Data/hora: 16/06/2024 06:14:44

Provedor de dados: 	52	
País: 	Brazil	
Título: 	Seed reserves partition and light compensation point of mahogany (Swietenia macrophylla King) seedlings growth under low photosynthetic active radiation	
Autores: 	Lemos Filho,José Pires de; Duarte,Ricardo Jenner.	
Data: 	1998-01-01	
Ano: 	1998	
Palavras-chave: 	Swietenia macrophylla; Dry mass partition; Light compensation point; Shade adaptation.	
Resumo: 	The aim of this study was to verify the dry mass partition of the seed reserves during the initial growth of Swietenia macrophylla seedlings, in the dark, and at low levels of photosynthetically active radiation: 0.125; 3.12 and 52 µ mol.m-2.s-1. After 50 days, the dry mass of the seed reserves did not differ with treatments, but the total dry mass and leaf area were higher in the seedlings under higher light treatment. No difference in root/shoot ratio was observed between treatments, but the leaf area ratio was lower at higher light. Only the seedlings grown at 52 µ mol.m-2.s-1 showed a positive dry mass increase in relation to the mobilized seed reserves. With the values of the net increase of the seedling mass, a linear equation was adjusted in relation to the light levels, permitting to determine 3.76 µ mol.m-2.s-1 as the seedling light compensation point. These results explain the shade tolerance of the S. macrophylla seedlings.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131998000200006	
Editor: 	Instituto de Tecnologia do Paraná - Tecpar	
Relação: 	10.1590/S1516-89131998000200006	
Formato: 	text/html	
Fonte: 	Brazilian Archives of Biology and Technology  v.41 n.2 1998	
Fonte: 	info:eu-repo/semantics/openAccess