Plant Physiology 75:542-547 (1984)
© 1984 American Society of Plant Biologists
Articles
Measurement of Subcellular Metabolite Levels in Leaves by Fractionation of Freeze-Stopped Material in Nonaqueous Media 1
Richard Gerhardt and
Hans W. Heldt
Lehrstuhl Für Biochemie der Pflanze, Universität Göttingen, Untere Karspüle 2, 3400 Göttingen, Federal Republic of Germany
This paper describes a technique for measuring the in vivo metabolite levels in the chloroplast stroma, the cytosol, and the vacuole of spinach (Spinacia oleracea U.S.A. hybrid 424) leaves. Spinach leaves were freeze stopped and the frozen tissue was ground and lyophilized. The dry material was homogenized by sonication in a mixture of carbon tetrachloride and heptane, and fractionated by density gradient centrifugation. Measurements of the activity of marker enzymes in various subcellular compartments show the chloroplastic material mainly appearing in the lightest fractions and the cytosolic material in the middle of the gradient, whereas most of the vacuolar material is found in the heaviest fraction. Using the measured distributions of metabolites and of marker enzymes in each fraction of the gradient, the subcellular distribution of the metabolite can be calculated.
As a first application, the new fractionation technique was used to investigate the subcellular contents of malate and sucrose in spinach leaves. The results show striking diurnal changes of sucrose and malate, with both substances primarily located in the vacuolar compartment. About three times more malate is present at the end of the day than at the end of the night. The sucrose content in the vacuole falls from a maximum of 45 millimolars at the end of the day to an almost undetectable value of approximately 1 millimolar at the end of the night.
1 Supported by the Deutsche Forschungsgemeinschaft.
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