Data/hora: 12/06/2024 08:30:58

Provedor de dados: 	61	
País: 	Brazil	
Título: 	Morphological and physiological adjustments of Brazilwood (Caesalpinia echinata Lam.) to direct solar radiation	
Autores: 	Mengarda,Liana Hilda Golin; Milanez,Camilla Rozindo Dias; Silva,Diolina Moura; Aguilar,Marco Antonio Galeas; Cuzzuol,Geraldo Rogério Faustini.	
Data: 	2012-09-01	
Ano: 	2012	
Palavras-chave: 	Forest succession; Light stress; Photoinhibition; Leaf anatomy; Soluble carbohydrates.	
Resumo: 	This study aimed to characterize the alarm and resistance phases of stress of Caesalpinia echinata under intense irradiance in order to better define its position on forest succession. The alarm phase was identified by rapid reduction in the maximum quantum yield of PSII primary photochemical reactions (ΦP0 = FV/FM) and Performance Index (PIABS) followed by total leaf abscission in the first week of exposure to direct sunlight. The new leaves grown showed recovery of chlorophyll a parameters, increase in blade thickness, elongation of the palisade and spongy parenchymas, higher water content, and reduction of specific leaf area. These changes were associated with the osmoprotector of sucrose and antioxidative of raffinose effects, which indicate an efficient adjustment system to intense irradiance in the resistance phase of stress. However, the continuous decrease in photosynthetic pigments in the resistance phase combined with the photodamage in the fluorescence of Chl a and total abscission of leaves in the alarm phase are strong indications that C. echinata is a shade and late or climax species in forest succession.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202012000300003	
Editor: 	Brazilian Journal of Plant Physiology	
Relação: 	10.1590/S1677-04202012000300003	
Formato: 	text/html	
Fonte: 	Brazilian Journal of Plant Physiology  v.24 n.3 2012	
Fonte: 	info:eu-repo/semantics/openAccess