Home Itens selecionados Provedores de dados OAI Créditos Sobre Ajuda

			Busca avançada
	Provedor de dados 63 (2) 52 (1) 74 (1) Autor Pagliarini,Maria Suely (2) Adamowski,Eleniza de Victor (1) Batista,Luiz Alberto Rocha (1) Castro,Biane de (1) Dahmer,Nair (1) Dall'Agnol,Miguel (1) Federizzi,Luiz Carlos (1) Guerra,Divanilde (1) Mendes-Bonato,Andréa Beatriz (1) Pacheco,Marcelo Teixeira (1) Risso-Pascotto,Claudicéia (1) Schifino-Wittmann,Maria Teresa (1) Valle,Cacilda Borges do (1) Mais... Palavra-chave Pollen fertility (4) Meiotic behavior (2) Apomixis (1) Brachiaria jubata (1) Cell fusion (1) Chromosome number (1) Chromosome numbers (1) Male sterility (1) Meiotic configurations (1) Microsporogenesis (1) Paspalum maritimum (1) Plant breeding (1) Productivity (1) Mais... Tipo do documento Info:eu-repo/semantics/article (4) Ano 2013 (1) 2008 (1) 2003 (1) 2000 (1) País Brazil (4) Idioma Inglês (4)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 4 Primeira ... 1 ... Última Chromosome number and microsporogenesis in Paspalum maritimum (caespitosa group; gramineae) 52 Adamowski,Eleniza de Victor; Pagliarini,Maria Suely; Batista,Luiz Alberto Rocha. Despite of economic importance of the genus Paspalum, little or no cytologic information is available for many species. This is the first report about chromosome number and meiotic behavior for P. maritimum. The three accessions collected in Amapá State (North Region of Brazil) were tetraploid (2n=4x=40) with the chromosomes associating predominantly as bivalents. The low frequency of multivalents suggested that they were segmental allotetraploids. All accessions showed a low rate of meiotic irregularities, and as a consequence the pollen fertility was high. The results suggested that these accessions presented potential for use in a hybridization program. Tipo: Info:eu-repo/semantics/article Palavras-chave: Paspalum maritimum; Chromosome number; Meiotic behavior; Pollen fertility. Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000300009 Normal microspore production after cell fusion in Brachiaria jubata (Gramineae) 74 Mendes-Bonato,Andréa Beatriz; Risso-Pascotto,Claudicéia; Pagliarini,Maria Suely; Valle,Cacilda Borges do. Cytogenetic studies were carried out on 22 accessions of Brachiaria jubata from the Embrapa Beef Cattle Brachiaria collection. One accession was diploid (2n = 2x = 18) and the remaining 21 were tetraploid (2n = 4x = 36). Among five tetraploid accessions, a specific and constant pattern of cell fusion involving only two microsporocytes was recorded. Meiosis proceeded normally from prophase I to the end, giving rise to an octad with normal microspores that developed into fertile pollen grains. Regular octad formation was possible because each cellular chromosome set was maintained in its proper domain, spindles were correctly positioned, and cytokinesis planes were formed in the correct places. Such behavior of meiosis in syncytes has never been reported in... Tipo: Info:eu-repo/semantics/article Palavras-chave: Brachiaria jubata; Cell fusion; Microsporogenesis; Pollen fertility. Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000400016 Phenotypic, cytogenetic and spike fertility characterization of a population of male-sterile triticale 63 Guerra,Divanilde; Pacheco,Marcelo Teixeira; Federizzi,Luiz Carlos. Triticale (X Triticosecale Wittmack) is a good cereal for production of flour and feed. A segregating population of triticale was developed from a male-sterile (MS) plant. To determine whether this new source of male sterility in triticale is appropriate for use in breeding programs the expression of the male sterility phenotype was characterized through spike fertility, meiotic behavior, and pollen. Controlled crosses between male-sterile plants and control varieties male-fertile (MF) of triticale were also conducted, and cytological analyses were performed in the F2 and backcross plants. Plants with male-sterile phenotypes displayed reduced spike fertility when compared to plants with male-fertile phenotypes. Compared to male-fertile plants, male-sterile... Tipo: Info:eu-repo/semantics/article Palavras-chave: Male sterility; Meiotic behavior; Pollen fertility; Productivity. Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000100007 Cytogenetic data for Paspalum notatum Flügge accessions 63 Dahmer,Nair; Schifino-Wittmann,Maria Teresa; Dall'Agnol,Miguel; Castro,Biane de. Several species of the genus Paspalum L. are important forages, due their to quality, productivity and tolerance to environmental stresses. Chromosome numbers, meiotic configurations and pollen fertility were evaluated in a collection of 85 accessions of Paspalum notatum Flügge and in seven accessions of Pensacola (P. notatum var saurae). All P. notatum accessions were tetraploid, with 2n = 4x = 40, except one diploid accession, considered as an escape of Pensacola. All Pensacola plants had 2n = 2x = 20. Meiotic configurations at diakinesis and metaphase I varied among tetraploid accessions, from plants with only bivalents to plants with high frequency of quadrivalents. Pollen fertility varied from 82.5 to 95.9% among diploid accessions and from 72.4 to... Tipo: Info:eu-repo/semantics/article Palavras-chave: Apomixis; Chromosome numbers; Meiotic configurations; Plant breeding; Pollen fertility. Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000400009 Registros recuperados: 4 Primeira ... 1 ... Última

Empresa Brasileira de Pesquisa Agropecuária - Embrapa Todos os direitos reservados, conforme Lei n° 9.610 Política de Privacidade Área restrita		Embrapa Parque Estação Biológica - PqEB s/n° Brasília, DF - Brasil - CEP 70770-901 Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco