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

Document Type

Article

Publication Date

11-1-1984

Publication Source

Plant Physiology

Abstract

The relationship between CO2 concentration and starch synthesis and degradation was studied by measuring leaf starch content and disappearance of14C-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.

Inclusive pages

763-768

ISBN/ISSN

0032-0889

Publisher

American Society of Plant Biologists

Volume

76

Peer Reviewed

yes

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