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	Provedor de dados Acta Botanica (1) BABT (1) BJMBR (1) Autor Costa,Fabiane Rabelo da (1) Damasceno Junior,Pedro Correa (1) Dorneles,Mariane Paludette (1) Freitas,Cesar Carvalho de (1) Freitas,Noil Gomes de (1) Jank,L. (1) Martins,Merielem Saldanha (1) Oliveira,João Marcelo Santos de (1) Pagliarini,M.S. (1) Pereira,Messias Gonzaga (1) Pereira,Telma Nair Santana (1) Ribeiro,Beatriz Ferreira (1) Risso-Pascotto,C. (1) Santos,Lídia Márcia Silva (1) Souza,Margarete Magalhães de (1) Valle,C.B. (1) Mais... Palavra-chave Microgametogenesis (3) Microsporogenesis (2) Brachiaria jubata (1) Carbohydrates (1) Carica papaya (1) Development (1) Male sterility (1) Pollen grain (1) Pollen mitosis (1) Sperm cell (1) Sporangium (1) Ultrastructure (1) Mais... Tipo do documento Info:eu-repo/semantics/article (3) Ano 2015 (1) 2008 (1) 2005 (1) País Brazil (3) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Starch distribution in anthers, microspores and pollen grains in Aechmea recurvata (Klotzsch.) L.B.Sm., Dyckia racinae L.B.Sm. and Tillandsia aeranthos (Loisel.) L.B.Sm. (Bromeliaceae) Acta Botanica Oliveira,João Marcelo Santos de; Martins,Merielem Saldanha; Dorneles,Mariane Paludette; Freitas,Cesar Carvalho de. This paper presents a comparative description of the starch distribution in the anthers, microspores and pollen grains of Aechmea recurvata, Dyckia racinae and Tillandsia aeranthos. Flowers at different stages of development were processed according to plant microtechniques for observation by light microscope. Ten stages of embryological development were used as references for the comparative analysis of starch distribution and dynamics. The structural data showed a greater starch accumulation in the parietal layers and connective of D. racinae. It was observed that in the species studied, starch began to accumulate in microspore mother cell stage. The pollen grains in D. racinae and in T. aeranthos present two amylogenesis-amylolysis cycles, while A.... Tipo: Info:eu-repo/semantics/article Palavras-chave: Carbohydrates; Development; Microgametogenesis; Microsporogenesis; Sporangium. Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000100103 Optical and ultrastructural study of the pollen grain development in hermaphrodite papaya tree (Carica papaya L.) BABT 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 Symmetric pollen mitosis I and suppression of pollen mitosis II prevent pollen development in Brachiaria jubata (Gramineae) BJMBR Risso-Pascotto,C.; Pagliarini,M.S.; Valle,C.B.; Jank,L.. Microsporogenesis and pollen development were analyzed in a tetraploid (2n = 4x = 36) accession of the forage grass Brachiaria jubata (BRA 007820) from the Embrapa Beef Cattle Brachiaria collection that showed partial male sterility. Microsporocytes and pollen grains were prepared by squashing and staining with 0.5% propionic carmine. The meiotic process was typical of polyploids, with precocious chromosome migration to the poles and laggards in both meiosis I and II, resulting in tetrads with micronuclei in some microspores. After callose dissolution, microspores were released into the anther locule and appeared to be normal. Although each microspore initiated its differentiation into a pollen grain, in 11.1% of them nucleus polarization was not observed,... Tipo: Info:eu-repo/semantics/article Palavras-chave: Brachiaria jubata; Male sterility; Microgametogenesis; Pollen mitosis; Sperm cell. Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005001100006 Registros recuperados: 3 Primeira ... 1 ... Última

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