Página 1 dos resultados de 484 itens digitais encontrados em 0.007 segundos

"Estudo do desenvolvimento floral em espécies arbóreas da família Meliaceae"; Floral development in woody species of the Meliaceae family

Gouvêa, Cantidio Fernando
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 25/08/2005 PT
Relevância na Pesquisa
46.39%
A família Meliaceae compreende cerca de 51 gêneros e 550 espécies distribuídas principalmente na região Neotropical. Incluídas nesta família, estão espécies de elevado interesse comercial para a produção de madeiras nobres. Há carência de informações quanto à biologia floral dessas espécies, que aliada a problemas silviculturas dificulta a elaboração de programas efetivos de melhoramento genético das espécies de interesse econômico da família. O presente trabalho visa contribuir para o entendimento do desenvolvimento floral na família Meliaceae, com destaque para sete espécies de interesse econômico e/ou ecológico: Cedrela fissilis L., Cedrela odorata L., Swietenia macrophylla R. A. King, Trichilia claussenii C. DC., Guarea guidonea (L.) Sleumer, Toona ciliata M. J. Roem e Melia azedarach L. Para os estudos morfo-anatômicos utilizaram-se técnicas de microscopia óptica e microscopia eletrônica de varredura. Analisou-se igualmente o padrão de expressão de genes do modelo ABC, relacionados ao desenvolvimento floral, via hibridização in situ. Os estudos morfo-anatômicos permitiram caracterizar o desenvolvimento dos primórdios dos órgãos florais e o estabelecimento de estágios arbitrários de desenvolvimento...

Estrutura floral de Galipeinae (Rutaceae) e suas implicações na sistemática, evolução e biologia do grupo; Floral structure in Galipeinae (Rutaceae) and its implications in the evolution, systematics and biology of the group

El Ottra, Juliana Hanna Leite
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 03/12/2014 PT
Relevância na Pesquisa
56.64%
Galipeinae (Galipeeae, Rutoideae) é a subtribo mais diversificada de Rutaceae na região Neotropical. Evidências moleculares recentes sustentam a monofilia do grupo. Embora a delimitação dos gêneros e espécies da subtribo seja baseada principalmente em características florais, existem poucos estudos detalhados sobre a estrutura floral de representantes da subtribo, o que dificulta o uso acurado dos caracteres florais em estudos sobre sistemática e evolução do grupo. Além disso, pouco se sabe sobre as implicações funcionais dessas características na biologia das espécies, sendo necessários mais estudos ecológicos, ainda escassos sobre o grupo. Neste contexto, analisamos comparativamente a estrutura floral de diversos gêneros de Galipeinae e de gêneros americanos proximamente relacionados, apresentando descrições detalhadas e discutindo a implicação dos resultados na sistemática e evolução do grupo. Adicionalmente, investigamos as implicações funcionais de algumas características florais de Galipeinae, por meio do estudo da biologia floral e polinização de três táxons do grupo (Almeidea rubra, Conchocarpus macrophyllus e Angostura bracteata), e com base em dados da literatura e de observações pontuais feitas sobre outras espécies. Como principais resultados das análises estruturais...

Entomofauna visitante de Belamcanda chinensis (L.) DC (Iridaceae) durante o período de floração

Vitali, Maria de Jesus; Dutra, João Clovis Stanzani; Machado, Vera Lígia Letízio
Fonte: Sociedade Brasileira de Zoologia Publicador: Sociedade Brasileira de Zoologia
Tipo: Artigo de Revista Científica Formato: 239-250
POR
Relevância na Pesquisa
46.42%
A study of the reproductive biology of B. chinensis (L.) DC. (Iridaceae) was realized comprising floral biology and breeding systems. The floral biology studies included analyses of nectar production, occurence of osmophores, corolla pigments, ultraviolet reflexion and absortion patterns, viability of pollen, pollinators and flower visitors. The breeding systems were studied taking into account the results of manual pollinators tests. B. chinensis is self-compatible bul cross-pollination is more frequent. The effective pollinators are Plebeia droryana (Friese, 1906) (45,7%), Trigona spinipes (Fabricius, 1793) (27,3%), Tetragonisca angustula (Latreille, 1811) (9,3%). Others insects visitors are considered nectar and pollen thieves. The flowering begins generally in January and February. The complete reproductive cicle, as here considered, begining with floral bud production ending with development of mature fruits, lasts January to June. Seed dispersion is ornitocoric.

