Photosynthetica 2011, 49(4):619-626 | DOI: 10.1007/s11099-011-0077-0

Chloroplastidic pigments, gas exchange, and carbohydrates changes during Carapa guianensis leaflet expansion

F. K. C. Moraes1, G. L. S. Castro1, D. D. Silva Júnior1, H. A. Pinheiro1,*, R. A. Festucci-Buselli1
1 Centro de Tecnologia Agropecuária, Instituto Sócioambiental e dos Recursos Hídricos, Universidade Federal Rural da Amazônia, Belém, Brazil

Changes in chloroplastidic pigments, gas exchange and carbohydrate concentrations were assessed during the rapid initial expansion of C. guianensis leaflet. Leaves at metaphyll stage were tagged and assessments were carried out 14, 17, 20, 23, 27, and 31 days later. Pigments synthesis, distribution and accumulation were uniform among leaflet sections (basal, median and apical). Chlorophyll (Chl) a, Chl b, Chl (a+b), and total carotenoids (Car) concentrations were significantly increased after 27 days from metaphyll, and the most expressive increases were parallel to lower specific leaflet area. Chl a/b was lower on day 14 and it was increased on subsequent days. Negative net photosynthesis rate (P N), and the lowest stomatal conductance (g s) and transpiration (E) were registered on day 14, following significant increases on subsequent days. The Chl (a+b) and Chl a effects on P N were more expressive until day 20. Intercellular to ambient CO2 concentration ratio (C i/C a) was higher on day 14 and lower on subsequent days, and no stomatal limitation to CO2 influx inside leaflets was observed. Leaflet temperature was almost constant (ca. 35°C) during leaflet development. Sucrose and starch concentrations were increased in parallel to increases in P N. Altogether, these results highlight the main physiological changes during C. guianensis leaflet expansion and they should be considered in future experiments focusing on factors affecting P N in this species.

Keywords: carbohydrates; chlorophyll; leaf age; leaf expansion; leaf gas exchange

Received: February 15, 2011; Accepted: August 9, 2011; Published: December 1, 2011Show citation

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Moraes, F.K.C., Castro, G.L.S., Júnior, D.D., Pinheiro, H.A., & Festucci-Buselli, R.A. (2011). Chloroplastidic pigments, gas exchange, and carbohydrates changes during Carapa guianensis leaflet expansion. Photosynthetica, 49(4), 619-626. doi: 10.1007/s11099-011-0077-0.
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