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Metabolism and Enzymology

Light/Dark Modulation of Enzyme Activity in Developing Barley Leaves ¹

Department of Biological Sciences, University of Illinois at Chicago, Box 4348, Chicago, Illinois 60680

Light/dark modulation of the ribulose-5-phosphate kinase, NADP⁺-glyceraldehyde-3-phosphate dehydrogenase, and fructose- 1,6-bisphosphatase activity was measured in the developing primary leaf of barley (Hordeum vulgare L.) seedlings. Ribulose-5-phosphate kinase and NADP⁺ -glyceraldehyde-3-phosphate dehydrogenase were fully light activated even at the earliest developmental stage sampled. In contrast, light modulation of fructose- 1,6-bisphosphatase exhibited a complex response to leaf developmental status. Light stimulation of fructose- 1,6-bisphosphatase activity (measured at pH 8.0) increased progressively during leaf development. On the other hand, acid fructose- 1,6-bisphosphatase activity (measured at pH 6.0) was inhibited by light, and this light inhibition was greater in the base of the leaf than in the tip of the leaf.

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				P. Thompson, C. G. Bowsher, and A. K. Tobin Heterogeneity of Mitochondrial Protein Biogenesis during Primary Leaf Development in Barley Plant Physiology, November 1, 1998; 118(3): 1089 - 1099. [Abstract] [Full Text]