Biologia floral e reprodutiva e anatomia do labelo de Cyrtopodium polyphyllum Vell. (Orchidaceae, cyrtopodiinae); Floral and reproductive biology and lip anatomy of Cyrtopodium polyphyllum Vell. (Orchidaceae, cyrtopodiinae)

Ludmila Mickeliunas
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 13/02/2007 PT
Relevância na Pesquisa
46.46%
O gênero Cyrtopodium Schltr. apresenta cerca de 42 espécies, sendo que 28 delas ocorrem no Brasil. Entre essas espécies Cyrtopodium polyphyllum Vell. (Sinônimo: Cyrtopodium paranaense Schltr.) ocorre, principalmente, na região litorânea do sul e sudeste brasileiros. As duas populações estudadas ocorrem na planície litorânea de Picinguaba e Praia da Fortaleza, Ubatuba-SP. Em ambas as regiões foram estudadas a fenologia, a morfologia floral, a anatomia do labelo, bem como observados os visitantes florais e identificados os mecanismos de polinização de C. polyphyllum. Também foram feitos experimentos para verificar o sistema reprodutivo da espécie. A quantidade de sementes potencialmente viáveis obtidas em cada tratamento, bem como a taxa de frutificação em ambiente natural foram determinadas para avaliar o sucesso reprodutivo. Os resultados dos estudos anatômicos foram comparados com os de outra espécie de Cyrtopodiinae, Grobya amherstiae Lindl. Cyrtopodium polyphyllum não oferece recursos aos seus polinizadores, que são atraídos às flores por engano. Cyrtopodium polyphyllum ocorre simpatricamente e, aparentemente, mimetiza flores de outras espécies que oferecem recursos, como Crotalaria incana (Fabaceae) e Stigmaphyllon sp. (Malpiguiaceae). Além da polinização por fator biótico...

Biologia floral, reprodução e filogenia do genêro Cirrhaea Lindl. (Orchidaceae) e evolução dos sistemas de polinização em Stanhopeinae; Floral biology, reproduction and phylogeny of genus Cirrhaea Lindl. (Orchidaceae) and the evolution of pollination sytems in Stanhopeinae

Ludmila Mickeliunas Pansarin
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 14/02/2011 PT
Relevância na Pesquisa
46.4%
O gênero Cirrhaea Lindl. (Orchidaceae) inclui sete espécies distribuídas principalmente pela região Sudeste do Brasil. Neste trabalho foram estudadas a fenologia, a biologia floral e reprodutiva das espécies de Cirrhaea, bem como a morfologia e a anatomia de suas estruturas secretoras. Para isso, observações de campo foram realizadas para investigar os polinizadores e os mecanismos de polinização. Flores frescas foram coletadas e fixadas para os estudos morfo-anatômicos e tratamentos de polinização manual foram feitos para verificar o sistema reprodutivo. Também foi determinada a quantidade de sementes potencialmente viáveis obtidas em cada tratamento e analisadas as fragrâncias. Os estudos de filogenia de Cirrhaea e de evolução dos sistemas de polinização de Stanhopeinae foram realizados a partir do seqüenciamento das regiões trnL-F e matK do DNA de cloroplasto e ITS do DNA nuclear. Os dados obtidos para as espécies de Cirrhaea foram acrescidos aos publicados para os demais gêneros de Stanhopeinae para a elaboração de um estudo sobre a evolução dos sistemas de polinização da subtribo. A filogenia das Stanhopeinae foi comparada com uma hipótese filogenética de abelhas da tribo Euglossini (Apidae) a fim de obter informações sobre a evolução dos sitemas de polinização para a subtribo. Cirrhaea...

