In vivo temperature response functions of parameters required to model RuBP-limited photosynthesis

The leaf model of C 3 photosynthesis of Farquhar, von Caemmerer & Berry ( Planta 149, 78‐90, 1980) provides the basis for scaling carbon exchange from leaf to canopy and Earth-System models, and is widely used to project biosphere responses to global change. This scaling requires using the leaf model over a wider temperature range than that for which the model was originally parameterized. The leaf model assumes that photosynthetic CO 2 uptake within a leaf is either limited by the rate of ribulose-1,5bisphosphate (RuBP) regeneration or the activity of RuBP carboxylase-oxygenase (Rubisco). Previously we reported a re-parameterization of the temperature responses of Rubisco activity that proved robust when applied to a range of species. Herein this is extended to re-parameterizing the response of RuBP-limited photosynthesis to temperature. RuBP-limited photosynthesis is assumed to depend on the whole chain electron transport rate, which is described as a three-parameter non-rectangular hyperbolic function of photon flux. Herein these three parameters are determined from simultaneous measurement of chlorophyll fluorescence and CO 2 exchange of tobacco leaves, at temperatures from 10 to 40 ∞ C. All varied significantly with temperature and were modified further with variation in growth temperature from 15 to 35 ∞ C. These parameters closely predicted the response of RuBP-limited photosynthesis to temperature measured in both lemon and poplar and showed a significant improvement over predictions based on earlier parameterizations. We provide the necessary equations for use of the model of Farquhar et al . (1980) with our newly derived temperature functions for predicting both Rubiscoand RuBP-limited photosynthesis.

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