Data/hora: 01/06/2024 01:26:00

Biblioteca(s): 	Embrapa Florestas.	
Data corrente: 	27/09/2006	
Data da última atualização: 	21/05/2024	
Autoria: 	RAJORA, O. P.	
Título: 	Pollen competition among Populus deltoides Marsh., P. nigra L. and P. maximowiczii Henry in fertilizing P. deltoides ovules and siring its seed crop.	
Ano de publicação: 	1989	
Fonte/Imprenta: 	Sexual Plant Reproduction, Heidleberg, v. 2, n. 2, p. 90-96, 1989.	
Idioma: 	Inglês	
Conteúdo: 	Interspecific pollen competition among P. deltoides, P. nigra and P. maximowiczii in fertilizing P. deltoides ovules was studied by using a pollen mixture technique and evaluating isoenzymes and leaf morphology. The frequencies of F1 seedlings of different paternities in pollen-mix crosses showed highly significant departures from the 1 : 1 ratio expected if pollen selection was random. P. deltoides pollen was the most competitive. The mean percentages of F1 seedlings of P. deltoides paternity in crosses with P. deltoides + P. nigra, P. deltoides + P. maximowiczii, and P. deltoides + P. nigra + P. maximowiczii pollen mixtures were 95.0, 92.5 and 84.8%, respectively. P. maximowiczii pollen was more competitive than P. nigra pollen, which was at a selective disadvantage. An average of 83.6% of F1 progenies of the 8 crosses with P. nigra + P. maximowiczii pollen showed P. maximowiczii paternity. Also, in 4 crosses with P. deltoides + P. nigra + P. maximowiczii pollen, the relative proportion of P. deltoides X P. maximowiczii seedlings (13.4%) was higher than that of P. deltoides X P. nigra seedlings (1.8%). Pollen proportions in the pollen mixtures and pollen size did not significantly affect the competitive ability of the pollen. The relative pollen competitive ability indicated reproductive affinities among the species.	
Palavras-Chave: 	Broadleaves; Isoenzyma; Isoenzymes; Pollen competition; Poplars; Selecao gametica; Self pollination.	
Thesagro: 	Hibrido; Pólen.	
Thesaurus Nal: 	biotechnology; cross pollination; forest trees; interspecific hybridization; pollination; Populus.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Florestas (CNPF)	
Exemplares: 	CNPF - (1078-1) - ADC - AP - DD -  -  -  - DIS