, Volume 183, Issue 4, pp 620-622

The relationship between the activation state of sucrose-phosphate synthase and the rate of CO2 assimilation in spinach leaves

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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.

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.