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	Provedor de dados Biota Neotropica (1) PAB (1) Autor Carvalho,Isabelle Vilela de (1) Davide,Lisete Chamma (1) Ferreira,Kátia (1) Pagliarini,Maria Suely (1) Risso-Pascotto,Claudiceia (1) Torres,Giovana Augusta (1) Valle,Cacilda Borges do (1) Mais... Palavra-chave Cytomixis (2) Meiosis (2) Brachiaria dura (1) Chromosome number (1) Crotalaria (1) Cytogenetics (1) Pollen grain viability (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2009 (2) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Abnormal meiotic behavior in three species of Crotalaria PAB Ferreira,Kátia; Torres,Giovana Augusta; Carvalho,Isabelle Vilela de; Davide,Lisete Chamma. The objective of this work was to compare the meiotic behavior and pollen grain viability of three species of Crotalaria. Slides for meiotic analysis were prepared by the air-drying technique. Pollen grain viability was measured by three staining procedures (Alexander's solution, tetrazolium chloride and fluorescein diacetate) and in vitro germination in a sucrose solution. Eight bivalents were observed, confirming previous reports on populations from other regions of Brazil, as well as from other countries. All species showed abnormal meiotic behavior as follows: in Crotalaria micans, cytomixis and abnormal chromosome pairing in diakinesis; in C. spectabilis, abnormal chromosome pairing in diplotene; in C. zanzibarica, shrunk nuclei in leptotene and... Tipo: Info:eu-repo/semantics/article Palavras-chave: Crotalaria; Cytogenetics; Cytomixis; Meiosis; Pollen grain viability. Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009001200012 Chromosome number and microsporogenesis of two accessions of Brachiaria dura Stapf (Poaceae) Biota Neotropica Risso-Pascotto,Claudiceia; Pagliarini,Maria Suely; Valle,Cacilda Borges do. The two accessions of B. dura analyzed (DU01 and DU02) are hexaploid (2n = 6x = 54), derived from x = 9. Meiotic abnormalities, such as precocious chromosome migration to the poles, laggards and micronuclei, were recorded in low frequency in both accessions. The few multivalent chromosome association at diakinesis and meiotic stability suggested that hexaploidy probably resulted from chromosome doubling. In DU02, chromosome transfer (cytomixis) among meiocytes, involving part or the entire genome was observed. The implication of these findings for the Brachiaria breeding is discussed. Tipo: Info:eu-repo/semantics/article Palavras-chave: Brachiaria dura; Meiosis; Chromosome number; Cytomixis. Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032009000200024 Registros recuperados: 2 Primeira ... 1 ... Última

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