Seasonal chlorophyll variations in Tabebuia avellanedae and Anadenanthera colubrine leaves

• Autor(a) principal: Freiberger, Mariângela Brito [UNESP]
• Data de Publicação: 2010
• Outros Autores: Castoldi, Gustavo [UNESP], Marini, Deniele, Lang, Aleteia, Herzog, Neusa Francisca Michelon, Malavasi, Ubirajara Contro
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.5433/1679-0359.2010v31n4sup1p1343; http://hdl.handle.net/11449/219707
• topic: Acclimation; Heliophytic species; Luminosity

The experiment had the aim of quantifying seasonal chlorophyll variation on leaves of Anadenanthera colubrina and Tabebuia avellanedae. The experiment used a randomized block design established as a 2 x 3 factorial (two species and three sampling seasons) with 5 replications. The concentrations of chlorophyll in leaves were performed at the end of winter, late spring, and summer. The content of chlorophyll a changed only for A. colubrina, bringing up from spring (117.52 ?g mL-1) to summer (151.13 ?g mL-1). For the two species, the proportion of chlorophyll b was higher between periods at the end of spring (average of 29.31 μg mL-1) to the end of summer (average of 74.96 ?g mL-1) with close relationship with the decrease in global solar irradiance. The chlorophyll a/b relationship increased in late spring due to reduction of chlorophyll b content. A. colubrina showed greater adaptation to the studied environment.