Photosynthetica 2001, 39(4):539-543 | DOI: 10.1023/A:1015699927924

Photosynthesis and Leaf Nutrient Contents in Ochroma Pyramidale (Bombacaceae)

R.A. Marenco, J.F. de C. Gonçalves, G. Vieira

In Ochroma pyramidale (Cav. ex Lam.) Urb., photon-saturated photosynthetic capacity (PNmax) was 13 μmol(CO2) m-2 s-1. Average stomatal conductance (gs) and water-use efficiency (WUE) were greater at high irradiance, about 260 mmol(H2O) m-2 s-1 and 2.15 g(C) kg-1(H2O), respectively. In the dark, gs values were about 30% of maximum gs. Leaf nutrient contents on a leaf area basis were 131, 15, 36, 21, and 12 mmol m-2 for N, P, K, Ca, and Mg, respectively. Ochroma also accumulated a greater amount of soluble saccharides than starch, 128 versus 90 g kg-1 (DM). The availability of N and Mg, but not P, Ca, or K, may limit photosynthetic rates of Ochroma in this site.

Additional key words: Amazonia; balsa wood; Ca; foliar nutrients; Mg; NPK; starch; stomatal conductance; transpiration; water-use efficiency

Published: December 1, 2001  Show citation

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Marenco, R.A., de Gonçalves, J.F.C., & Vieira, G. (2001). Photosynthesis and Leaf Nutrient Contents in Ochroma Pyramidale (Bombacaceae). Photosynthetica, 39(4), 539-543. doi: 10.1023/A:1015699927924
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