Data/hora: 08/06/2024 19:19:22

Biblioteca(s): 	Embrapa Pecuária Sudeste; Embrapa Recursos Genéticos e Biotecnologia.	
Data corrente: 	02/04/2014	
Data da última atualização: 	13/03/2023	
Autoria: 	BERNARDO FILHO, R. A.; SANTOS, A. C. C.; SOUZA, F. H. D. de; VALLS, J. F. M.; PAGLIARINI, M. S.	
Afiliação: 	FRANCISCO HUMBERTO DUBBERN DE SOUZA, CPPSE; JOSE FRANCISCO MONTENEGRO VALLS, CENARGEN.	
Título: 	Complete asynapsis resulting in 2n pollen formation in Paspalum jesuiticum Parodi (Poaceae).	
Ano de publicação: 	2014	
Fonte/Imprenta: 	Genetics and Molecular Research, v. 13, n. 1, p. 255-261, 2014.	
ISBN: 	1676-5680	
Idioma: 	Inglês
Português	
Conteúdo: 	Cytological investigation revealed complete asynapsis during microsporogenesis in 2 wild accessions of Paspalum jesuiticum collected in distinct Brazilian regions. Both accessions were hexaploid (2n = 6x = 60) and 60 univalents could be counted at diakinesis. In this phase, the majority of meiocytes exhibited univalents with both chromatids. After alignment at the metaphase plate, the chromatids segregated to the poles. Only 1 meiotic division (equational) occurred, and after cytokinesis, a dyad with 2n microspores was formed. The genetic constitution of the 2n gametes was equivalent to that of first division restitution (FDR). Since recombination did not occur, 100% transmission of parental heterozygosity could be expected from the FDR 2n gametes. The meiotic behavior of both accessions suggested that they resulted from a recent natural hybridization event. The potential use of the 2n gametes in Paspalum breeding programs has been discussed.	
Thesaurus Nal: 	hexaploidy; interspecific hybridization; meiosis; Poaceae; polyploidy.	
Categoria do assunto: 	F Plantas e Produtos de Origem Vegetal	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/180009/1/gmr2770.pdf
http://ainfo.cnptia.embrapa.br/digital/bitstream/item/100921/1/PROCI-2014.00009.pdf	
Registro original: 	Embrapa Recursos Genéticos e Biotecnologia (CENARGEN)	
Exemplares: 	CPPSE - (22452-1) - UPC - AP - DD - PROCI-2014.00009 - BER - 2014.00009 - DIS
CENARGEN - (35109-1) - UPC - AP - DD - SP 20594 -  - SP 20594 - DIS