Abstract
Summary In sugar beet plants, activities of both, sucrose synthase (SS, EC 2.4.1.13) and sucrose phosphate synthase (SPS, EC 2.4.1.14), increase with plant age, in beet tissue as well as in petioles and to a lesser extent in leaves. In beets, maximum activity of SS was 33.5 μmol/mg protein · h, and of SPS 18.1 μmol/mg protein · h. Activity of SPS is significantly higher in the core than in the peripheral parts of the beet. Cell suspensions exhibited rather low activities of SPS. The data shown for beet tissue are correlated with cell growth and sucrose concentration. Somewhat in contrast with earlier reports this indicates the significance of both enzymes in the regulation of sucrose storage: SS contributes to an increase of the sink capacity, and SPS provides the steady increase of sucrose content in the growing beet.
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