Data/hora: 16/06/2024 17:38:04

Biblioteca(s): 	Embrapa Arroz e Feijão.	
Data corrente: 	20/10/2004	
Data da última atualização: 	26/10/2004	
Autoria: 	GONÇALVES, P. de S.; MARTINS, A. L. M.	
Título: 	Combining ability effects of clonal rootstocks and scions in rubber trees (Hevea).	
Ano de publicação: 	2002	
Fonte/Imprenta: 	Crop Breeding and Applied Biotechnology, Londrina, v. 2, n. 3, p. 445-451, Sept. 2002.	
Idioma: 	Inglês	
Conteúdo: 	Rotstocks and scions combinations of five rubber tree [Hevea brasiliensis (Willd. ex Adr. de Juss.) Muell-Arg.] clones were evaluated for rubber yield  and growth vigor to detect the rootstock with the best general combining ability (GCA) and the best specific combining ability (SCA), using the method 1, suggested by Griffing. The clones (scions) involved were: IAN 873, RRIM 600, RRIM 701, PB 235 and GT 1 grafted in five different rootstocks from illegitimate seeds ot the same clones. The ANOVA mean squares for GCA and SCA reciprocal effects were highly significant for both characters. The general GCA: SCA ratios were 24:1 and 4:1 for rubber yield and growth vigour, respectively. The rootstock of the RRIM 600 clone was the best general combiner for rubber yield (gi = 8.25), followed by the PB 235 (gi = 5.20). Although negative, the rootstock of the RRIM 600 clone showed the best GCA (gi = 0.0354( for growth vigour, followed by rootstock of the GT 1 clone which presented a gi = 0.5194 value. The maximum SCA effects for rubber yield (sij = 5.55) was obtained by IAN 873 rootstocks combined with the RRIM 600 clone as scion, followed by the PB 235 (rootstock) combined with the RRIM 600 scions (sij = 3.06). For growth vigour, the best specific combining ability effect of sij = -1.64 was obtained by the IAN 873 clone in combination with the RRIM  701 clone, with their respective rootstock and scion. As for rubber yield, the RRIM 600 rootstocks were classified as the best general combination. In addition, the IAN 873 rootstocks combined with the RRIM 600 scion showed the best specific combining ability.
	
Palavras-Chave: 	Enxertos clonais; Rootstock; Rubber tree; Scion.	
Thesagro: 	Hevea Brasiliensis; Seringueira.	
Thesaurus Nal: 	general combining ability; specific combining ability.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Arroz e Feijão (CNPAF)	
Exemplares: 	CNPAF - (21750-1) - ADD - AP - -- - 631.05 - C - 2004.00110 - DIS