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THE PLANT CELL, Vol 7, Issue 9 1369-1385, Copyright © 1995 by American Society of Plant Biologists

RESEARCH ARTICLES

Sink- and Vascular-Associated Sucrose Synthase Functions Are Encoded by Different Gene Classes in Potato

H. Fu and W. D. Park
Department of Biochemistry and Biophysics, Texas A & M University, College Station, Texas 77843-2128

Two differentially regulated classes of sucrose synthase genes, Sus3 and Sus4, were identified in potato. They cannot be classified as Sus1 and Sus2 types based on sequence homology and appear to have evolved after the divergence of the major families of dicotyledonous plants but before the divergence of tomato and potato. The potato sucrose synthase clones Sus3-65 and Sus4-16 share an 87% nucleotide identity in the coding regions, and both are interrupted by 13 introns, including a long leader intron. Potato Sus3 genes are expressed at the highest levels in stems and roots and appear to provide the vascular function of sucrose synthase. In contrast, Sus4 genes are expressed primarily in the storage and vascular tissue of tubers and appear to facilitate sink function. The genes are differentially regulated in root tips, with Sus3 expressed at high levels in the cell division zone and Sus4 expressed at high levels in the meristem and cap.


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