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Plant Physiology 70:971-977 (1982)
© 1982 American Society of Plant Biologists

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Articles

Adenine Nucleotide Levels in the Cytosol, Chloroplasts, and Mitochondria of Wheat Leaf Protoplasts 1

Mark Stitt, Ross McC. Lilley2 and Hans W. Heldt

Lehrstuhl für Biochemie der Pflanze, Untere Karspüle 2, D 3400 Göttingen, Germany

Recently, a new method has been described, in which membrane filtration is used to allow the levels of adenine nucleotides in the chloroplast stroma, the cytosol, and the mitochondrial matrix to be measured. This method is now used to investigate the effect of illumination, of respiratory inhibitors, and of uncouplers on the distribution of ATP, ADP, and AMP in wheat (Triticum aestivum var. `Timmo') leaf protoplasts. (a) The adenine nucleotides are apparently equilibrated by adenylate kinase in the stroma and the cytosol, but not in the mitochondrial matrix. (b) The ATP/ADP quotient in the cytosol is considerably higher than that in the mitochondrial matrix or the chloroplast stroma. (c) A large gradient exists between the ATP/ADP quotients in the cytosol and the mitochondrial matrix in the dark, with a very low ATP/ADP quotient in the mitochondria. This gradient is lowered by uncouplers or respiratory inhibitors showing that, as in animal tissues, it reflects the energization of the mitochondria. (d) In the dark, the stromal ATP/ADP is lower than in the light, and appears to be maintained, at least in part, by import from the cytosol. (e) The cytosolic ATP/ADP, however, actually decreases in the light. This contradicts the widespread assumption, that export of photosynthetically produced ATP from the chloroplast leads to an increase in the cytosolic ATP/ADP, which then inhibits oxidative phosphorylation in the mitochondria. (f) The mitochondrial ATP/ADP increases in the light, and the gradient between the cytosol and mitochondrial matrix falls. This is also difficult to understand in terms of an inhibition of oxidative phosphorylation in the light due to a lack of ADP in the cytosol. (g) The significance of the measured variations in the adenine nucleotide pools are discussed with respect to the diurnal carbohydrate metabolism in a leaf, and to the metabolic function of the chloroplast, the cytosol and the mitochondria.

2 Permanent address: Department of Biology, P.O. Box 1144, University of Wollongong, N.S.W. 2500, Australia.

1 Supported by the Deutsche Forschungsgemeinschaft.




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Copyright © 1982 by the American Society of Plant Biologists