Biologia floral, reprodutiva e cariótipos de espécies de Pseudobombax Dugand (Bombacoideae, Malvaceae) do sudeste do Brasil; Floral biology, reproductive and kariotypes of species Pseudobombax Dugand (Bombacoideae, Malvaceae) of southeastern Brazil

João Paulo Sardin Nasario
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 14/02/2014 PT
Relevância na Pesquisa
46.43%
Tradicionalmente incluso na extinta família Bombacaceae, Pseudobombax Dugand pertence à subfamília Bombacoideae, Malvaceae sensu lato. Abrange cerca de 29 espécies, das quais 16 ocorrem em território brasileiro e nove são endêmicas. No Brasil, a maioria das espécies é encontrada no sudeste, planalto central e nordeste. As espécies possuem considerável valor comercial, por serem utilizadas no mundo todo, principalmente na ornamentação e arborização urbana. Estudos sobre o sistema reprodutivo e citogenéticos são raros para o gênero. Com este trabalho, objetivou-se o estudo da biologia floral e reprodutiva, assim como a análise cariotípica de três espécies de Pseudobombax da região sudeste do Brasil. As espécies de Pseudobombax são importantes fontes de pólen e néctar para seus visitantes florais, especialmente por florescerem na estação seca. Algumas diferenças foram observadas entre os períodos de floração e frutificação durante os dois anos de estudo, as quais podem estar relacionadas a diferentes quantidades de chuva antes do início da floração. As flores apresentam antese crepuscular/noturna, com características que se encaixam na síndrome da quiropterofilia. As flores de P. tomentosum são significativamente diferentes das demais espécies (maior comprimento da flor...

Floral biology of Stachytarpheta maximiliani Scham. (Verbenaceae) and its floral visitors

Barbola,Ivana de Freitas; Laroca,Sebastião; Almeida,Maria Christina de; Nascimento,Elynton Alves do
Fonte: Sociedade Brasileira De Entomologia Publicador: Sociedade Brasileira De Entomologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2006 EN
Relevância na Pesquisa
56.46%
This study describes the reproductive system of Stachytarpheta maximiliani (Verbenaceae), including its floral biology, nectar and pollen availability and insect foraging patterns, identifying whose species act as pollinators. It was carried out in a Brazilian Atlantic rain forest site. Observations on the pollination biology of the Verbenaceae S. maximiliani indicate that their flowering period extends from September through May. Anthesis occurs from 5:30 a.m. to 5:00 p.m. and nectar and pollen are available during all the anthesis. Many species of beetles, hemipterans, flies, wasps, bees and butterflies visit their flowers, but bees and butterflies are the most frequent visitors. The flowers are generally small, gathered in dense showy inflorescences. A complex of floral characteristcs, such as violet-blue color of flowers, long floral tubes, without scents, nectar not exposed, high concentration of sugar in nectar (about 32%), allowed identification of floral syndromes (melittophily and psicophily) and function for each visitor. The bees, Bombus morio, B. atratus, Trigonopedia ferruginea, Xylocopa brasilianorum and Apis mellifera and the butterflies Corticea mendica mendica, Corticea sp., Vehilius clavicula, Urbanus simplicius, U. teleus and Heraclides thoas brasiliensis...

Reproductive biology of the herkogamous vine Chiococca alba (L.) Hitchc. (Rubiaceae) in the Atlantic Rain Forest, SE Brazil

Castro,Cibele Cardoso de; Oliveira,Paulo Eugênio Alves Macedo de; Pimentel,Rejane Magalhães de Mendonça
Fonte: Sociedade Botânica de São Paulo Publicador: Sociedade Botânica de São Paulo
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2008 EN
Relevância na Pesquisa
56.33%
The family Rubiaceae comprises a wide spectrum of floral mechanisms and two of them seem to be common in certain groups, e.g., distyly in Rubioidae and styllar pollen in Ixoroidae. These mechanisms include herkogamy, which is interpreted as a strategy that avoids self-pollination. This is the first report on the reproductive biology of Chiococca alba, a species that is widely distributed in America. We studied floral biology and the mating system, which were evaluated through fruit set comparisons after controlled crosses (self- and cross-pollinations and test for apomixis), as well as through the evaluation of pollen tube growth resulting from these controlled crosses. Flowers of C. alba are herkogamous, cream, protandrous and lasted for two days. No measurable nectar was found, despite the presence of a nectary-like structure at the base of the corolla tube. Chiococca alba is a preferentially self-incompatible species, but self-pollination and apomixis also contribute to the natural fruit-set. Its reproductive strategy (herkogamy associated with protandry) is different from that expected for members of Chiococceae tribe (i.e., styllar pollen presentation).

