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Control of photosynthetic carbon dioxide fixation by the boundary layer, stomata and ribulose 1,5‐biphosphate carboxylase/oxygenase
Author(s) -
WOODROW I. E.,
BALL J. T.,
BERRY J. A.
Publication year - 1990
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.1365-3040.1990.tb02137.x
Subject(s) - photosynthesis , rubisco , carbon fixation , ribulose 1,5 bisphosphate , pyruvate carboxylase , carbon dioxide , oxygenase , chemistry , ribulose , conductance , planetary boundary layer , stomatal conductance , flux (metallurgy) , botany , boundary layer , biochemistry , physics , biology , thermodynamics , enzyme , organic chemistry , condensed matter physics
Coefficients describing the sensitivity of the rate of photosynthetic carbon dioxide fixation to small changes in the stomatal conductance and boundary layer conductance are derived. These sensitivity or ‘control’ coefficients, together with those for the carboxylase and oxygenase activities of ribulose 1,5‐bisphosphate carboxylase/oxygenase, are calculated from standard gas exchange data and apply under conditions where leaf temperature and water vapour concentration at the leaf surface remain largely constant. It is shown that the magnitude of the control coefficients depends on conditions such as photon flux density, ambient CO 2 concentration and relative humidity at the leaf surface. The extension of this analysis to encompass the sensitivity of the photosynthetic fluxes to changes in enzyme concentrations and kinetic properties is also discussed.