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	Provedor de dados 3 (1) 52 (1) Autor Benites, Flavio Rodrigo Gandolfi; Empresa Brasileira de Pesquisa Agropecuária (1) Costa,Fabiane Rabelo da (1) Damasceno Junior,Pedro Correa (1) Freitas,Noil Gomes de (1) Paula, Cristina Maria Pinto de; Universidade Federal de Lavras (1) Pereira,Messias Gonzaga (1) Pereira,Telma Nair Santana (1) Ribeiro,Beatriz Ferreira (1) Santos,Lídia Márcia Silva (1) Sobrinho, Fausto de Souza; Empresa Brasileira de Pesquisa Agropecuária (1) Souza,Margarete Magalhães de (1) Techio, Vânia Helena; Universidade Federal de Lavras (1) Mais... Palavra-chave Pollen grain (2) 2.02.00.00-5 Fertility (1) Carica papaya (1) Forage breeding (1) Forage grass (1) Microgametogenesis (1) Microsporogenesis (1) Ultrastructure (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2014 (1) 2008 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Intra-inflorescence pollen viability in accessions of Brachiaria ruziziensis 3 Paula, Cristina Maria Pinto de; Universidade Federal de Lavras; Techio, Vânia Helena; Universidade Federal de Lavras; Benites, Flavio Rodrigo Gandolfi; Empresa Brasileira de Pesquisa Agropecuária; Sobrinho, Fausto de Souza; Empresa Brasileira de Pesquisa Agropecuária. Knowledge about the pollen viability is important to ensure success in controlled hybridizations and, consequently, support breeding programs. The aims of this study were to evaluate the pollen viability in progenies of artificially induced tetraploid accessions of Brachiaria ruziziensis, and to verify if the position of the flower buds on the raceme affects the pollen viability rate. Staining of aborted and non-aborted pollen (Alexander’s technique) was used to determine the viability of the pollen grains. Tetraploid accessions of B. ruziziensis plants had high pollen viability (x = 76.8% to x = 99.6%). Some of these plants had viability rates similar to diploid B. ruziziensis, showing that the induction of chromosome duplication by colchicine did not... Tipo: Info:eu-repo/semantics/article Palavras-chave: 2.02.00.00-5 Fertility; Pollen grain; Forage breeding; Forage grass. Ano: 2014 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/19440 Optical and ultrastructural study of the pollen grain development in hermaphrodite papaya tree (Carica papaya L.) 52 Santos,Lídia Márcia Silva; Pereira,Telma Nair Santana; Souza,Margarete Magalhães de; Damasceno Junior,Pedro Correa; Costa,Fabiane Rabelo da; Ribeiro,Beatriz Ferreira; Freitas,Noil Gomes de; Pereira,Messias Gonzaga. The objective of this study was to describe the pollen grain development in hermaphrodite papaya tree. The flower buds were collected at different stages of the development and the anthers were treated chemically for observation under optical and electronic transmission microscopes. The pollen grain development followed the normal pattern described for the Angiosperms. The pollen grain development was described from meiocyte to the mature pollen grain. In the microsporogenesis, the microspore mother cells or the meiocytes underwent meiosis giving rise to the tetrads that were enclosed by the calose. Later, the tetrads were released by the dissolution of the calose by calase activity and microspores underwent mitosis. Microgametogenesis was characterized by... Tipo: Info:eu-repo/semantics/article Palavras-chave: Carica papaya; Microsporogenesis; Microgametogenesis; Pollen grain; Ultrastructure. Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000300013 Registros recuperados: 2 Primeira ... 1 ... Última

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