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Annals of Botany 81: 421-430, 1998
© 1998 Annals of Botany Company

Dynamic Model of Leaf Photosynthesis with Acclimation to Light and Nitrogen

J. H. M. THORNLEY

Institute of Terrestrial Ecology (Edinburgh), Bush Estate, Penicuik, Midlothian, EH26 0QB, UK

August 26, 1997 ; November 19, 1997 .

A simple model of photosynthesis in a mature C3leaf is described, based on a non-rectangular hyperbola: the model allows the high-light asymptote of that equation (Pmax) to respond dynamically to light and nitrogen. This causes the leaf light response equation to acclimate continuously to the current conditions of light and N nutrition, which can vary greatly within a crop canopy, and through a growing season, with important consequences for gross production. Predictions are presented for the dynamics of acclimation, acclimated and non-acclimated photosynthetic rates are compared, and the dependence of leaf properties on light and N availability is explored. There is good correspondence of predictions with experimental results at the leaf level. The model also provides a mechanism for a down regulation of photosynthesis in response to increased carbon dioxide concentrations, whose magnitude will depend on conditions, particularly of nitrogen nutrition.Copyright 1998 Annals of Botany Company

Leaf, photosynthesis, hyperbola, model, C3, acclimation, light, nitrogen.


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