Abstract
In grapevines, as in other plants, sucrose and its constituents glucose and fructose are fundamentally important and carry out a multitude of roles. The aims of this review are three-fold. First, to provide a summary of the metabolism and transport of sucrose in grapevines, together with new insights and interpretations. Second, to stress the importance of considering the compartmentation of metabolism. Third, to outline the key role of acid invertase in osmoregulation associated with sucrose metabolism and transport in plants.
Highlights
Sucrose and its constituents, glucose and fructose, account for the bulk of the nonstructural carbohydrate content of many ripe fruits, including grapes
Zhang et al [76] characterised VvSWEET10 in grape pericarp: transcript abundance increased at veraison, it was located in the plasma membrane, transported glucose and fructose, and transcripts were present in parenchyma and vasculature
An impressive understanding of sugar metabolism in grapevines has been achieved by the dedicated work of a large number of researchers over a period spanning three centuries
Summary
Glucose and fructose, account for the bulk of the nonstructural carbohydrate content of many ripe fruits, including grapes. These sugars have a number of functions, which include: providing a metabolic substrate, acting as a carbon store, osmoregulation, transport, signalling and, in their wild ancestors, enticing animals to disperse the fruits/seeds [1]. The transport and metabolism of sucrose in grapevines is reviewed. The importance of considering the compartmentation of metabolism is stressed. The key role of acid invertase in osmoregulation associated with the transport and metabolism of sucrose is examined
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