Data/hora: 11/06/2024 11:59:47

Biblioteca(s): 	Embrapa Arroz e Feijão.	
Data corrente: 	18/08/2005	
Data da última atualização: 	06/10/2005	
Autoria: 	SIMIONI, C.; WITTMANN, M. T. S.; DALL' AGNOL, M.; GUERRA, D.	
Título: 	Selection for increasing 2n gamete production in red clover.	
Ano de publicação: 	2004	
Fonte/Imprenta: 	Crop Breeding and Applied Biotechnology, Viçosa, MG, v. 4, n. 4, p. 477-483, Dec. 2004.	
Idioma: 	Inglês	
Conteúdo: 	Three selection cycles were performed in the red clover cultivars Quiniqueli, Redland and Keenland to increase the 2n gamete production. Unreduced gamete production was estimated by the giant pollen grain (GP) production. Plants with >1% GP were selected as progenitors from the original population. Plants with at least 2 and 3% GP were selected and crossed for the second and third cycles, respectively. The GP production ranged from 1.4 to 7.5% in the first, 2.0 to 51.0% in the second, and 3.0 to 46.7% in the third cycle. Considering the 3 cultivars together, there was a significant increase in GP production from the first (4.0%) to the third (8.9%) cycles. Redland presented higher GP percentages in each cycle and significant and steady GP production increased along the 3 cycles: 4.8, 13.4 and 19.7%, respectively, and should be included in further attempts to obtain sexual polyploids.
	
Palavras-Chave: 	Duplicação cromossômica meiótica; Gametas não reduzidos; Meiotic chromosome doubling; Poliploidização sexual; Sexual polyploidization; Unreduced gametes.	
Thesagro: 	Trevo Vermelho; Trifolium Pratense.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Arroz e Feijão (CNPAF)	
Exemplares: 	CNPAF - (22876-1) - ADD - AP - -- - 631.05 - C - 2004.00350 - DIS