Pollination biology in Jacaranda copaia (Aubl.) D. Don. (Bignoniaceae) at the "Floresta Nacional do Tapajós", Central Amazon, Brazil

Maués,Márcia Motta; Oliveira,Paulo Eugênio A. M. de; Kanashiro,Milton
Fonte: Sociedade Botânica de São Paulo Publicador: Sociedade Botânica de São Paulo
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2008 EN
Relevância na Pesquisa
56.19%
Jacaranda copaia (Aubl.) D. Don is a pioneer tree widespread in the Brazilian Amazon, usually found colonizing forest gaps and altered areas, and the forest fragment edges. This study investigated aspects of the floral biology, breeding system and pollinators of J. copaia trees. Flowering lasts from August to November, during the low rainfall period extending up to four weeks per tree and 3-4 months for the population as a whole, characterizing a cornucopia flowering pattern. The fruit set ends in the beginning of the rainy season, with wind dispersed winged seeds. Fruit set from open pollination was 1.06% (n = 6,932). Hand pollination using self-pollen (n = 2,099) did not set fruits. Cross-pollination resulted in 6.54% fruit set (n = 2,524), representing six times more than the natural pollination rate (1.06%, n = 6,932). Flowers excluded from insect visitation (automatic self-pollination) did not set fruits (n = 5,372). Pollen tube growth down to ovary was detected under fluorescence microcoscopy in cross-pollinated and selfed pistils. The species is an obligate allogamous plant, with late-acting self-incompatibility system. Approximately 40 species of native bees visited the flowers, but the main pollinators were medium-sized solitary bees as Euglossa and Centris species due to the compatibility between their body sizes with the corolla tube...

Entomofauna visitante de Belamcanda chinensis (L.) DC (Iridaceae) durante o período de floração

Vitali,Maria de Jesus; Dutra,João Clovis Stanzani; Machado,Vera Lígia Letízio
Fonte: Sociedade Brasileira de Zoologia Publicador: Sociedade Brasileira de Zoologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/1995 PT
Relevância na Pesquisa
46.42%
A study of the reproductive biology of B. chinensis (L.) DC. (Iridaceae) was realized comprising floral biology and breeding systems. The floral biology studies included analyses of nectar production, occurence of osmophores, corolla pigments, ultraviolet reflexion and absortion patterns, viability of pollen, pollinators and flower visitors. The breeding systems were studied taking into account the results of manual pollinators tests. B. chinensis is self-compatible bul cross-pollination is more frequent. The effective pollinators are Plebeia droryana (Friese, 1906) (45,7%), Trigona spinipes (Fabricius, 1793) (27,3%), Tetragonisca angustula (Latreille, 1811) (9,3%). Others insects visitors are considered nectar and pollen thieves. The flowering begins generally in January and February. The complete reproductive cicle, as here considered, begining with floral bud production ending with development of mature fruits, lasts January to June. Seed dispersion is ornitocoric.

Floral biology and breeding system of Psychotria tenuinervis Muell. Arg. (Rubiaceae) in the Atlantic rain forest, SE Brazil

Virillo,Carolina Bernucci; Ramos,Flavio Nunes; Castro,Cibele Cardoso de; Semir,João
Fonte: Sociedade Botânica do Brasil Publicador: Sociedade Botânica do Brasil
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2007 EN
Relevância na Pesquisa
46.49%
(Floral biology and breeding system oi Psychotria tenuinervis Muell. Arg. (Rubiaceae) in the Atlantic rain forest, SE Brazil). The aim of this study was to investigate pollination biology, floral morphometry, morph ratio and breeding system oiPsychotria tenuinervis in an area of Atlantic rain forest in southeastern Brazil. Pollination biology was studied based on focal observations and the breeding system was determined using controlled crosses; data on flower production and floral morphometry were compared between the two floral morphs. Flower production by the two floral morphs was similar, with flowers being reciprocally herkogamous, diurnal and pollinated at similar frequencies, mainly by medium-sized bees. Corolla length and diameter, as well as anther length, were similar between the floral morphs, whereas stigma lobes were larger in thrums. Psychotria tenuinervis is a preferentially self- and intramorph-incompatible, non-apomitic species, with isoplethic populations. At the study site, P. tenuinervis may be considered as a typical distylous species, with reciprocal herkogamous flowers that favour intermorph pollinations and legitimate matings.

