Photosynthetic acclimation in trees to rising atmospheric CO2: A broader perspective |
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Authors: | Carla A Gunderson Stan D Wullschleger |
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Institution: | (1) Environmental Sciences Division, Oak Ridge National Laboratory, Building 1506 MS-6034, P.O. Box 2008, 37831-6034 Oak Ridge, TN, USA |
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Abstract: | Analysis of leaf-level photosynthetic responses of 39 tree species grown in elevated concentrations of atmospheric CO2 indicated an average photosynthetic enhancement of 44% when measured at the growth CO2]. When photosynthesis was measured at a common ambient CO2], photosynthesis of plants grown at elevated CO2] was reduced, on average, 21% relative to ambient-grown trees, but variability was high. The evidence linking photosynthetic acclimation in trees with changes at the biochemical level is examined, along with anatomical and morphological changes in trees that impact leaf- and canopy-level photosynthetic response to CO2 enrichment. Nutrient limitations and variations in sink strength appear to influence photosynthetic acclimation, but the evidence in trees for one predominant factor controlling acclimation is lacking. Regardless of the mechanisms that underlie photosynthetic acclimation, it is doubtful that this response will be complete. A new focus on adjustments to rising CO2] at canopy, stand, and forest scales is needed to predict ecosystem response to a changing environment.Abbreviations A/Ci
photosynthesis as a function of internal CO2]
- Jmax
maximum rate of electron transport
- Rubisco
ribulose-1,5-bisphosphate carboxylase/oxygenase
- Vcmax
maximum rate of carboxylation
The U.S. Government right to retain a non-exclusive, royalty free licence in and to any copyright is acknowledged. |
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Keywords: | photosynthetic acclimation global carbon cycle elevated atmospheric CO2 trees |
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