Data/hora: 22/06/2024 04:57:00

Biblioteca(s): 	Embrapa Meio Norte / UEP-Parnaíba.	
Data corrente: 	18/08/1992	
Data da última atualização: 	18/08/1992	
Autoria: 	OVERBEK, J. van; GORDON, S. A.; GREGORY, L. E.	
Título: 	An analysis of the function of the leaf in the process of root formation in cuttings.	
Ano de publicação: 	1946	
Fonte/Imprenta: 	American Journal Botany, v.33, p.100-107, 1946.	
Idioma: 	Inglês	
Conteúdo: 	The combined action of auxin and factors coming from the is essential for root formation in cuttings (fig. 1, 2, 3, 4). The leaves exert their influence in the dark as well as in the light (fig. 5). In red hibiscus the root-forming factors of the leaves can be entirely replaced by sucrose and nitrogenous substances (fig. 3, 6, 8). Quantitative chemical analysis show that these substances are actually contributed to the cuttings by the leaves (fig. 9, 10). Effect of the number of leaveson the sugar content of the basal two inches of red hibiscus cuttings.Tests were made nine days after treatment and were calculated on a dryweight basis. One set of experiments was conducted on cuttings kept inthe light of a regular propagating frame, while another set was conducted on cuttings kept in the dark. Fifty cuttings were used for each determination. Increased of soluble nitrogen in the basal 1.5 inches of red hibiscus cuttings as a function of the time (abscissa) after the cuttings were placed in the propagating frame. Cuttings with two leaves show a more marked increase than defoliated ones. Averages of two experiments, in which 75 cuttings were used for each determination. The cuttings of one of these series are shown in figures 1 and 2.	
Palavras-Chave: 	Folhas; Iniciacao de raizes; Leaf; Nitrogen substances; Raiz primordia; Root; Root initiation; Substancias nitrogenadas.	
Thesagro: 	Açúcares; Auxina.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP)	
Exemplares: 	CPAMN-UEPP - (1074-1) - ADD - SP - -- -  -  - 1992.04569 - DIS