Data/hora: 24/06/2024 20:46:14

Biblioteca(s): 	Embrapa Gado de Corte.	
Data corrente: 	04/01/2005	
Data da última atualização: 	31/08/2007	
Autoria: 	RISSO-PASCOTTO, C.; PAGLIARINI, M. S.; VALLE, C. B. do; JANK, L.	
Título: 	Asynchronous meiosis in an interspecific hybrid of Brachiaria ruziziensis and B. brizantha.	
Ano de publicação: 	2004	
Fonte/Imprenta: 	Plant Cell Reports, Berlin, v. 23, n. 5, p. 304 - 310, Nov. 2004.	
Idioma: 	Inglês	
Notas: 	CNPGC.	
Conteúdo: 	Male meiosis is generally synchronous in higher plants. The regulation of the cell cycle is still not well understood, and a powerful tool for gaining an understanding of this regulation is the development of mutations that affect cell-cycle synchrony. We report here asynchronous microsporogenesis in an interspecific hybrid between two important tropical grasses. In young spikelets of the interspecific hybrid 49.10% of anther meiocytes entered meiosis, exhibiting typical phases of the first and second divisions, while the other 50.90% showed distinctive features of early prophase. In older spikelets, anthers containing mature pollen grains also displayed meiocytes still undergoing meiosis. At this time, the latter cells were enclosed by the exine wall. Despite asynchrony, all cells completed meiosis. Old anthers contained only pollen grains that appeared to be in the same stage of development. Pollen fertility was estimated to be 52.76% in dehiscent anthers. An independent genetic control for meiosis synchrony and meiotic stages is suggested.	
Palavras-Chave: 	Cytology.	
Thesagro: 	Brachiaria Brizantha; Brachiaria Ruziziensis; Citologia; Hibridação; Meiose; Melhoramento Genético Vegetal.	
Thesaurus Nal: 	interspecific hybridization; meiosis; plant breeding.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Gado de Corte (CNPGC)	
Exemplares: 	CNPGC - (10759-1) - UPC - SP - -- - 449/01 -  - 449/01 - DIS