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Glyceraldehyde 3-Phosphate Dehydrogenases and Glyoxylate Reductase: II. Far Red Light-Dependent Development of Glyceraldehyde 3-Phosphate Dehydrogenase Isozyme Activities in Sinapis alba Cotyledons
R. Cerff and P. H. Quail
Vol. 54, No. 1 (Jul., 1974), pp. 100-104
Published by: American Society of Plant Biologists (ASPB)
Stable URL: http://www.jstor.org/stable/4263674
Page Count: 5
You can always find the topics here!Topics: Enzymes, Cotyledons, Dehydrogenases, Sulfates, Seedlings, Quaternary ammonium compounds, Chloroplasts, Plants, Chromatography, Spinach
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Ammonium sulfate chromatography has been employed to separate glyceraldehyde 3-phosphate dehydrogenases (GPD) of Sinapis alba cotyledons of various developmental stages. Cotyledons of dark-grown seedlings possess one major NAD-specific enzyme designated NAD-GPD I. Irradiation with continuous far red light leads to a strong increase in NADP-GPD activity and to the formation of a second NAD activity designated NAD-GPD II. These two activities occur in a constant ratio during cotyledon development, and they are eluted together in ammonium sulfate chromatography. In a later stage of cotyledon development the light-dependent increase in NAD-GPD II is matched by an equivalent decrease in NAD-GPD I. These data suggest that the chloroplast marker enzyme NADP-GPD (EC 188.8.131.52) also has NAD activity and that the light-dependent formation of this bifunctional enzyme is correlated with activity changes of the NAD-GPD of cytoplasmic glycolysis (EC 184.108.40.206).
Plant Physiology © 1974 American Society of Plant Biologists (ASPB)