers of Eremanthus spp. (Asteraceae)
ABSTRACT Bees are considered important pollinators due to their fidelity to plants, enabling the maintenance of gene flow between plant species. The objective of this study was to recognize the visit of bees in two Candeia species, Eremanthus erythropappus and Eremanthus incanus (Asteraceae), as well as to analyze the pollen content carried by bees in a rege
Floresta Ambient.. Publicado em: 29/08/2019
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3. Nectar dynamics and reproductive biology of Passiflora actinia Hook. (Passifloraceae) in Araucaria Forest
ABSTRACT Nectar production has an important role in pollinator attraction and successful fruit production in many self-incompatible angiosperm groups. The reproductive biology of Passiflora actinia was studied here and related to nectar dynamics. Passiflora actinia presented a temporal segregation of male and female functions at the beginning of anthesis. Du
Acta Bot. Bras.. Publicado em: 02/07/2018
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4. Genetic and ecological niche modeling of Calydorea crocoides (Iridaceae): an endemic species of Subtropical Highland Grasslands
Abstract Evolutionary analyses have been widely used for evaluation of genetic diversity of natural populations and correlate these data to the fitness of the species, especially in the case of threatened species. Calydorea crocoides occurs in a restricted area at altitudes from 800 to 1500 m in southern Brazil and is considered endangered. A study assessing
Genet. Mol. Biol.. Publicado em: 2018
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5. Obtaining tetraploid plants of ruzigrass (Brachiaria ruziziensis)
The objective of the present work was to induce chromosome doubling in genotypes of Brachiaria ruziziensis with potential for production of good-quality biomass and tolerance/resistance to stress caused by aluminum and spittlebugs. Germinated seeds of B. ruziziensis were immersed in 0.1% colchicine solution for 2 or 3 hours. Ploidy level was determined by fl
R. Bras. Zootec.. Publicado em: 2014-03
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6. Selection of forest fragments to seed harvest in Itapemirim river watershed and around the Caparaó National Park / Seleção de fragmentos florestais para a colheita de sementes na bacia hidrográfica do rio Itapemirim e entorno do Parque Nacional do Caparaó
Forest fragments are the natural vegetation interrupted by anthropogenic or natural barriers, able to reduce significantly the flow of animals, pollen or seeds. The edge, the type of neighborhood, the degree of isolation and the effective size of forest fragments are the main factors that should be considered to measure changes in biological processes of a p
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/12/2012
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7. Cultura de anteras e partenogênese in situ e in vitro de genótipos de laranja doce (Citrus sinensis Osbeck.) / Anther culture and in vitro and in situ parthenogenesis of sweet orange (Citrus sinensis Osbeck.) genotypes
The production of completely homozygous lines in citrus breeding program is hard, and double-haploid plantlets (completely homozygous lines) can be used to improve these breeding programs. However, many factors are associated with the success of the regeneration of haploid or double-haploid plants. The aim of this study was the induction and regeneration of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/06/2012
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8. Pollen and seed flow patterns of Carapa guianensis Aublet. (Meliaceae) in two types of Amazonian forest
Various factors affect spatial genetic structure in plant populations, including adult density and primary and secondary seed dispersal mechanisms. We evaluated pollen and seed dispersal distances and spatial genetic structure of Carapa guianensis Aublet. (Meliaceae) in occasionally inundated and terra firme forest environments that differed in tree densitie
Genet. Mol. Biol.. Publicado em: 16/10/2012
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9. Genetics, evolution and conservation of Bromeliaceae
Bromeliaceae is a morphologically distinctive and ecologically diverse family originating in the New World. Three centers of diversity, 58 genera, and about 3,140 bromeliad species are currently recognized. We compiled all of the studies related to the reproductive biology, genetic diversity, and population structure of the Bromeliaceae, and discuss the evol
Genet. Mol. Biol.. Publicado em: 2012
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10. Estrutura genética e ecologia de comunidades das abelhas Euglossini (Hymenoptera; Apidae) do Parque Estadual da Serra do Mar e Parque Estadual da Ilha Anchieta, Ubatuba, SP, Brasil / Genetic structure and community ecology of Euglossine bees (Hymenoptera, Apidae) of Parque Estadual da Serra do Mar and Parque Estadual da Ilha Anchieta in Ubatuba, São Paulo State, Brazil
A Mata Atlântica é considerada uma das grandes prioridades para a conservação de biodiversidade em todo o continente americano. Este bioma é um dos oito hotspots do planeta e caracteriza-se pelo alto grau de endemismo e pela alta diversidade de espécies que encerra. As abelhas Euglossini estão restritas à região Neotropical, com uma faixa de distrib
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/03/2011
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11. Gene flow from transgenic common beans expressing the bar gene.
Gene flow is a common phenomenon even in self-pollinated plant species. With the advent of genetically modified plants this subject has become of the utmost importance due to the need for controlling the spread of transgenes. This study was conducted to determine the occurrence and intensity of outcrossing in transgenic common beans. In order to evaluate the
GM Crops. Publicado em: 2011
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12. Biologia da polinização, reprodução e genética de duas populações de Tibouchina pulchra Cogn. (Melastomataceae) em gradiente altitudinal no sudeste do Brasil / Pollination, reproductive biology and genetic of two populations of Tibouchina pulchra Cogn. (Melastomataceae) at altitudinal gradient in southeastern Brazil
As montanhas apresentam alta diversidade e diferentes condições ambientais ao longo de curtas distâncias. Assim, as montanhas são ideais para estudos ecológicos e evolutivos que podem somar valores e aprimorar projetos de conservação. Em altitudes elevadas as condições ambientais podem reduzir a quantidade de polinizadores, principalmente de abelhas
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/07/2010