Apomixis
Mostrando 1-12 de 41 artigos, teses e dissertações.
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1. Special offer while stocks last: high-energy pulse of nectar caused by a massive post-fire flowering of Sinningia elatior (Gesneriaceae) in an area of Cerrado and implications for its pollination
Resumo A intensa floração pós-fogo de Sinningia elatior (Gesneriaceae) foi estudada em uma área de Cerrado. Para estudar o sistema reprodutivo, testes de polinização foram realizados no campo. Espécimes de S. elatior foram encontrados isolados ou agrupados na área de estudo, as flores são tubulares, alaranjadas/avermelhadas e desprovidas de odor. Ap
Rodriguésia. Publicado em: 03/10/2019
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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. Can the reproductive system of a rare and narrowly endemic plant species explain its high genetic diversity?
ABSTRACT The reproductive system of flowering plants can be highly variable, affecting their biology, gene flow and genetic variability among populations. Petunia secreta is a rare annual endemic species of Pedra do Segredo, located in the municipality of Caçapava do Sul, state of Rio Grande do Sul, Brazil. Although rare, the species possesses a high level
Acta Bot. Bras.. Publicado em: 08/01/2018
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4. Marker-assisted screening of breeding populations of an apomictic grass Cenchrus ciliaris L. segregating for the mode of reproduction
Abstract Cenchrus ciliaris L. is an apomictic forage grass grown in pastures and rangelands of the semi-arid tropics. It reproduces predominantly through apomixis; rarely, obligate sexual plants have also been reported. Absence of sexual reproduction limits the possibility of genetic improvement through hybridization. This study reports on hybridization of a
Crop Breed. Appl. Biotechnol.. Publicado em: 2017-03
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5. Flowering traits in tetraploid Brachiaria ruziziensis breeding
Abstract Tetraploid Brachiaria ruziziensis genotypes which reproduce sexually are essential for the breeding of other species of the Brachiaria genus which reproduce by apomixis. Aiming at studying the available phenotypic and genetic variability in the breeding population of B. ruziziensis, it was estimated the parameters heritability and genetic and phenot
Crop Breed. Appl. Biotechnol.. Publicado em: 2016-06
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6. Sequence characterization, in silico mapping and cytosine methylation analysis of markers linked to apospory in Paspalum notatum
In previous studies we reported the identification of several AFLP, RAPD and RFLP molecular markers linked to apospory in Paspalum notatum. The objective of this work was to sequence these markers, obtain their flanking regions by chromosome walking and perform an in silico mapping analysis in rice and maize. The methylation status of two apospory-related se
Genet. Mol. Biol.. Publicado em: 09/11/2012
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7. Identification of a molecular marker linked to apomixis in Brachiaria humidicola (Poaceae)
A bulked segregant analysis using RAPD technique was carried out to identify molecular markers linked to apomixis in a Brachiaria humidicola F1 population that segregated 1 : 1 for the mode of reproduction (apomixis and sexual). A marker related to the apo-locus was found. Segregation data, together with this marker were used to generate a map of the region.
Plant Breeding. Publicado em: 2011
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8. Apomixia em Manihot esculenta e em seus hibridos interespecificos.
O objetivo deste trabalho foi estudar a citogenética e a morfologia do saco embrionário dos clones EB1 (Manihot esculenta Crantz) e EB12 (gera-ção F3 de M. esculenta x M. glaziovii Muell), dos híbridos F1 e F2 de M. neusana Nassar x M. esculenta e da espécie silvestre M. neusana, para verificar o fenômeno da apomixia. Os óvulos foram analisados pelo
Pesquisa Agropecuaria Brasileira. Publicado em: 2011
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9. Desenvolvimento de cultivares do gênero Brachiaria (trin.) Griseb no Brasil.
In Brazil, cultivated pastures cover more than 100 million hectares and Brachiaria species cover more than 45 million hectares. B. brizantha cv. Marandu and B. decumbens cv. Basilisk are the primary cultivars. The large areas occupied by the same cultivars pose a vulnerability to the beef cattle activity, and make clear how necessary is to increase the genet
Planaltina. Publicado em: 2011
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10. Biometrical analysis and selection of tetraploid progenies of Panicum maximum using mixed model methods.
The objectives of this work were to estimate the genetic and phenotypic parameters and to predict the genetic and genotypic values of the selection candidates obtained from intraspecific crosses in Panicum maximum as well as the performance of the hybrid progeny of the existing and projected crosses. Seventy-nine intraspecific hybrids obtained from artificia
Pesquisa Agropecuária Brasileira. Publicado em: 2011
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11. Biologia reprodutiva de espécies de Bignoniaceae ocorrentes no Cerrado e variações no sistema de autoincompatibilidade
Bignoniaceae present mainly self-incompatibility system and diploid chromosome number, although some self-fertile, apomictic and polyploid species have been reported. The Cerrado flora seems to concentrate a high number of polyploid angiosperm species and the herbaceous-shrub layer presents species predominantly self-fertile, which contrasts with the mostly
Publicado em: 2010
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12. Cytogenetic data for Paspalum notatum Flügge accessions / Dados citogenéticos para acessos de Paspalum notatum Flügge
Muitas espécies do genus Paspalum L. são importantes forragens, devido à qualidade, produtividade e tolerância para o stress ambiental. Números cromossômicos, configurações meióticas e fertilidade do pólen foram analisados em uma coleção de 85 acessos de Paspalum notatum Flügge e sete acessos de Pensacola (P. notatum var saurae). Todos os acesso
Publicado em: 2010