In this article:
The concentrations of glycolytic intermediates, acid components and adenosine nucleotides were determined at half-weekly intervals during development and ripening of grape berries.
Based on distinctive non-equilibrium conditions and enzymic activities which are not controlled by substrate availability at the levels of phosphoenolpyruvate / pyruvate and fructose-6-phosphate / fructose diphosphate it is concluded that these two sites represent the major control points in the reaction sequences between sugar and acid pools in this fruit.
Control of Glycolysis in Ripening Berries of Vitis vinifera
1977, Phytochemistry, vol 16, issue 8, pages 1171-1175
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