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Plant Physiology 76:763-768 (1984)
© 1984 American Society of Plant Biologists

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Articles

Effects of Decreased Net Carbon Exchange on Carbohydrate Metabolism in Sugar Beet Source Leaves 1

Theodore C. Fox2 and Donald R. Geiger

Department of Biology, University of Dayton, Dayton, Ohio 45469

The relationship between CO2 concentration and starch synthesis and degradation was studied by measuring leaf starch content and disappearance of 14C-starch. At a concentration of 340 microliters CO2 per liter, starch accumulated without degradation of previously synthesized starch. Degradation of starch began when CO2 concentration was lowered, but its synthesis continued. At 120 microliters CO2 per liter rates of synthesis and degradation were equal. Even at the CO2 compensation point, synthesis of starch continued. Concomitant starch synthesis and mobilization supported export from the leaf. Changes in starch metabolism that occur when photosynthesis is CO2-limited provide a means to study regulation of starch metabolism and carbon allocation in translocating leaves.

2 Present address: Department of Horticulture and Landscape Architecture, Washington State University, Pullman, Washington 99164-6414.

1 Supported by Grants PCM-8008720 and PCM-8303957 from the National Science Foundation.




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Copyright © 1984 by the American Society of Plant Biologists