All plant carbohydrates are derived from photosynthesis, the process during which CO2 from the atmosphere is fixed and converted to carbohydrates with energy from light. The carbohydrates that are generated during photosynthesis form the building blocks for all other carbon-based compounds in the cell, including the phenolic compounds. The precursors for plant phenolic compounds are derived from two catabolic processes in the plant cell: glycolysis and the pentose phosphate pathway. For detailed background on carbohydrate metabolism, please refer to Dennis and Blakeley (2000) or Plaxton and McManus (2006).
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