Abstract
The relationship between the gas-exchange characteristics of spinach (Spinacia oleracea L.) leaves and the activation state of sucrose-phosphate synthase was examined at different intercellular partial pressures of CO2 at two different photon flux densities. There was a strong positive correlation between the activation state of sucrose-phosphate synthase and the assimilation rate. The relationship was the same at both photon flux densities, indicating that the activation state of the enzyme is determined by a product of carbon assimilation, rather than directly by light.
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Abbreviations
- A:
-
assimilation rate for CO2
- p i :
-
intercellular CO2pressure
- PFD:
-
photon flux density
- SPS:
-
sucrose-phosphate-synthase
- Glc6P:
-
glucose-6-phosphate
- Fru6P:
-
fructose-6-phosphate
References
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A.B. was the recipient of a visiting fellowship from the National Research Council of the Italy. This work was also supported by the Science and Engineering Research Council and the Agricultural and Food Research Council, UK.
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Battistelli, A., Adcock, M.D. & Leegood, R.C. The relationship between the activation state of sucrose-phosphate synthase and the rate of CO2 assimilation in spinach leaves. Planta 183, 620–622 (1991). https://doi.org/10.1007/BF00194285
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DOI: https://doi.org/10.1007/BF00194285