Articles
MAXIMUM LEAF PHOTOSYNTHETIC LIGHT RESPONSE FOR ARAZA (EUGENIA STIPITATA MCVAUGH) PLANTS GROWING IN FOUR ENVIRONMENTS OF THE SOUTHERN COLOMBIAN AMAZONIAN REGION
Article number
928_22
Pages
187 – 192
Language
English
Abstract
Photosynthetic light response curves for Araza (Eugenia stipitata) leaves were studied under four different environments in the south of the Colombian Amazon.
The environments represented the four predominant physiographies of the Amazonian landscape: hilly, high terrace, low terrace and river plain.
To characterize the leaf photosynthetic response curve to the photosynthetically active radiation in each environment, measurements of CO2 exchange were made with a portable system on leaves exposed to photosynthetically active radiation values of 0-2001 µmol m-2 s-1 of photons.
Assimilation curves were adjusted using nonlinear regression.
The response rate of assimilation or photosynthesis to photon flux PPDF described a curvilinear progression, consisting of two phases: i) an initial linear increase in the rate of assimilation; ii) a gradual deceleration in the rate of assimilation with increasing quantity of light until a plateau (maximum rate of photosynthesis or assimilation) was reached.
We found different values in the maximum photosynthesis, compensation point of the specie in the different environments, although the apparent quantum yield was very similar in all cases.
The environments represented the four predominant physiographies of the Amazonian landscape: hilly, high terrace, low terrace and river plain.
To characterize the leaf photosynthetic response curve to the photosynthetically active radiation in each environment, measurements of CO2 exchange were made with a portable system on leaves exposed to photosynthetically active radiation values of 0-2001 µmol m-2 s-1 of photons.
Assimilation curves were adjusted using nonlinear regression.
The response rate of assimilation or photosynthesis to photon flux PPDF described a curvilinear progression, consisting of two phases: i) an initial linear increase in the rate of assimilation; ii) a gradual deceleration in the rate of assimilation with increasing quantity of light until a plateau (maximum rate of photosynthesis or assimilation) was reached.
We found different values in the maximum photosynthesis, compensation point of the specie in the different environments, although the apparent quantum yield was very similar in all cases.
Authors
J.A. Barrera, M.S. Hernández, A. Garcia, G. Vargas, D. Caicedo , O. Martínez, L.M. Melgarejo, J.P. Fernández-Trujillo
Keywords
compensation point, ecophysiology, Eugenia stipitata, assimilation maxima
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