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Excision of spinach (Spinacia oleracea L.) leaves had no effect on photosynthetic rates, but altered normal carbon partitioning to favor increased formation of starch and decreased formation of sucrose. The changes were evident within 2 hours after excision. Concurrently, leaf fructose-2,6-bisphosphate content increased about 5-fold (from 0.1 to 0.5 nanomoles per gram fresh weight). The activities of sucrose-P synthase and cytoplasmic fructose 1,6-bisphosphatase in leaf extracts remained constant during the time period tested. It is postulated that the rise in fructose 2,6-bisphosphate was responsible for the change in carbon partitioning.

Evidence for Control of Carbon Partitioning by Fructose 2,6-Bisphosphate in Spinach Leaves