The contribution of fructose 2,6‐bisphosphate to the regulation of sucrose synthesis during photosynthesis

Physiologia Plantarum - Tập 69 Số 2 - Trang 377-386 - 1987
Mark Stitt1, Richard Gerhardt1, Ingo Wilke1, Hans‐Walter Heldt1
1Institut für Biochemie der Pflanze, Untere Karspüle 2, 3400 Göttingen, FRG

Tóm tắt

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 CO2 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.

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Tài liệu tham khảo

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Physiologia Plantarum

Tập 69 Số 2

377-386

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