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AOBPreview originally published online on February 23, 2004
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Annals of Botany 93: 473-475, 2004
© 2004 Annals of Botany Company

Acclimation of Photosynthesis to Light and Canopy Nitrogen Distribution: an Interpretation

J. H. M. THORNLEY*

Centre for Ecology & Hydrology, Bush Estate, Penicuik, Midlothian EH26 0QB, UK

* Correspondence to J. H. M. Thornley, 6 Makins Road, Henley-on-Thames, Oxfordshire RG9 1PP, UK. E-mail johnthornley{at}care4free.net Reprint requests to Professor M. G. R. Cannell, Centre for Ecology & Hydrology, Bush Estate, Penicuik, Midlothian EH26 0QB, UK. E-mail mgrc{at}ceh.ac.uk

Received: 8 October 2003; Returned for revision: 11 November 2003; Accepted: 5 December 2003; Published electronically: 23 February 2004

Background and Aims Acclimation of photosynthesis to light and its connection with canopy nitrogen (N) distribution are considered. An interpretation of a proportionality between light-saturated photosynthesis and local averaged leaf irradiance is proposed by means of a simple model.

Model The model assumes (a) local irradiance drives synthesis of photosynthetic protein from metabolic N; (b) photosynthetic N is slowly degraded over approx. 5–7 d; (c) metabolic N is equally available through the canopy.

Conclusions The kinetics of acclimation at different light levels may provide a way of parameterizing and testing the model. The model provides a rationale for the proportionality assumption mentioned above, which, while it is consistent with much experimental work, is valuable because it allows canopy photosynthesis to be calculated analytically.

Key words: Photosynthesis, acclimation, light, nitrogen.


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