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Temperature acclimation in a biochemical model of photosynthesis: a reanalysis of data from 36 species
Author(s) -
KATTGE JENS,
KNORR WOLFGANG
Publication year - 2007
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.2007.01690.x
Subject(s) - photosynthesis , cmax , acclimatization , base (topology) , arrhenius equation , entropy (arrow of time) , growth rate , chemistry , thermodynamics , activation energy , botany , horticulture , biology , mathematics , physics , geometry , mathematical analysis , bioinformatics , bioavailability
The Farquhar et al. model of C 3 photosynthesis is frequently used to study the effect of global changes on the biosphere. Its two main parameters representing photosynthetic capacity, V cmax and J max , have been observed to acclimate to plant growth temperature for single species, but a general formulation has never been derived. Here, we present a reanalysis of data from 36 plant species to quantify the temperature dependence of V cmax and J max with a focus on plant growth temperature, i.e. the plants' average ambient temperature during the preceding month. The temperature dependence of V cmax and J max within each data set was described very well by a modified Arrhenius function that accounts for a decrease of V cmax and J max at high temperatures. Three parameters were optimized: base rate, activation energy and entropy term. An effect of plant growth temperature on base rate and activation energy could not be observed, but it significantly affected the entropy term. This caused the optimum temperature of V cmax and J max to increase by 0.44 °C and 0.33 °C per 1 °C increase of growth temperature. While the base rate of V cmax and J max seemed not to be affected, the ratio J max : V cmax at 25 °C significantly decreased with increasing growth temperature. This moderate temperature acclimation is sufficient to double‐modelled photosynthesis at 40 °C, if plants are grown at 25 °C instead of 17 °C.