J H M Thornley1. 1. Centre for Ecology & Hydrology, Bush Estate, Penicuik, Midlothian EH26 0QB, UK. johnthornley@care4free.net
Abstract
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.
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.
Authors: Ela Frak; Xavier Le Roux; Peter Millard; Boris Adam; Erwin Dreyer; Cynthia Escuit; Hervé Sinoquet; Marc Vandame; Claude Varlet-Grancher Journal: J Exp Bot Date: 2002-11 Impact factor: 6.992
Authors: Vanessa Haverd; Benjamin Smith; Josep G Canadell; Matthias Cuntz; Sara Mikaloff-Fletcher; Graham Farquhar; William Woodgate; Peter R Briggs; Cathy M Trudinger Journal: Glob Chang Biol Date: 2020-02-04 Impact factor: 10.863