Data/hora: 02/06/2024 11:18:39

Provedor de dados: 	52	
País: 	Brazil	
Título: 	Morphological and physiological responses of Cedrela Fissilis Vellozo (Meliaceae) seedlings to light	
Autores: 	Santos,Débora Leonardo dos; Rakocevic,Miroslava; Takaki,Massanori; Ribaski,Jorge.	
Data: 	2006-01-01	
Ano: 	2006	
Palavras-chave: 	Photosynthesis; Seedling morphogenesis; Shade.	
Resumo: 	Seeds of Cedrela fissilis Vellozo were planted and maintained under two distinct conditions: at east border of a forest with red: far-red ratio of 1.15 and under canopy with photosynthetic photon flux density of 0.22-7% of full sun radiation and red: far-red ratio of 0.21-0.36. Seedling growth (height and stem diameter) was faster under sun, the development of roots more continuous and the number of leaves almost twice of that of shade plants. The leaf area was 10 times greater in sun plants with 15-25 leaflets per leaf while under shade only 5 to 10 leaflets were found per leaf. In shade plants, a higher proportion of dry mass was found in aerial parts. Leaves of sun plants had the capacity of gas exchange to respond to high light radiation, but leaves adapted to shade presented a lower response to light changes. When shade plants were transferred and maintained under the sun for 15 days, only the young leaves were adapted to increased light radiation, reaching the same photosynthetic rate as sun plants, while old leaves were shed. Sun plants transferred to shade conditions did not lose leaves, but did not reach the same photosynthetic rate attained by shade plants.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000100020	
Editor: 	Instituto de Tecnologia do Paraná - Tecpar	
Relação: 	10.1590/S1516-89132006000100020	
Formato: 	text/html	
Fonte: 	Brazilian Archives of Biology and Technology  v.49 n.1 2006	
Fonte: 	info:eu-repo/semantics/openAccess