Abstract
A model of the C 3 photosynthetic system is developed which describes the sensitivity of the steadystate rate of carbon dioxide assimilation to changes in the activity of several enzymes of the system. The model requires measurements of the steady-state rate of carbon dioxide assimilation, the concentrations of several intermediates in the photosynthetic system, and the concentration of the active site of ribulose 1,5-bisphosphate carboxyalse/oxygenase (Rubisco). It is shown that in sunflowers (Helianthus annuus L.) at photon flux densities that are largely saturating for the rate of photosynthesis, the steady-stete rate of carbon dioxide assimilation is most sensitive to Rubisco activity and, to a lesser degree, to the activities of the stromal fructose, 6-bisphosphatase and the enzymes catalysing sucrose synthesis. The activities of sedoheptulose 1,7-bisphosphatase, ribulose 5-phosphate kinase, ATP synthase and the ADP-glucose pyrophosphorylase are calculated to have a negligible effect on the flux under the high-light conditions. The utility of this analysis in developing simpler models of photosynthesis is also discussed.
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Abbreviations
- c i :
-
intercellular CO2 concentration
- C supJinfP :
-
control coefficient for enzyme P with respect to flux J
- DHAP:
-
dihydroxyacetonephosphate
- E4P:
-
erythrose 4-phosphate
- F6P:
-
fructose 6-phosphate
- FBP:
-
fructose 1,6-bisphosphate
- FBPase:
-
fructose 1,6-bisphosphatase
- G3P:
-
glyceraldehyde 3-phosphate
- G1P:
-
glucose 1-phosphate
- G6P:
-
glucose 6-phosphate
- Pi:
-
inorganic phosphate
- PCR:
-
photosynthetic carbon reduction
- PGA:
-
3-phosphoglyceric acid
- PPFD:
-
photosynthetically active photon flux density
- R Jn :
-
response coefficient for effector n with respect to flux J
- R5P:
-
ribose 5-phosphate
- Rubisco:
-
ribulose 1,5-bisphosphate carboxylase/oxygenase
- Ru5P:
-
ribulose 5-phosphate
- RuBP:
-
ribulose 1,5-bisphosphate
- S7P:
-
sedoheptulose 7-phosphate
- SBP:
-
sedoheptulose 1,7-bisphosphate
- SBPase:
-
sedoheptulose 1,7-bisphosphatase
- SPS:
-
sucrose-phosphate synthase
- Xu5P:
-
xylulose 5-phosphate
- ɛ P n :
-
elasticity coefficient for effector n with respect to the catalytic velocity of enzyme P
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This research was funded by an Australian Research Council grant to I.E.W. and was undertaken during a visity by K.A.M. to the James Cook University of North Queensland. The expert help of Glenys Hanley and Mick Kelly is greatly appreciated.
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Woodrow, I.E., Mott, K.A. Modelling C3 photosynthesis: A sensitivity analysis of the photosynthetic carbon-reduction cycle. Planta 191, 421–432 (1993). https://doi.org/10.1007/BF00195743
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DOI: https://doi.org/10.1007/BF00195743