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Plant Physiology 81:1123-1129 (1986)
© 1986 American Society of Plant Biologists

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Articles

Limitation of Photosynthesis by Carbon Metabolism 1

II. O2-Insensitive CO2 Uptake Results from Limitation Of Triose Phosphate Utilization

Thomas D. Sharkey2, Mark Stitt, Dieter Heineke, Richard Gerhardt, Klaus Raschke and Hans W. Heldt

Institut für Biochemie der Pflanze, Untere Karspüle 2, 3400 Göttingen, Federal Republic of Germany, Pflanzenphysiologisches Institut der Universität Göttingen, Untere Karspüle 2, 3400 Göttingen, Federal Republic of Germany

The occurrence of O2-insensitive photosynthesis at high quantum flux and moderate temperature in Spinacia oleracea was characterized by analytical gas exchange measurements on intact leaves. In addition photosynthetic metabolite pools were measured in leaves which had been rapidly frozen under defined gas conditions. Upon switching to low O2 in O2-insensitive conditions the ATP/ADP ratio fell dramatically within one minute. The P-glycerate pool increased over the same time. Ribulose bisphosphate initially declined, then increased and exceeded the pool size measured in air. The pools of hexose monophosphates and UDPglucose were higher at a partial pressure of O2 of 21 millibars than at 210 millibars. These results are consistent with the hypothesis that the rate of sucrose synthesis limited the overall rate of assimilation under O2-insensitive conditions.

2 Permanent address: Desert Research Institute, P.O. Box 60220, Reno, NV 89506.

1 Supported by the Deutsche Forschungsgemeinschaft, National Science Foundation grants INT-8411180 and PCM 8304775, and Department of Energy grant DE-FG08-84ER13234.




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