Studies of the floral biology and reproductive system of Brassica napus L.(Cruciferae)

Mussury,Rosilda Mara; Fernandes,Wedson Desidério
Fonte: Instituto de Tecnologia do Paraná - Tecpar Publicador: Instituto de Tecnologia do Paraná - Tecpar
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2000 EN
Relevância na Pesquisa
66.29%
Studies of the floral biology of canola were accomplished with the objective of enlarging the system and reproductive strategies knowledge of its CTC-4 cultivar in Dourados, Centerwest, Brazil. Brassica napus is self pollinated, presenting however, many resources for the allogamy accomplishment, e.g., abundant pollen, nectar and scent production. The smaller anther were responsible for the production of fruit with smaller and less growth seeds, when compared to the autogamy, autopollination and cross pollination tests.

Comparative study of the floral biology and of the response of productivity to insect visitation in two rapeseed cultivars (Brassica napus L.) in Rio Grande do Sul

Blochtein,B; Nunes-Silva,P; Halinski,R; Lopes,LA; Witter,S
Fonte: Instituto Internacional de Ecologia Publicador: Instituto Internacional de Ecologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/11/2014 EN
Relevância na Pesquisa
66.39%
Planning the artificial pollination of agricultural crops requires knowledge of the floral biology and reproductive system of the crop in question. Many studies have shown that rapeseed (Brassica napus Linnaeus) is self-compatible and self-pollinated, but its productivity may be increased by insect visitation. In the present study, the floral biology and the response of productivity to insect visitation of two rapeseed cultivars (Hyola 420 and Hyola 61) were analyzed and compared in three regions of Rio Grande do Sul, Brazil. The rapeseed flowers presented three stages during anthesis, with the time periods varying between the cultivars. Both cultivars are self-compatible, but free visitation of insects increased productivity by 17% in the Hyola 420 cultivar and by approximately 30% in the Hyola 61 cultivar. Therefore, it is concluded that the cultivar Hyola 61 is more dependent on insect pollination than Hyola 420.

Relationship of floral morphology and biology of yellow melon hybrids with the attractiveness of pollinators.

KIILL, L. H. P.; COELHO, M. de S.; SIQUEIRA, K. M. M.; RIBEIRO, M. de F.; COSTA, N. D.; FERNANDES, N. de S.; SILVA, T. A. da
Fonte: Magistra, Cruz das Almas, v. 24, p. 143-149, dez. 2012. Publicador: Magistra, Cruz das Almas, v. 24, p. 143-149, dez. 2012.
Tipo: Artigo em periódico indexado (ALICE)
PT_BR
Relevância na Pesquisa
46.4%
To increase the productivity of melon, new hybrids have been released. The aim of this study was to c ompare the differences in morphology and floral biology of two yellow melon hibrids and these could influence the attractiveness of the pollinators. The study was conducted in June 2010, at Embrapa Semiárido (Petrolina-PE), with hybrids BRS Araguaia and Tropical. To evaluate the morphology and anthesis ten flowers were selected of each floral type: hermaphrodite (H) and male (M). The floral visitors were observed simultaneously in the two hybrids, from 5h00a.m until 6h00p.m, in three non-consecutive days. In the morphology, it was found that the Tropical flowers have diameter of corolla higher in two floral types (M: x = 3.82±0.55cm, H: x = 4.74±0.52cm) compared to BRS Araguaia (M: x = 3.46±0.46cm, H: x = 3.77±0.45cm), although the differences were significant only for the hermaphrodites. The BRS Araguaia flowers presented significantly longer (p<0.05) (M: x = 2.20±0.23cm, H: x = 3.86±0.39cm) that the Tropical (M: x = 0. 96±0.30cm, H: x = 2.60±0.63cm). As for anthesis (05h30a.m.) there was no difference in relation to floral types and hybrids. The bees Apis mellifera, Xylocopa grisescens and species of Halictidae family were observed in the area. The visitation peak was recorded between 10h00a.m. and 11h00a.m. in both hybrids. Comparing the visitation in hermaphrodite flowers and production of fruit/plant...

Porta-enxertos para pereira (Pyrus sp.): implica????es sobre a dorm??ncia, biologia floral e conte??do de carboidratos.; Rootstock for pear (Pyrus sp.): implication on dormancy, floral biology and carbohydrate content.

