The effect of leaf-level spatial variability in photosynthetic capacity on biochemical parameter estimates using the Farquhar model: a theoretical analysis.

Plant Physiology
Charles P ChenStephen P Long

Abstract

Application of the widely used Farquhar model of photosynthesis in interpretation of gas exchange data assumes that photosynthetic properties are homogeneous throughout the leaf. Previous studies showed that heterogeneity in stomatal conductance (g(s)) across a leaf could affect the shape of the measured leaf photosynthetic CO(2) uptake rate (A) versus intercellular CO(2) concentration (C(i)) response curve and, in turn, estimation of the critical biochemical parameters of this model. These are the maximum rates of carboxylation (V(c,max)), whole-chain electron transport (J(max)), and triose-P utilization (V(TPU)). The effects of spatial variation in V(c,max,) J(max), and V(TPU) on estimation of leaf averages of these parameters from A-C(i) curves measured on a whole leaf have not been investigated. A mathematical model incorporating defined degrees of spatial variability in V(c,max) and J(max) was constructed. One hundred and ten theoretical leaves were simulated, each with the same average V(c,max) and J(max), but different coefficients of variation of the mean (CV(VJ)) and varying correlation between V(c,max) and J(max) (Omega). Additionally, the interaction of variation in V(c,max) and J(max) with heterogeneity in V(TPU), g...Continue Reading

References

Jan 12, 2001·Plant Physiology·G D FarquharJ A Berry
Jun 1, 1997·Annual Review of Plant Physiology and Plant Molecular Biology·Bert G. DrakeSteve P. Long
Oct 26, 2005·Photosynthesis Research·Christine A Raines
Jul 31, 2007·Plant, Cell & Environment·Thomas D SharkeyEric L Singsaas
Jan 11, 2008·Proceedings of the National Academy of Sciences of the United States of America·Guillaume TcherkezGabriel Cornic
Sep 1, 2005·American Journal of Botany·Daniel M JohnsonCraig R Brodersen
Mar 1, 1992·Photosynthesis Research·I Terashima
Jun 1, 1991·Oecologia·Evan H De LuciaThomas A Day
May 1, 2002·Functional Plant Biology : FPB·Salvador Nogués, Leonor Alegre

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