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The contribution of fructose 2,6‐bisphosphate to the regulation of sucrose synthesis during photosynthesis
Author(s) -
Stitt M.,
Gerhardt R.,
Wilke I.,
Heldt H. W.
Publication year - 1987
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1987.tb04304.x
Subject(s) - sucrose , fructose , photosynthesis , fructose 2,6 bisphosphate , fructose 1,6 bisphosphatase , sucrose phosphate synthase , biochemistry , chloroplast , cytosol , chemistry , starch , carbon fixation , sugar phosphates , sugar , carbohydrate , spinach , phosphate , sucrose synthase , metabolism , enzyme , invertase , glycolysis , phosphofructokinase , gene
This review discusses (a) how the concentration of fructose 2,6‐bisphosphate is controlled in spinach leaves, (b) how fructose 2,6‐bisphosphate and cytosolic metabolites control the cytosolic fructose‐1,6‐bisphosphatase (EC 3.1.3.11), and (c) how the activities of the fructose‐1,6‐bisphosphatase and of sucrose phosphate synthase (EC 2.3.1.14) are coordinated. These features provide the elements of a fine control network that regulates sucrose synthesis during photosynthesis. The rate of sucrose synthesis is coordinated with the supply of photosynthate, so that concentrations of metabolites and phosphate are maintained at a level in the chloroplast which allows rapid CO 2 fixation. The rate of sucrose synthesis can also be modified to alter the amount of photosynthate that remains in the chloroplast for conversion to starch.