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Concentration of photosynthetic pigments and chlorophyll fluorescence of mahogany and tonka bean under two light environments Rev. Bras. Fisiol. Veg.
GONÇALVES,JOSÉ FRANCISCO DE CARVALHO; MARENCO,RICARDO ANTONIO; VIEIRA,GIL.
This study was carried out in a plantation of a degraded area in Central Amazon, Brazil, in order to assess environmental light effects on leaf pigment concentrations and chlorophyll a fluorescence in mahogany (Swietenia macrophylla King) and tonka bean (Dipteryx odorata Aubl. Willd). Three-year old saplings were grown in an open site (sun) with maximum radiation of approximately 2000 mumol m-2 s-1 and under the shade of a Ochroma pyramidale (Cav. ex Lam. Urb) canopy. A leaf area index of 2.46 was optically determined for the Ochroma foliage with 13% of full sunlight (maximum radiation about 260 mumol m-2 s-1). Carotenoid and chlorophyll concentrations were spectrophotometrically determined. Initial (Fo), maximum (Fm) and variable fluorescence (Fv) were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Carotenoid; Dipteryx odorata; Swietenia macrophylla; Tropical species.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-31312001000200004
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