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Plant Physiology 68:610-615 (1981)
© 1981 American Society of Plant Biologists

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Articles

The Coupling of Electron Flow to ATP Synthesis in Pea and Maize Mesophyll Chloroplasts 1,2

I. INTERACTION OF ADENINE NUCLEOTIDES AND ENERGY TRANSFER INHIBITORS WITH THE COUPLING FACTOR COMPLEX

Richard M. Cole3, Wendy A. Macpeek and William S. Cohen

T. H. Morgan School of Biological Sciences, University of Kentucky, Lexington, Kentucky 40506

The rate of nonphosphorylating electron transport (in the absence of ADP and inorganic phosphate) in well-coupled (ATP/2e– = 0.9-1.1) maize mesophyll chloroplasts is not modulated by external pH (6.5-8.5), low levels of ADP or ATP, or energy transfer inhibitors, e.g. triphenyltin and Hg2+ ions. In contrast nonphosphorylating electron flow in pea chloroplasts is sensitive to alterations in medium pH, and to the presence of adenine nucleotides and energy transfer inhibitors in the assay medium. Although ATP is without effect on the rate of basal electron transport in maize chloroplasts, steady-state proton uptake is stimulated 3- to 5-fold by low levels of ATP. These results suggest that differences may exist in the manner in which the coupling factor complex controls proton efflux from the intrathylakoid space in C3 and C4 mesophyll chloroplasts.

3 Submitted to the Graduate School of the University of Kentucky in partial fulfillment of the requirements for the Master of Science degree.

1 This research was supported by National Science Foundation Grant PCM76-17214.

2 A preliminary report of this work was presented at the annual meeting of the American Society of Plant Physiologists, Columbus, Ohio, July 1979.






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Copyright © 1981 by the American Society of Plant Biologists