Document Detail

Temperature acclimation in a biochemical model of photosynthesis: a reanalysis of data from 36 species.
MedLine Citation:
PMID:  17661754     Owner:  NLM     Status:  MEDLINE    
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 degrees C and 0.33 degrees C per 1 degrees 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 degrees C significantly decreased with increasing growth temperature. This moderate temperature acclimation is sufficient to double-modelled photosynthesis at 40 degrees C, if plants are grown at 25 degrees C instead of 17 degrees C.
Jens Kattge; Wolfgang Knorr
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Plant, cell & environment     Volume:  30     ISSN:  0140-7791     ISO Abbreviation:  Plant Cell Environ.     Publication Date:  2007 Sep 
Date Detail:
Created Date:  2007-07-30     Completed Date:  2007-11-13     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9309004     Medline TA:  Plant Cell Environ     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1176-90     Citation Subset:  IM    
Max-Planck Institute for Biogeochemistry, Hans-Knöll-Str. 10, 07745 Jena, Germany.
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MeSH Terms
Carbon Dioxide / physiology*
Linear Models
Models, Biological
Photosynthesis / physiology*
Plant Physiological Phenomena
Plants / metabolism*
Reg. No./Substance:
124-38-9/Carbon Dioxide

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