Phosphate Deficiency in Maize. IV. Changes in Amounts of Sucrose Phosphate Synthase during the Course of Phosphate Deprivation

摘要

With low-P treatment of maize, the level of sucrose phosphate synthase (SPS) protein decreased to 15%of the control, while the“Vmax”activity stayed relatively high (100–80%of the control) and the substrate limiting activity increased about 2 fold in the leaves. These results suggest that leaf phosphate status has dual effects on the amount of SPS protein and the activation state o