Plant Physiol.
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Plant Physiology 73:1038-1041 (1983)
© 1983 American Society of Plant Biologists

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Articles

Photoreduction of Oxygen in Mesophyll Chloroplasts of C4 Plants

A Model System for Studying an in Vivo Mehler Reaction

Robert T. Furbank1, Murray R. Badger and C. B. Osmond

Department of Environmental Biology, Research School of Biological Sciences, Australian National University, P.O. Box 475, Canberra, A.C.T. 2601, Australia

Mesophyll chloroplasts of three C4 sub types, Panicum miliaceum (NAD-malic enzyme), Panicum maximum (PCK), and Zea mays (NADP-malic enzyme), were prepared from protoplast extracts and used to study the photoreduction of O2. The processes of O2 uptake and evolution in these preparations, which lack ribulose 1,5-bisphosphate carboxylase/oxygenase, were studied simultaneously using stable isotopes of O2 and mass spectrometry. The responses of O2 uptake to O2 tension and addition of various substrates (3-phosphoglycerate, pyruvate, and oxaloacetate) were studied in detail. The addition of photosynthetic substrates differing in ATP to NADPH demands indicated that photoreduction of O2 in these chloroplast preparations is linked to ATP production and strongly regulated by NADP+ levels. The results clearly indicate that photoreduction of O2 could be of physiological relevance in balancing the ATP to NADPH requirements of C4 mesophyll chloroplasts.

1 Current address: A.R.C. Research Group on Photosynthesis, Dept. of Biology, University of Sheffield, Sheffield S10 2TN England.






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Copyright © 1983 by the American Society of Plant Biologists