VERISSIMO, Valtair
Fonte: Universidade Federal de Pelotas; Agronomia; Programa de P??s-Gradua????o em Agronomia; UFPel; BR Publicador: Universidade Federal de Pelotas; Agronomia; Programa de P??s-Gradua????o em Agronomia; UFPel; BR
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
56.58%
Floral bud abortion has been the main limiting factor to the expansion of the pear crop in Brazil. That floral bud abortion has been considered as a complex problem that may be affected by physiological, sanitary, genetic and climatic factors. The rootstock that is the main subject of this study could also be an influencing factor in pear floral abortion, since until the year 2000, only the vigorous rootstocks Pyrus calleryana and Pyrus betulaefolia were used in Brazil. After that year, the pear growers of Santa Catarina and Rio Grande do Sul states started using dwarfing quince rootstocks such as Adams and EMC and the results has been satisfactory. In general these quince rootstocks are more sensitive to water stress during drought periods, since they develop a relatively small root system. However, the influence of these rootstocks on the physiology of dormancy, carbohydrate metabolism and floral biology are not known. With the objective of studying such unknown aspects, five experiments were carried out from 2005 to 2007 growth seasons. Part of these experiments was conduced under field conditions in a commercial orchard in Vacaria, RS, whereas other experiment activities were developed at Embrapa Clima Temperado research center in Pelotas...

The evolutionary biology of pollination: studies in a genus of australian sexually deceptive orchids

Whitehead, Michael Robert
Fonte: Universidade Nacional da Austrália Publicador: Universidade Nacional da Austrália
Tipo: Thesis (PhD); Doctor of Philosophy (PhD)
EN_AU
Relevância na Pesquisa
46.49%
There are few other structures in nature from which evolution has generated such wide diversity as the flower or inflorescence, and this diversity is commonly attributed to the influence of their animal visitors. By outsourcing their mate choice to pollinators, plants have left themselves - and especially their flowers - subject to the selective forces imposed by the behaviour, cognition and perception of the pollinators that serve them. The orchids provide some of the most remarkable and extreme examples of adaptations to specific animal pollinators. Perhaps one of the most peculiar of these strategies is sexual deception, whereby male insects are lured to the flower by mimicry of the female sex pheromone. This seemingly unlikely strategy has evolved multiple times independently on different continents in different parts of the orchid phylogeny which raises the question of what adaptive advantages might underlie such a strategy. This multidisciplinary thesis studies gene flow and pollinator behaviour in two sympatric sexually deceptive orchids in the genus Chiloglottis. The two species attract their specific wasp pollinators through emission of distinct species - specific semiochemicals. Since floral volatiles play a pre-eminent role in pollinator attraction...

Floral biology and behavior of Africanized honeybees Apis mellifera in soybean (Glycine max L. Merril)

Chiari,Wainer César; Toledo,Vagner de Alencar Arnaut de; Ruvolo-Takasusuki,Maria Claudia Colla; Attencia,Valeria Maria; Costa,Fabiana Martins; Kotaka,Carolina Satie; Sakaguti,Eduardo Shiguero; Magalhães,Helida Regina
Fonte: Instituto de Tecnologia do Paraná - Tecpar Publicador: Instituto de Tecnologia do Paraná - Tecpar
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/05/2005 EN
Relevância na Pesquisa
66.39%
This research was carried out to evaluate the pollination by Africanized honeybees Apis mellifera, the floral biology and to observe the hoarding behavior in the soybean flowers (Glycine max Merril), var. BRS-133. The treatments were constituted of demarcated areas for free visitation of insects, covered areas by cages with a honeybee colony (A. mellifera) and also covered areas by cage without insects visitation. All areas had 24 m² (4m x 6m). The soybean flowers stayed open for a larger time (82.82 ± 3.48 hours) in covered area without honeybees. The stigma of the flowers was also more receptive (P=0.0021) in covered area without honeybees (87.3 ± 33.0%) and at 10:42 o'clock was the schedule of greater receptivity. The pollen stayed viable in all treatments, the average was 99.60 ± 0.02%, which did not present differences among treatments. The percentage of abortion of the flowers was 82.91% in covered area without honeybees, this result was superior (P=0.0002) to the 52.66% and 53.95% of the treatments uncovered and covered with honeybees, respectively. Honeybees were responsible for 87.7% of the pollination accomplished by the insects. The medium amounts of total sugar and glucose measured in the nectar of the flowers were...

