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Plant Physiology 83:69-74 (1987)
© 1987 American Society of Plant Biologists

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Environmental and Stress Physiology

Influences of Leaf Temperature on Photosynthetic Carbon Metabolism in Wheat 1

John Kobza and Gerald E. Edwards

Department of Botany, Washington State University, Pullman, Washington 99164-4230

Net photosynthetic assimilation rate (A), extractable activities of three photosynthetic enzymes, and the concentrations of six metabolites were determined for wheat (Tricum aestivum L.) leaves as leaf temperature was varied under photorespiring (350 microliters per liter CO2 and 21% O2) and under nonphotorespiring conditions (800 microliters per liter CO2 and 2% O2). The extractable activity of ribulose-1,5-bisphosphate carboxylase (Rubisco) and fructose-1,6-bisphosphatase declined with increasing leaf temperature from 15 to 45°C. Leaf concentrations of ribulose-1,5-bisphosphate (RuBP) declined slightly between 15 and 25°C but increased to a level which is 4 to 5 times the binding site concentration of Rubisco at leaf temperatures of 35 and 45°C. Leaf concentrations of 3-phosphoglycerate, fructose-6-phosphate, and glucose-6-phosphate all declined with increasing leaf temperature. Outside of the limitations imposed by photorespiration, it is proposed that under high light and at suboptimal temperatures, A is limited by rate of utilization of triose phosphate; at optimal temperatures, by the availability of substrate (CO2 and RuBP) under photorespiring conditions or utilization of triose phosphate under nonphotorespiring conditions; and at supraoptimal temperatures, by the activation state of Rubisco.

1 Supported by the Science and Education Administration of the United States Department of Agriculture under grant 83-CRCR-1-1321 from the Competitive Research Grant Office.




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