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Plant and Cell Physiology, 1993, Vol. 34, No. 5 767-770
© 1993

Short Communication

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

Hideaki Usuda and Kousuke Shimogawara

Laboratory of Chemistry, Faculty of Medicine, Teikyo University Ohtsuka, Hachioji, Tokyo, 192-03 Japan

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 of SPS.

(Received January 20, 1992; Accepted April 14, 1993)
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