Floral Ontogeny
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Corona development and floral nectaries of Asclepiadeae (Asclepiadoideae, Apocynaceae)
ABSTRACT Flowers of Asclepiadoideae are notable for possessing numerous nectaries and elaborate coronas, where nectar can accumulate but is not necessarily produced. Given the complexity and importance of these structures for reproduction, this study aimed to analyze the ontogeny of the corona, the structure and position of nectaries and the histochemistry o
Acta Bot. Bras.. Publicado em: 2017-09
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2. Development of carpels and ovules in Dialypetalanthus fuscescens Kuhlm. (Rubiaceae): an enigmatic taxon
ABSTRACT Dialypetalanthus is a monospecific genus that occurs in the Amazon Basin of Brazil, Bolivia and Peru and occupies a controversial position among the Rubiaceae. We continue this taxonomic discussion with the overall aim of clarifying the systematic position of D. fuscescens within the Rubiaceae. To accomplish this, we analyzed the ontogeny of its gyn
Acta Bot. Bras.. Publicado em: 2017-03
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3. Desenvolvimento e morfologia da flor em espécies da tribo Dipterygeae (Leguminosae, Papilionoideae) / Floral development and morphology in species of Dipterygeae (Papilionoideae - Leguminosae)
Espécies da tribo Dipterygeae apresentam morfologia floral interessante, em especial o cálice, bem diferente dos demais membros de Papilionoideae. Representantes desta tribo exibem cálice assimétrico, constituído por duas sépalas adaxiais muito grandes e livres, e três sépalas unidas na base, com lobos abaxiais em forma de pequenos dentes. Assim, est
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/07/2012
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4. Desenvolvimento floral e expressão sexual em espécies de Ficus L. (Moraceae) / Floral development and sex expression in species of Ficus L. (Moraceae)
The absence of reproductive organs in some flowers may ontogenetically arise by organ loss or suppression. Ficus L. is an interesting model for floral developmental studies, due to its diversity in sexual systems. The aim of this study was to compare the morphology of the floral development in Ficus citrifolia (monoecious), F. hispida (gynodioecious), F. rac
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/02/2011
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5. Structure and ontogeny of the pericarp of six Eupatorieae (Asteraceae) with ecological and taxonomic considerations
A ontogênese das cipselas e de suas partes acessórias em Campuloclinium macrocephalum, Chromolaena stachyophylla, Mikania micrantha, Praxelis pauciflora, Symphyopappus reticulatus e Vittetia orbiculata, parte delas segregadas do gênero Eupatorium, foi estudada em microscopia de luz e eletrônica de varredura. A camada de fitomelanina presente no fruto apa
Anais da Academia Brasileira de Ciências. Publicado em: 2010-06
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6. Embriologia de Miconia albicans (Sw.) Triana (Melastomataceae), especie agamospermica / Embriology of Miconia albicans (Sw.) (Melastomataceae), agamospermous species
Miconia albicans (Melastomataceae) is a species with diplosporic obligate agamospermy and no pollen viability in ?Cerrado? and Atlantic Forest vegetations. The sterility of pollen grains wasn?t restricted to one developmental stage and the major abnormality of the cells from pre-anthesis flower anthers was the deformation of the reproductive cell wall, mainl
Publicado em: 2007
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7. Ontogenese floral com enfase no estudo do gineceu em Apocynaceae s.l / Floral ontogenesis with emphasis in the study of gynoecium in Apocynaceae s.l
Apocynaceae s.l. é uma das maiores famílias de angiospermas com 4300-4800 espécies, está bem representada nos biomas brasileiros e possui expressiva importância fitoquímica, entre outros aspectos. Os sistemas de classificação da família têm refletido lacunas no conhecimento de sua morfologia, particularmente quanto a caracteres relativos ao gineceu
Publicado em: 2006
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8. Desenvolvimento floral de Caesalpinia echinata LAM, Caesalpinia peltophoroides Benth e Caesalpinia férrea Var. leyotachia Benth. (Fabaceae/Caesalpinioideae). / Floral development in Caesalpinia echinata LAM, Caesalpinia peltophoroides benth e Caesalpinia ferrea benth var. leyotachia (fabaceae/ caesalpinioideae).
O estudo da ontogênese floral é essencial para uma melhor compreensão dos processos evolutivos envolvidos no desenvolvimento dos órgãos reprodutivos dos vegetais. Este trabalho teve por objetivo analisar a ontogênese floral das espécies C. echinata, C. peltophoroides e C. ferrea, da família Fabaceae/ Caesalpinioideae Foram realizados estudos morfo-an
Publicado em: 2004
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9. O genero Dahlstedtia Malme : embriologia, sistema reprodutivo e biossistematica
Flowers, fruits and seed abortion was studied in two Brazilian species: Dahlstedtia pinnata e D. pentaphy/la (Leguminosae, Papilionoideae). Such a study was developed through investigations of: 1. floral development, microsporogenesis, ovule and early seed development following open, self- and cross-pollination, in order to compare the results to other papil
Publicado em: 2001
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10. AP2 Gene Determines the Identity of Perianth Organs in Flowers of Arabidopsis thaliana.
We have examined the floral morphology and ontogeny of three mutants of Arabidopsis thaliana, Ap2-5, Ap2-6, and Ap2-7, that exhibit homeotic changes of the perianth organs because of single recessive mutations in the AP2 gene. Homeotic conversions observed are: sepals to carpels in all three mutants, petals to stamens in Ap2-5, and petals to carpels in Ap2-6
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11. Functional Conservation of PISTILLATA Activity in a Pea Homolog Lacking the PI Motif1
Current understanding of floral development is mainly based on what we know from Arabidopsis (Arabidopsis thaliana) and Antirrhinum majus. However, we can learn more by comparing developmental mechanisms that may explain morphological differences between species. A good example comes from the analysis of genes controlling flower development in pea (Pisum sat
American Society of Plant Biologists.
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12. The FLO10 Gene Product Regulates the Expression Domain of Homeotic Genes AP3 and PI in Arabidopsis Flowers.
We describe a novel mutant of Arabidopsis, Flo10, which is the result of a recessive allele, flo10, in the nuclear gene FLO10. The first three organ whorls (sepals, petals, and stamens) of Flo10 flowers are normal, but the fourth, gynoecial whorl is replaced by two to eight stamens or stamen-carpel intermediate organs. Studies of ontogeny suggest that the po