Abstract: The C3 photosynthesis model of Farquhar, von Caemmerer & Berry (1980) is widely used to predict CO2 exchange and inform ecophysiological research. Users typically estimate the model’s parameters by fitting it to response curves – a process fraught with potential errors and ambiguities (Long&Bernacchi, 2003; Dubois et al., 2007; Flexas et al., 2007; Rodeghiero et al., 2007; Sharkey et al., 2007; Kattge et al., 2009; Miao et al., 2009; Pons et al., 2009; Guet al., 2010; Gilbert et al., 2012; Tholen et al., 2012). This letter concerns a widespread but simple ambiguity in photosynthetic parameter estimation that has largely eluded attention.
We thank the Editor, Richard Norby, and three anonymous reviewers for helpful comments on an earlier draft. T.N.B. was supported by the US National Science Foundation (Award no. 1146514) and by the Grains Research and Development Corporation (GRDC). This work was funded by the Spanish Ministry of Science and Innovation (research project AGL2012-34544).
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