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The regulation of photosynthetic sucrose synthesis and partitioning is reviewed with particular emphasis on the role of fructose‐2,6‐bisphosphate and sucrose phosphate synthase. It is concluded that a hierachy of regulatory mechanisms exist, which allows partitioning to be changed without this necessarily leading to a reduction in the rate of photosynthesis. Nevertheless, experimental conditions can be defined in which photosynthesis is limited by the rate of end‐product synthesis. These systems can be used to screen for genetic mutants or specific inhibitors, and to investigate a shift in sink demand or environmental factors that specifically act on carbon partitioning and/or the rate of endproduct synthesis.
Stitt et al. (Fri,) studied this question.