Ovule
Mostrando 1-12 de 103 artigos, teses e dissertações.
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1. Caracteres importantes na identificação de espécies de Ludwigia (Onagraceae) ocorrentes no Recôncavo da Bahia, Brasil
Resumo Na flora aquática do Brasil, o gênero Ludwigia apresenta ca. 48 espécies. A maioria das espécies de Ludwigia é anfíbia, apresentando uma grande plasticidade fenotípica, o que torna sua identificação complexa. O objetivo deste trabalho foi realizar um levantamento taxonômico e analisar caracteres diagnósticos na delimitação das espécies d
Rodriguésia. Publicado em: 20/12/2019
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2. Post pollination events in a self-sterile hexaploid monoembryonic lineage of Handroanthus serratifolius (Vahl) S. Grose (Bignoniaceae)
ABSTRACT In diploid late-acting self-incompatible (LSI) species of Bignoniaceae, self-pollinated pistils show a marked delay in ovule penetration by pollen tubes, followed by delayed, but otherwise normal, initial stages of endosperm development and subsequent pistil abscission. Most polyploid species of Bignoniaceae are apomictic and set selfed fruits with
Acta Bot. Bras.. Publicado em: 12/09/2019
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3. ‘URS Campestre’ seedless orange: a new mutant with female sterility
ABSTRACT: Seedlessness in fruit is a trait that is much sought after by juice making industries. Close to the city of São Sebastião do Caí, in the state of Rio Grande do Sul (RS), Brazil, a new mutant orange originating from natural mutation was identified and selected as a seedless material. To determine the mechanisms involved in the absence of seeds, t
Sci. agric. (Piracicaba, Braz.). Publicado em: 2017-10
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4. 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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5. Embryology of Ageratum conyzoides L. and A. fastigiatum R.M. King & H. Rob. (Asteraceae)
Ageratum has a complex circumscription, and recent studies have indicated its polyphyletism. The genus has been placed in the tribe Eupatorieae whose embryology is not fully known. Embryological data are conservative and important indicators of phylogenetic relationships and can improve family relationships. This study presents, for the first time in Eupato
Acta Bot. Bras.. Publicado em: 2015-03
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6. Pollen-ovule relation in Adesmia tristis and reflections on the seed–ovule ratio by interaction with pollinators in two vertical strata
A distribuição vertical dos polinizadores é um importante componente no padrão de forrageamento nos estratos das plantas e influencia o sistema reprodutivo (relação pólen/óvulo) e a razão semente/óvulo. Nichos em dois estratos diferentes de Adesmia tristis Vogel foram avaliados quanto a esses aspectos. Essa planta é um arbusto endêmico dos campos
An. Acad. Bras. Ciênc.. Publicado em: 09/09/2014
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7. Effects of ovule and seed abortion on brood size and fruit costs in the leguminous shrub Caesalpinia gilliesii (Wall. ex Hook.) D. Dietr
For several plant species, brood size results from the abortion of ovules and seeds. However, these processes have rarely been studied together in wild plants. In some of the leguminous species studied, seed abortion has been found to depend on pollen quality and on the position of the ovule or fruit. The direct consequence for the mother plant is that fruit
Acta Bot. Bras.. Publicado em: 2014-03
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8. Self-sterility in the hexaploid Handroanthus serratifolius (Bignoniaceae), the national flower of Brazil
Polyploidization is common among angiosperms and might induce typically allogamous plants to become autogamous (self-compatible, relying on sexual self-fertilization) or apomictic (achieving asexual reproduction through seeds). This work aimed to determine whether neopolyploidy leads to the breakdown of the self-incompatibility system in the hexaploid non-ap
Acta Bot. Bras.. Publicado em: 2013-12
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9. Improving reproductive efficiency of chickpea by foliar application of zinc
Zinc deficiency is not only the cause of low productivity of crops, but it also results in low zinc content in seeds, which leads to poor dietary zinc intake. To study the effect of zinc foliar application on improving plant yield and seed zinc content for human consumption, chickpea plants were raised in refined sand culture with deficient (0.2 µM) and suf
Braz. J. Plant Physiol.. Publicado em: 2012-09
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10. Metodo de obtencao de hibridos interespecificos entre Lycopersicon esculentum e L. peruvianum.
A transferência de genes da espécie silvestre Lycopersicon peruvianum para a espécie L. esculentum por processo convencional de hibridação é limitada por incompatibilidade. O objetivo deste trabalho foi desenvolver um método de obtenção de híbridos entre essas duas espécies, mediante a técnica de cultura de óvulos, tendo em vista o interesse em
Pesquisa Agropecuaria Brasileira. Publicado em: 2011
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11. Ciclo de vida, estrutura foliar e variações morfoanatômicas influenciadas por diferenças ambientais para Victoria amazonica (POEPP.) J.C. Sowerby (Nymphaeaceae) na Amazônia Central
The Amazon floodplains are specific ecosystems with high biodiversity and endemism, divided in varzeas, white fertile waters, and Igapos with poor and acid waters, black or clear, and mixed waters between the two typologies. This study aimed to characterize morphologically and anatomically leaf structure, germination and life cycle of Victoria amazonica (Poe
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/10/2010
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12. Impacto e fatores determinantes de pragas em Phaseolus vulgaris / Impact and determinants factors of pests attack in Phaseolus vulgaris
The aim of this work were to determine the critical yield components and key factors of yield losses on common bean (Phaseolus vulgaris) and identify the factors that determine pest attack in this culture. The bean crops was cultivated in three growing seasons, the spring-summer, summer-autumn and winter-spring arranged in two planting system, no-tillage and
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/02/2010