Nectarios extraflorales de especies de Vigna de la Argentina : morfología, origen, función; Extrafloral nectaries of species of Vigna from Argentina : morphology, origin, function

Ojeda, Fabiana Soledad
Fonte: Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires Publicador: Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires
Tipo: info:eu-repo/semantics/doctoralThesis; tesis doctoral; info:eu-repo/semantics/publishedVersion Formato: application/pdf
Publicado em //2013 SPA
Relevância na Pesquisa
46.4%
Se estudió la biología reproductiva de cuatro especies de Vigna nativas de la Argentina con potencial forrajero y/u ornamental. Vigna adenantha (G. F. W. Meyer) Maréchal Mascherpa & Stainier, Vigna candida (Vell.) Maréchal Mascherpa & Stainier, Vigna caracalla (L.) Verdc. y Vigna luteola (Jacq.) Benth., en poblaciones naturales y en un cultivo en C.A.B.A. Se investigó la ontogenia, morfología y función de los nectarios extraflorales (NEFs) asociados a las inflorescencias, así como la utilidad de éstos para la taxonomía. Además se exploraron otros aspectos reproductivos relacionados con los NEFs plausibles de contribuir a esta disciplina: morfología de semillas y plántulas, longevidad de las plantas, biología floral y sistema reproductivo. Los caracteres que resultaron útiles fueron la morfología de las semillas y de las plántulas, el tipo de germinación, la longevidad de las plantas, los atributos florales, la cantidad de NEFs, su anatomía y citología. Los NEFs se originan de flores abortivas. La secreción e granulocrina. La ontogenia del primer o único NEF funcional es concordante con el desarrollo del polen y del megagametofito de las flores del mismo nudo. Las hormigas que visitaron los NEFs no constituyeron una defensa biológica contra los fitófagos...

Analysis of the variability and correlations of floral biology factors affecting fruit set in apricot in a Mediterranean climate

Ruiz, David; Egea, José
Fonte: Elsevier Publicador: Elsevier
Tipo: Artículo Formato: 259768 bytes; application/pdf
ENG
Relevância na Pesquisa
66.39%
10 pages, 2 figures, 6 tables.-- Available online 17 October 2007.; Floral biology factors which affect fruiting in apricot, such as flower bud production, flower production, flower bud drop, flowering time, percentage pollen germination, height difference between the stigma and the superior plane of the anthers, percentage of aborted pistils, autogamy level, fruit set and fruit production, have been studied for 3 consecutive years in 43 apricot cultivars and selections grown in a Mediterranean climate. An important genetic diversity has been found in the set of evaluated apricot genotypes and significant differences were found among them in all attributes studied. Significant year-by-year variation has been shown for flower bud production, flower bud drop, flowering time, autogamy level, fruit production and fruit set. High correlation existed between some floral biology factors. Flower bud drop and pollen germination were correlated significantly with flowering time. Flower production influenced significantly fruit production, which was highly correlated with fruit set. Significant negative correlation was found between autogamy level and height difference between the stigma and the superior plane of the anthers. Significant negative correlation between percentage of flower bud drop and flower production was observed...

Floral biology and reproductive system of enantiostylous Senna corymbosa (Caesalpiniaceae)

Laporta,Cecilia
Fonte: Revista de Biología Tropical Publicador: Revista de Biología Tropical
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2005 EN
Relevância na Pesquisa
56.23%
The genus Senna (K.Bahuin) Miller (Cassieae) is represented in Argentina by 35 species and several varieties distributed in temperate, tropical and subtropical regions, and presents a high degree of endemism. Some taxa are used for medicine, animal foraging and ornamental purposes. Floral morphology, phases, rewards, attractants, visitors, pollen, reproductive system, P/O ratio, OCI and ISI indexes of enantiostylous Senna corymbosa were analyzed for morphological androecial differentiation and possible related functional differences between stamens groups. The study was carried out over three consecutive flowering seasons in March of 1999, 2000 and 2001, in two populations near the city of Buenos Aires, Argentina. The species has a buzz-pollination syndrome. The pollinators are Bombus atratus that vibrate the stamens, leading to nothotribic or sternotribic deposition of pollen. P/O ratio and pollen production were high thanks to the precise pollinating mechanism that needs a large delivery of pollen to ensure effective pollen deposition. P/O ratio also indicates that the species is xenogamous, although geitonogamy and autogamy (only induced, not spontaneous)were also recorded. The species is self-compatible. There were differences in hand-pollination treatments between long and medium stamens in fruit set...