Plant Physiol.
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Plant Physiology 82:503-510 (1986)
© 1986 American Society of Plant Biologists

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Articles

Enzymes of Glucose Oxidation in Leaf Tissues 1

The Distribution of the Enzymes of Glycolysis and the Oxidative Pentose Phosphate Pathway between Epidermal and Mesophyll Tissues of C3-Plants and Epidermal, Mesophyll, and Bundle Sheath Tissues of C4-Plants

Eve Syrkin Wurtele2 and Basil J. Nikolau2

Department of Biochemistry and Biophysics, University of California, Davis, California 95616

The distribution of the glycolytic enzymes, phosphofructokinase, aldolase, triosephosphate isomerase, phosphoglycerate kinase, pyruvate kinase, and the oxidative pentose phosphate pathway enzymes, glucose 6-phosphate dehydrogenase and 6-phosphogluconate dehydrogenase, was determined in the leaf tissues of two C3-plants, pea and leek, and two C4-plants, maize and sorghum. All enzymes examined were found in epidermal tissue. In pea, maize, and sorghum leaves, the specific activities of these enzymes were usually higher in the nonphotosynthetic epidermal tissue than in the photosynthetic tissues of the leaves. In leek leaves, which were etiolated, specific activities were similar in both epidermal and mesophyll tissue. The distribution of the rate limiting enzymes of glycolysis and the oxidative pentose phosphate pathways probably reflects the capacity of each tissue to generate NADH, NADPH, and ATP from the oxidation of glucose. This capacity appears to be greater in leaf tissues unable to generate reducing equivalents and ATP by photosynthesis, that is, in epidermal tissues and etiolated mesophyll tissue.

2 Present address: NPI, 417 Wakara Way, Salt Lake City, UT 84108.

1 Supported in part by National Science Foundation Grant PCM79-03976 to Dr. P. K. Stumpf, National Science Foundation Grant PCM-81-04497 and United States Public Health Service Grant GM-05301-25 to Dr. E. E. Conn.






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ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1986 by the American Society of Plant Biologists