Changes in the activity of sucrose-synthesizing enzymes in developing leaves of Lolium temulentum

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Sucrose phosphate synthetase was assayed throughout the development of the fourth leaf of Lolium temulentum L. Activity was maximal at the time of ligule formation and subsequently declined. Specific sucrose phosphate phosphatase was always present in excess although sucrose synthetase activity was considerably lower and remained unchanged. Maximum levels of sucrose phosphate synthetase activity are comparable in magnitude to levels of photosynthetic activity in mature grass leaves and with estimates of sucrose transport from the flag leaf into developing grass seeds.